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Star of luminosity class VI under the Yerkes spectral classification system
of blue-white subdwarfs, making two distinct categories: Cool subdwarfs Hot subdwarfs Like ordinary main-sequence stars, cool subdwarfs (of spectral types G
Subdwarf
Topics referred to by the same term
Blue subdwarf may refer to: Subdwarf O star, subdwarf stars ranging above 30,000 K Subdwarf B star, subdwarf stars ranging from 10,000 to 30,000 K Blue
Blue_subdwarf
Subdwarf star with spectral type B
A B-type subdwarf (sdB) is a kind of subdwarf star with spectral type B. They differ from the typical subdwarf by being much hotter and brighter. They
Subdwarf_B_star
Subdwarf star with spectral type O
A subdwarf O star (sdO) is a type of hot, but low-mass star. O-type subdwarfs are much dimmer than regular O-type main-sequence stars, but with a brightness
Subdwarf_O_star
Substellar object
indicating low surface gravity, subdwarfs and unresolved binaries. The prefix sd stands for subdwarf and only includes cool subdwarfs. This prefix indicates a
Brown_dwarf
Stellar classification
Centauri B (K1 V), Epsilon Indi (K5 V) and Epsilon Eridani (K2 V). There are subdwarf stars, that is stars of luminosity class VI, of spectral class K. These
K-type_main-sequence_star
Classification of stars based on spectral properties
of low surface gravity, subdwarfs and unresolved binaries. The prefix sd stands for subdwarf and only includes cool subdwarfs. This prefix indicates a
Stellar_classification
Hot, giant star of early spectral type
Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright
Blue_giant
Stellar classification
There are subdwarf stars, that is stars of luminosity class VI, of spectral class F although these are much less common than G, K, and M subdwarfs. These
F-type_main-sequence_star
Stellar classification
slowly from its high initial temperature as the nebula fades. There are subdwarf stars, that is stars of luminosity class VI, of spectral class G. These
G-type_main-sequence_star
Astronomical objects colder than red dwarfs
Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright
L_dwarf
Binary star system in the constellation Puppis
the brightest known O class subdwarf stars. HD 49798 was discovered in 1964 to be a rare hydrogen-deficient O class subdwarf, and was the brightest known
HD_49798
NASA-funded citizen science project
December 2017, seven new brown dwarfs were confirmed, as well as two cool subdwarfs. The spectral types of the new brown dwarfs were T0, T2.8, T5, T6, T6
Backyard_Worlds
Rare star with tremendous luminosity and high rates of mass loss by stellar winds
Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright
Hypergiant
Star whose brightness fluctuates, as seen from Earth
strip. The prototype of this rare class is V361 Hydrae, a 15th magnitude subdwarf B star. They pulsate with periods of a few minutes and may simultaneous
Variable_star
Study of oscillations in stars
hours. Both classes of oscillators contain only slowly rotating stars. Subdwarf B (sdB) stars are in essence the cores of core-helium burning giants who
Asteroseismology
Type of star larger than main-sequence but smaller than a giant
Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright
Subgiant
Subdwarf star in the constellation Pictor
Kapteyn's Star is a class M1 red subdwarf about 12.83 light-years (3.93 parsecs) from Earth in the southern constellation Pictor; it is the closest halo
Kapteyn's_Star
Dim, low mass stars on the main sequence
Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright
Red_dwarf
Triple star system in the constellation Cygnus
1130 is a nearby pre-cataclysmic triple star system consisting of a cold subdwarf of spectral type sdM3 (A), an ultramassive white dwarf (B) and a cold brown
Wolf_1130
Light from the stars
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Starlight
Relative abundance of heavy elements in a star or other astronomical object
ISSN 0067-0049. Sandage, A.R.; Eggen, O.J. (1959-06-01). "On the existence of subdwarfs in the (MBol, log Te)-diagram". Monthly Notices of the Royal Astronomical
Metallicity
Type of large cool star
Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright
Red_giant
Remains of a galaxy merger in the Milky Way
Zbigniew (2 Nov 2024). "New Cold Subdwarf Discoveries from Backyard Worlds and a Metallicity Classification System for T Subdwarfs". The Astrophysical Journal
Gaia_Sausage
Hypervelocity O-type subdwarf in the halo of the Milky Way Galaxy
US 708 is a hyper-velocity class O subdwarf in Ursa Major, in the halo of the Milky Way Galaxy. One of the fastest-moving stars in the galaxy, the star
US_708
Brown dwarf or exoplanet with atmospheric methane
classification system for T subdwarfs, which allows the classification into mild subdwarfs (d/sdT), subdwarfs (sdT) and extreme subdwarfs (esdT). The signature
T_dwarf
Star in the constellation Hydra
V361 Hydrae is a hot subdwarf variable star, the prototype of a class of pulsating variables. It is very approximately 2,200 parsecs away in the constellation
V361_Hydrae
Stars with a supergiant luminosity class with a spectral type of K or M
Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright
Red_supergiant
Topics referred to by the same term
Dakota, a US state Eswatini (formerly Swaziland; SD on vehicle plates) Subdwarf, a class of star Surface detector, of cosmic rays at the Pierre Auger Observatory
SD
Substellar object in Serpens constellation
metallicity. Together with WISEA 0414−5854 it is the first discovered extreme subdwarf (esd) of spectral type T. Lodieu et al. describe WISEA 1810-1010 as a water
WISEA_1810−1010
Type of star, larger and brighter than the Sun
Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright
Giant_star
Astronomical object without the mass to sustain hydrogen fusion
S. Geier, et al - Discovery of a Close Substellar Companion to the Hot Subdwarf Star HD 149382 (2009) Boss, A. P.; Basri, Gibor; Kumar, Shiv S.; Liebert
Substellar_object
Star of relatively small size and low luminosity
Chandrasekhar limit Dwarf planet Stellar classification Sub-brown dwarf Subdwarf Ultra-cool dwarf "Glossary term: Dwarf Star". IAU Office of Astrononomy
Dwarf_star
Type of star that is massive and luminous
Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright
Supergiant
Stellar classification
than about 200M☉. Other stars in the same temperature range include rare subdwarf O-type (sdO) stars, the central stars of planetary nebulae (CSPNe), and
O-type_star
Star at the centre of the Solar System
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Sun
Star in the constellation Cygnus
viewing it requires a telescope with an aperture of 40 cm (20 in) or more. A subdwarf B star, Kepler-70 passed through the red giant stage some 18.4 million
Kepler-70
Planetary nebula in the constellation Andromeda
the nebula is 3,080 years. The central star of the planetary nebula is a subdwarf O star with a spectral type of sdO. The best fit model for this star gives
NGC_7662
Topics referred to by the same term
hypothetical stage in red dwarf interstellar evolution O-type subdwarf B-type subdwarf Blue star (disambiguation) Blue giant (disambiguation) This disambiguation
Blue_dwarf
Binary star system
for the spectral class G5Vb, although it is frequently described as a subdwarf, meaning it has a luminosity below that expected for a G5 main sequence
Mu_Cassiopeiae
Gas and dust surrounding a newly formed star
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Protoplanetary_disk
Structure formed by diffuse material in orbital motion around a massive central body
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Accretion_disk
Main-sequence star of spectral type O
Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright
O-type_main-sequence_star
Distant brown dwarf
member. This team also found that it is likely a subdwarf and comparison with the extreme subdwarf WISEA 1810−1010 produced a better fit to the widened
UNCOVER-BD-1
Planetary system consisting of the Sun and objects orbiting it
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Solar_System
Binary star in the constellation Virgo
about 1,940 light-years away. The primary belongs to the rare class of subdwarf B stars, being former red giants with their hydrogen envelope completely
NY_Virginis
Hypothetical early-universe star with a black hole core
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Quasi-star
Star in the constellation Camelopardalis
in the galactic halo of the Milky Way, and the first known substellar subdwarf star. It was discovered by Adam Burgasser et al. in 2003 from Two Micron
2MASS_J05325346+8246465
Hypothesized alternative to a black hole
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Gravastar
Methods for estimating the age of a star
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Stellar_age_estimation
Type of neutron star with beams of radiation
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Pulsar
Classification in astronomy
Related links Compact star Quark star Exotic star Extreme helium star Subdwarf B star Helium planet In binary systems Nova Remnant List Dwarf nova Micronova
Compact_object
Star in the constellation Eridanus
per year. This is an M-type subdwarf star with a stellar classification of d/sdM2. It was one of the first three subdwarfs to be definitively identified
GJ_1062
Unit of time
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Galactic_year
Theoretical stellar remnant
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Black_dwarf
Changed position of star vs background
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Stellar_parallax
Type of luminous supergiant star
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Post-AGB_star
Type of interstellar cloud
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Molecular_cloud
Christian (30 May 2023). "Timing the X-ray pulsating companion of the hot subdwarf HD 49798 with NICER". Monthly Notices of the Royal Astronomical Society
List_of_smallest_known_stars
Stellar core remnant
Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright
White_dwarf
Hot, luminous star with a spectral type of A9 or earlier
Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright
Blue_supergiant
Low-mass hypervelocity star
from the sun and its spectrum is sdL1, with sd noting that it is a cool subdwarf. The star has a high tangential velocity of 524±33 km/s and a high radial
CWISE_J1249+3621
Stage of stellar evolution
; Fontaine, G.; Bono, G.; Brassard, P. (2011). "RAPIDLY PULSATING HOT SUBDWARFS IN ω CENTAURI: A NEW INSTABILITY STRIP ON THE EXTREME HORIZONTAL BRANCH
Horizontal_branch
Subdwarf
HE 1256−2738 is a subdwarf located approximately 1,000 light years away in the constellation Hydra, with a surface temperature of approximately 38,000 °C
HE_1256−2738
Hypothetical types of stars
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Exotic_star
Hypothetical astronomical object
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Planck_star
Brown dwarf in the constellation Libra
sample and was undetected in Palomar/WIRC. This already hinted at the subdwarf nature of this object. Subsequent observations with the Hubble Space Telescope
WISE_1534−1043
Star that has a supergiant luminosity class, with a spectral type of F or G
Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright
Yellow_supergiant
Feature of the Hertzsprung-Russell diagram
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Hertzsprung_gap
Changes to stars over their lifespans
asymptotic-giant-branch stars. These may result in extreme horizontal-branch stars (subdwarf B stars), hydrogen deficient post-asymptotic-giant-branch stars, variable
Stellar_evolution
Stellar classification distinguished by bright blue luminosity
Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright
B-type_main-sequence_star
Planet that is outside the Milky Way galaxy
extragalactic planet candidate was published in Nature in October 2021. The subdwarf star HD 134440, which is currently located in galactic halo and has extragalactic
Extragalactic_planet
Star's outer shell from which light is radiated
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Photosphere
Planetary nebula in the constellation Monoceros
The central star is a binary star consisting of an A-type subgiant and a subdwarf O star. The system, which has an orbital period of 16.00±0.03 days, is
NGC_2346
Eclipsing binary star in the constellation Virgo
in the constellation of Virgo. The system comprises an eclipsing B-type subdwarf star and red dwarf star. The two stars orbit each other every 0.116795
HW_Virginis
Black hole formed by a collapsed star
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Stellar_black_hole
Scatter plot of stars showing the relationship of luminosity to stellar classification
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Hertzsprung–Russell_diagram
Hypothetical class of star that develops from a red dwarf
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Blue_dwarf_(red-dwarf_stage)
Astronomical category of stars
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Iron_star
Astronomical objects of planetary size that did not form in orbit around a star
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Sub-brown_dwarf
Large self-illuminated object in space
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Star
Early stage in the process of star formation
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Protostar
System of two stars orbiting each other
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Binary_star
Process by which stars are named
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Stellar designations and names
Stellar_designations_and_names
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Lists_of_stars
Binary star system in the constellation Cygnus
post-common envelope binary star system that comprises two stars, a pulsating subdwarf B star and a small red dwarf star. It is located about 1,340 light-years
Kepler-451
Collapsed core of a massive star
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Neutron_star
Grouping of stars by similar metallicity
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Stellar_population
Type of star
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
OH/IR_star
largest stars Burgasser, Adam (2024). "Discovery of a Hypervelocity L Subdwarf at the Star/Brown Dwarf Mass Limit". The Astrophysical Journal Letters
List_of_coolest_stars
Topics referred to by the same term
Blue main-sequence star (disambiguation) Blue dwarf (disambiguation) Blue subdwarf (disambiguation) Blue Planet (disambiguation) Blue world (disambiguation)
Blue_star
Smallest known Hydrogen-Burning (Main Sequence) Star
for Survey (TMTS), leading to its TMTS designation. It consists of a hot subdwarf B (sdB) star (J0526B) and a carbon-oxygen white dwarf (CO WD) companion
TMTS_J0526+5934
Creation of chemical elements within stars
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Stellar_nucleosynthesis
Hypothetical compact star
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Q_star
Type of emission nebula created by dying red giants
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Planetary_nebula
Star in the constellation Ara
spectroscopic binary system with an orbital period of 176 days. The companion is a subdwarf O star with a mass similar to the Sun but only 61% of the Sun's radius
Iota_Arae
Star not gravitationally bound to any galaxy
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Intergalactic_star
Small number of stars that orbit each other
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Star_system
German astrophysicist (b. 1979)
titled Asteroseismological Studies of Long- and Short-Period Variable Subdwarf B Stars. Starting in 2006 Randall was a fellow at the European Southern
Suzanna_Randall
Isolated, small, and opaque nebula
Superluminous Hypernova Classification Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Hertzsprung gap Giant Blue Red Yellow Bright giant Supergiant
Bok_globule
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