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Star in the stage when it has not yet reached the main sequence
A pre-main-sequence star (also known as a PMS star and PMS object) is a star in the stage when it has not yet reached the main sequence. Earlier in its
Pre-main-sequence_star
Continuous band of stars that appears on plots of stellar color versus brightness
counters the star's collapse under gravity, maintaining the star in a state of hydrostatic equilibrium. The star's position on the main sequence is determined
Main_sequence
Stellar classification
A G-type main-sequence star is a main-sequence star of spectral type G. The spectral luminosity class is V. Such a star has about 0.9 to 1.1 solar masses
G-type_main-sequence_star
Stellar classification
A K-type main-sequence star is a main-sequence (core hydrogen-burning) star of spectral type K. The spectral luminosity class is V. These stars are intermediate
K-type_main-sequence_star
Stellar classification
An A-type main-sequence star is a main-sequence (core hydrogen burning) star of spectral type A. The spectral luminosity class is V. These stars have spectra
A-type_main-sequence_star
Main-sequence star of spectral type O
O-type main-sequence star is a main-sequence—core hydrogen-burning—star of spectral type O. The spectral luminosity class is V, although class O main sequence
O-type_main-sequence_star
Stellar classification
An F-type main-sequence star is a main-sequence, core-hydrogen-fusing star of spectral type F. The spectral luminosity class is V. They have from around
F-type_main-sequence_star
Stellar classification distinguished by bright blue luminosity
Hypergiants absolute magni- tude (MV) A B-type main-sequence star is a main-sequence (core hydrogen-burning) star of spectral type B. The spectral luminosity
B-type_main-sequence_star
Early stage in the process of star formation
infalling gas is depleted, leaving a pre-main-sequence star, which contracts to later become a main-sequence star at the onset of hydrogen fusion producing
Protostar
Class of young variable stars
in the pre-main-sequence phase of stellar evolution. It ends when a star of 0.5 M☉ or larger develops a radiative zone, or when a smaller star commences
T_Tauri_star
American Astronomer and NASA mission Principal Investigator
Peter; et al. (2020). "A planet within the debris disk around the pre-main-sequence star AU Microscopii". Nature. 582 (7813): 497–500. arXiv:2006.13248.
Peter_Plavchan
Path taken by pre-main-sequence stars in the Hertzsprung–Russell diagram
showed that the pre-main-sequence star can remain in radiative equilibrium throughout some period of its contraction to the main sequence. The Henyey track
Henyey_track
Triple star system in the constellation Scorpius
actually a triple star system consisting of two B-type stars and a pre-main-sequence star. The primary star is a Beta Cephei variable star with rapid brightness
Lambda_Scorpii
Topics referred to by the same term
monitoring of a pharmaceutical drug or device Pre-main-sequence star, a star that has not yet reached the main sequence Phelan-McDermid Syndrome, a rare genetic
PMS_(disambiguation)
Dim, low mass stars on the main sequence
least luminous, and coolest kind of star on the main sequence. Red dwarfs are by far the most common type of fusing star in the Milky Way, at least in the
Red_dwarf
Young stars of spectral types A and B
A Herbig Ae/Be star (HAeBe) is a pre-main-sequence star – a young (<10 Myr) star of spectral types A or B. These stars are still embedded in gas-dust
Herbig_Ae/Be_star
Narrative technique used in television and films
or chase scene following the gun barrel sequence and preceding the main title sequence. In horror films, pre-credit scenes often feature an early casualty
Cold_open
FU Orionis-type star in the constellation Orionis
of pre-main-sequence star, FU Orionis (FUor) and EX Lupi (EXor). Studies have revealed that V1647 Orionis is a young stellar object, presumably a pre-main
V1647_Orionis
Reflection nebula in Chamaeleon
constellation of Chamaeleon. The nebula is lit up by a massive pre-main sequence star called HD 97300 at a distance of ~630 light years. It can be found
IC_2631
Small reflection nebula
Beta Cassiopeiae. Its importance is linked to the presence of a pre-main sequence star known as V633 Cassiopeiae (LkHα 198), first identified in 1960.
VdB_1
Young sun-like star in the constellation Centaurus
J140747.93−394542.6 or simply J1407, is a young, 20-million-year-old pre-main-sequence star that underwent a series of extreme dimming events in April–June
V1400_Centauri
Pre-main-sequence star in the constellation Musca
age implies the star has not yet begun nuclear fusion at its core and thus is a pre-main-sequence star. It is a T Tauri variable star and its apparent
MP_Muscae
Star in the constellation Musca
a pre-main sequence star of spectral type B8 to A0 located 353 light-years (108 parsecs) from Earth in the southern constellation of Musca. The star is
HD_100546
Reflection nebula in the constellation Corona Australis
fan-shaped nebula opens from the star R Coronae Australis toward the star T CrA to the south-east. R CrA is a pre-main-sequence star in the Corona Australis molecular
NGC_6729
Changes to stars over their lifespans
accretion of gas and dust from the molecular cloud, becoming a pre-main-sequence star as it reaches its final mass. Further development is determined
Stellar_evolution
Exoplanet orbiting the young HD 95086
Myr A-class pre-main-sequence star HD 95086. It is roughly 5 times as massive as Jupiter and orbits about 70 AU away from the parent star. It was detected
HD_95086_b
Star in the constellation Scorpius
K2-33 is an extremely young pre-main-sequence star located about 453 light-years (139 pc) away from the Earth in the constellation of Scorpius. It is known
K2-33
Young Super-Neptune orbiting K2-33
205117205.01) is a very young super-Neptune exoplanet, orbiting the pre-main-sequence star K2-33. It was discovered by NASA's Kepler space telescope on its
K2-33b
Disked object that eclipsed V1400 Centauri
Circumsecondary and Circumplanetary Disks and a Candidate Eclipse of a Pre-Main Sequence Star in Sco-Cen. 219th AAS Meeting. Austin, Texas: American Astronomical
J1407b
Star with a protoplanetary disk around it
a YSO star with a protoplanetary disk around it, located in the Ophiuchus Molecular Cloud (ρ Oph Cld, 5 Oph Cld, Ophiuchus Dark Cloud), a star-forming
Elias_2-27
Construct in astrophysics
Hertzsprung-Russell diagram. Hayashi track Henyey track Pre-main-sequence star Protostar Stellar isochrone T Tauri star Stahler, S. W. (1983). "The Birthline for Low-Mass
Stellar_birthline
Star in the constellation Crux
which may be a pre-main sequence star 0.78 times the Sun's mass. With the assigned designation of β Crucis D, the X-ray emission from this star was detected
Mimosa_(star)
Star in the constellation Musca
YSES 1, also known as TYC 8998-760-1, is a pre-main-sequence star located 310 light years away from Earth in the constellation of Musca, with a mass 1
YSES_1
Pre-main-sequence star
the star's circumstellar disk. PDS 110 is a young star still approaching the main sequence. It has been classified as a T Tauri star, or as a pre-main sequence
PDS_110
Type of eruptive variable star
In stellar evolution, an FU Orionis star (also FU Orionis object, or FUor) is a pre–main-sequence star which displays an extreme change in magnitude and
FU_Orionis_star
Star in the constellation of Scorpius
PZ99 J160930.3−210459) is a pre-main-sequence star approximately 450 light-years away in the constellation of Scorpius. The star was identified as a member
1RXS_J160929.1−210524
Red supergiant star in the constellation Orion
The observations indicate the companion is likely a young F-type pre-main-sequence star with 1.6 times the mass of the Sun, which is larger than expected
Betelgeuse
Star in the constellation Carina
HD 95086, formally named Aiolos, is a pre-main-sequence star about 282 light-years (86 parsecs) away. Its surface temperature is 7,750±250 K. HD 95086
HD_95086
Gravitational process studied in astronomy
the end of their main sequence lifetime. Higher density regions of the interstellar medium form clouds, or diffuse nebulae, where star formation takes
Star_formation
Magnetic field generated inside a star
means, a star will gradually approach, but never quite reach, the state of zero rotation. A T Tauri star is a type of pre-main-sequence star that is being
Stellar_magnetic_field
Nebula
have determined that McNeil's Nebula appeared when V1647 Ori, a pre-main sequence star, experienced an outburst called a FU Orionis or EX Lupii type event
McNeil's_Nebula
Second brightest star in the southern constellation of Pictor
the star implies a young age of the system and led to debate about whether it had joined the main sequence or was still a pre–main sequence star However
Beta_Pictoris
Star in the constellation Columba
(8.4 pc), it would be the closest-known star less than 100 Myr old and the closest-known pre-main sequence star. However, its age was later determined
AP_Columbae
Star in the constellation Auriga
stellar parallax. This pre-main-sequence star has a stellar classification of A0Ve, matching an A-type main-sequence star with emission lines in the spectrum
AB_Aurigae
Star in constellation Taurus
HL Tauri (abbreviated HL Tau) is a young T Tauri star in the constellation Taurus, approximately 450 light-years (140 pc) from Earth in the Taurus Molecular
HL_Tauri
Young brown dwarf with a protoplanetary disk
millimeter wavelengths. IRAS 04414+2506 was first identified as a good pre-main sequence star with IRAS in 1994, resembling a class II disk. In 2004 it was identified
2MASS_J04442713+2512164
Young star in constellation Taurus
HD 283572 is a young T Tauri-type pre-main sequence star in the constellation of Taurus about 414 light years away, belonging to the Taurus Molecular Cloud
HD_283572
Star whose brightness fluctuates, as seen from Earth
dust, it stabilizes in mass and becomes a pre–main-sequence star that is contracting toward the main sequence. The luminosity of this object is derived
Variable_star
Binary star in the constellation Boötes
most likely coming from the companion star. This magnitude 9.60 component is a possible pre-main sequence star with a mass similar to the Sun. It is radiating
1_Boötis
Astronomical phenomenon
Planetary migration occurs when a planet or other body in orbit around a star interacts with a disk of gas or planetesimals, resulting in the alteration
Planetary_migration
Process of energy release of a contracting star or planet
that occurs when the surface of a star or a planet cools. The cooling causes the internal pressure to drop, and the star or planet shrinks as a result. This
Kelvin–Helmholtz_mechanism
Star system in the constellation Puppis
indicator of age in pre-main-sequence stars due to the lithium burning process. The evolutionary model of lithium depletion for the primary star corresponds to
WISPIT_1
Star in the constellation Centaurus
likely coming from the lower mass companion – it may even be a pre-main-sequence star. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos
HD_110073
Pre-main sequence star system in the constellation Dorado
AB Doradus is a pre-main-sequence quadruple star system in the constellation Dorado. The primary is a flare star that shows periodic increases in activity
AB_Doradus
Star system in the constellation Carina
the most likely model is a 2.5 M☉ 10,000 K star. An alternative model, a 0.5 M☉ 3,660 K pre-main sequence star is considered less likely as it conflicts
QZ_Carinae
Star in its early stage of evolution
denotes a star in its early stage of evolution. This class consists of two groups of objects: protostars and pre-main-sequence stars. A star forms by accumulation
Young_stellar_object
Star in the constellation Crux
brighter than expected for its temperature, so it is most likely a pre-main-sequence star. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos
Zeta_Crucis
Type of interstellar cloud
A molecular cloud—sometimes called a stellar nursery if star formation is occurring within—is a type of interstellar cloud of which the density and size
Molecular_cloud
1964 spy film by Guy Hamilton
technology and gadgets by Bond, an extensive pre-credits sequence that stood largely alone from the main plot, multiple foreign locales and tongue-in-cheek
Goldfinger_(film)
Layer of gases surrounding an astronomical body held by gravity
main-sequence stars may be particularly prone to atmospheric loss. The star will spend an extended period as a superluminous pre-main-sequence star,
Atmosphere
Star in the constellation Telescopium
brightest pre-main-sequence stars to Earth. In 1980, Denis Walter Coates et al. announced that the star, then known as HD 174429, is a variable star. It was
PZ_Telescopii
Pre-main-sequence star
EPIC 204278916 is a pre-main-sequence star, about five million years old with a spectral type of M1, implying a red dwarf. It is part of the Upper Scorpius
EPIC_204278916
Star in the constellation Ophiuchus
pre-main sequence star on the Herbig Ae/Be stage, or is already an evolved giant Be star, as it presents all the characteristics of a typical Be star
51_Ophiuchi
Region of a star
solar granulation. Low-mass main-sequence stars, such as red dwarfs below 0.35 solar masses, as well as pre-main sequence stars on the Hayashi track,
Convection_zone
Empirical function in astronomy
stars, and black holes, after some time of evolution away from the main sequence stars and after a certain amount of mass loss. Since there are not enough
Initial_mass_function
Isolated, small, and opaque nebula
relatively small dark nebulae containing dense cosmic dust and gas from which star formation may take place. Bok globules are found within H II regions, and
Bok_globule
Large self-illuminated object in space
lose over half their total mass while on the main sequence. The time a star spends on the main sequence depends primarily on the amount of fuel it has
Star
Binary star system in the constellation Monoceros
et al. (2001). "Eclipses by a Circumstellar Dust Feature in the Pre-main-Sequence Star KH 15D". The Astronomical Journal. 554 (2): L201–L204. arXiv:astro-ph/0105412
KH_15D
Star in the constellation Taurus
S. (2000), "Dynamical Masses of T Tauri Stars and Calibration of Pre–Main-Sequence Evolution", The Astrophysical Journal, 545 (2): 1034–1043, arXiv:astro-ph/0008370
BP_Tauri
Star in the constellation Taurus
brightness. The primary is a T Tauri variable, a type of irregular pre-main-sequence star. Its brightness has been observed to vary from a photovisual magnitude
FU_Tauri
Constellation in the northern celestial hemisphere
Arkharov, A.; Barsunova, O.; Tambovtseva, L. (2008). "The unusual pre-main-sequence star V718 Persei (HMW 15)". Astronomy and Astrophysics. 489 (3): 1233–1238
Perseus_(constellation)
Star formation process
or dust. It causes the collapse of interstellar gas clouds and subsequent star formation. It occurs when the internal gas pressure is not strong enough
Jeans_instability
Star located in Ophiuchus
RIK-210 is a star located in the constellation Ophiuchus. It is known for its mysterious dimming events. The dips are observed with stable period of 5
RIK-210
Variable star in the constellation Monoceros
spectral type is B8IIIe. This is a massive Herbig Ae/Be star, a type of pre-main-sequence star that is surrounded by an orbiting circumstellar disk of
R_Monocerotis
Star in the constellation Musca
YSES 2 is a young, Sun-like (K-type) star in the constellation of Musca. It is approximately 360 ly from Earth in the Scorpius-Centaurus Association. Its
YSES_2
References External links A-type main-sequence star In the Harvard spectral classification system, a class of main-sequence star having spectra dominated by
Glossary_of_astronomy
Overview of the scientific field of astronomy
main-sequence star B-type main-sequence star A-type main-sequence star F-type main-sequence star G-type main-sequence star K-type main-sequence star M-type
Outline_of_astronomy
Astronomical theory about the Solar System
Martin, E. L.; Rebolo, R.; Magazzu, A.; Pavlenko, Ya. V. (1994). "Pre-main sequence lithium burning". Astron. Astrophys. 282: 503–517. arXiv:astro-ph/9308047
Nebular_hypothesis
Type of interstellar cloud that obscures visible light
the Wayback Machine Kennicutt, Robert C.; Evans, Neal J. (2012-09-22). "Star Formation in the Milky Way and Nearby Galaxies". Annual Review of Astronomy
Dark_nebula
Protoplanetary disk in the constellation Cepheus
from Uruguay. IRAS 23077+6707 was first observed as a possible pre-main-sequence star in 1993 and in 2014 it was identified as a possible young stellar
Dracula's_Chivito
Star in the southern constellation Pavo
that the deuterium was burned through while Alpha Pavonis was a pre-main-sequence star. The system is likely to be a member of the Tucana-Horologium association
Alpha_Pavonis
Binary star system in the constellation of Taurus
GK Tauri is a young T Tauri-type pre-main sequence star in the constellation of Taurus about 421 light years away, belonging to the Taurus Molecular Cloud
GI_Tauri_and_GK_Tauri
Herbig-Haro objects in the constellation Vela
the star is cool as opposed to the jet and shock regions where temperatures reach thousands of degrees. Hayashi track HH 34 Pre-main-sequence star Protoplanetary
HH_46/47
Star in the constellation Chamaleon
spectral type of K7Ve, indicating that it is a late K-type star with emission lines and a main sequence luminosity class, although it has not yet reached this
CT_Chamaeleontis
temperature range for B-type main-sequence stars. Way, Z.; et al. (11 September 2020). "ASAS-SN Discovery of a Luminous Star undergoing a Deep Dimming Event"
List of stars that have unusual dimming periods
List_of_stars_that_have_unusual_dimming_periods
Star-forming regions in the constellation Cassiopeia
notable pre-main-sequence star known as MWC 1080. This Herbig Ae/Be star, of spectral class B0 (a blue and very hot star), is part of a multiple star system
Star-forming regions of Cassiopeia
Star-forming_regions_of_Cassiopeia
Star of relatively small size and low luminosity
A dwarf star is a star of relatively small size and low luminosity. All main-sequence stars are dwarf stars. The meaning of the word "dwarf" has been
Dwarf_star
Blue star with strong helium lines
helium main sequence, analogous to the main sequence formed by the more common hydrogen stars. Previously, a helium star was a synonym for a B-type star, but
Helium_star
Young binary star system in the constellation of Taurus
equivalent to 309 AU at the distance of HK Tauri. The primary is a pre-main sequence star with a mass of 0.44 M☉, while the secondary has a mass of 0.37 M☉
HK_Tauri
Stellar classification
main sequence. The coolest of them have initial masses of around 16 times the Sun. It is unclear what the upper limit to the mass of an O-type star would
O-type_star
T Tauri star in the constellation Hydra
of the closest regions of recent "fossil" star-formation to the Sun. TW Hydrae is a pre-main-sequence star that is approximately 80% the mass of and 111%
TW_Hydrae
Constellation in the Southern Celestial Hemisphere
year-old very young pre-main sequence star that has not settled down to a stable main sequence life stage, or a 260-million-year-old star that has begun to
Corvus_(constellation)
Type of hot, massive star
association so thus of early type".[dubious – discuss] O-type main-sequence star B-type main-sequence star Stellar kinematics M. Pantaleoni González (2021). "The
OB_star
American astromer and physicist
Harvard, Garnavich published results of a study of pre-main sequence star KH 15D. As a binary star system, the team concluded that anomalous changes in
Peter_Garnavich
Herbig–Haro object located in the Orion nebula
envelope of the star, giving rise to 0.3 parsec long molecular outflow. HH 46/47 Stellar evolution Hayashi track Pre-main-sequence star Skiff, B. A. (October
HH_34
Classification of stars based on spectral properties
dwarfs. The full spectral class for the Sun is then G2V, indicating a main-sequence star with a surface temperature around 5,800 K. Hertzsprung–Russell diagram
Stellar_classification
List of people involved in the production of media
shorter title sequence), though during the final years of its "Faces of the Heart" sequence from April 2003 to September 2004, the names of the main characters
Credits
Disk of dust and debris in orbit around a star
disk material to form planets. The nebula continues to orbit the pre-main-sequence star for a period of 1–20 million years until it is cleared out by radiation
Debris_disk
Young exoplanet orbiting the red dwarf TOI-1227
first identified as a pre-main-sequence star (PMS star) with the Gaia satellite. Without this prior identification as a PMS star the exoplanet signal of
TOI-1227_b
Star in the constellation Hydra
indicate it is a zero age main sequence star, or possibly even a pre-main sequence star. A strong flare event was observed on December 22, 1993, with an
LQ_Hydrae
travel, tourism, insurance
PRE MAIN-SEQUENCE-STAR
PRE MAIN-SEQUENCE-STAR
Boy/Male
Arabic, Hindu, Indian, Muslim, Sindhi
Cloud that Carries Rain; Prophet Name; Rain Clouds
Surname or Lastname
English, German, Dutch (De Mann), and Jewish (Ashkenazic)
English, German, Dutch (De Mann), and Jewish (Ashkenazic) : nickname for a fierce or strong man, or for a man contrasted with a boy, from Middle English, Middle High German, Middle Dutch man. In some cases it may have arisen as an occupational name for a servant, from the medieval use of the term to describe a person of inferior social status. The Jewish surname can be ornamental.English and German : from a Germanic personal name, found in Old English as Manna. This originated either as a byname or else as a short form of a compound name containing this element, such as Hermann.Jewish (Ashkenazic) : from the Yiddish male personal name Man (cognate with 1).Indian (Panjab) : Hindu (Jat) and Sikh name of unknown meaning.
Male
Hebrew
(×žÖ¸× Ö´×™) Pet form of Hebrew Menashsheh, MANI means "causing to forget" or "one who forgets." Compare with another form of Mani.
Male
German
German byname MANN means "a fierce strong man" or simply "man."
Male
Hindi/Indian
(मणि) Hindi name MANI means "jewel." Compare with another form of Mani.
Female
Swedish
Swedish contracted form of Latin Magdalena, MALIN means "of Magdala."
Boy/Male
Arabic, Muslim
Benefit
Girl/Female
Tamil
Anuloma | அநà¯à®²à¯‹à®®à®¾
Sequence
Anuloma | அநà¯à®²à¯‹à®®à®¾
Girl/Female
Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Telugu
Sequence
Boy/Male
Indian
Prem Swarup
Boy/Male
Indian, Sikh
Music; In-sequence
Surname or Lastname
Scottish and northern English
Scottish and northern English : topographic name for a dweller at the chief farm (or home farm) on an estate, Scottish mains, or a habitational name from any of the various minor places named with this word (originally a shortened form of domain, later associated with the adjective main ‘principal’).English and Scottish : variant of Main 1–4.
Surname or Lastname
English
English : variant spelling of Prue.
Girl/Female
Hindu, Indian
Beauty
Boy/Male
Indian, Sanskrit
Order; Sequence
Boy/Male
Muslim/Islamic
Cloud that carries rain
Male
French
French form of Roman Latin Marinus, MARIN means "of the sea."
Male
Scandinavian
Scandinavian form of Latin Petrus, PER means "rock, stone."
Girl/Female
Indian
Proper name, Cloud that carries rain
Boy/Male
Hindu, Indian, Kannada, Kerala, Tamil
Hero
PRE MAIN-SEQUENCE-STAR
PRE MAIN-SEQUENCE-STAR
PRE MAIN-SEQUENCE-STAR
PRE MAIN-SEQUENCE-STAR
PRE MAIN-SEQUENCE-STAR
PRE MAIN-SEQUENCE-STAR
PRE MAIN-SEQUENCE-STAR
v.
The chief or principal part; the main or most important thing.
n.
To reach; to attain to; to arrive at; as, to gain the top of a mountain; to gain a good harbor.
n.
A beautiful American bombycid moth (Eucronia maia).
n.
That which follows as a result; a sequence.
v.
principal duct or pipe, as distinguished from lesser ones; esp. (Engin.), a principal pipe leading to or from a reservoir; as, a fire main.
n.
Vanity; emptiness; -- now used only in the phrase in vain.
a.
Very; extremely; as, main heavy.
superl.
Destitute of forge or efficacy; effecting no purpose; fruitless; ineffectual; as, vain toil; a vain attempt.
n.
To come off winner or victor in; to be successful in; to obtain by competition; as, to gain a battle; to gain a case at law; to gain a prize.
n.
Simple succession, or the coming after in time, without asserting or implying causative energy; as, the reactions of chemical agents may be conceived as merely invariable sequences.
n.
Any spider crab of the genus Maia, or family Maiadae.
v. t.
To arm with mail.
v. i.
To have or receive advantage or profit; to acquire gain; to grow rich; to advance in interest, health, or happiness; to make progress; as, the sick man gains daily.
n.
All five cards, of a hand, in consecutive order as to value, but not necessarily of the same suit; when of one suit, it is called a sequence flush.
v. t.
To decree or announce as a sentence.
n.
The state of being sequent; succession; order of following; arrangement.
n.
A main-hamper.
prep.
Through; by means of; through the agency of; by; for; for each; as, per annum; per capita, by heads, or according to individuals; per curiam, by the court; per se, by itself, of itself. Per is also sometimes used with English words.
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