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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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
White dwarf star in the constellation Draco
Valois, A. D. M.; Amaral, L. A. (30 November 2015). "New white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12". Monthly Notices
SDSS_J1240+6710
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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 by constellation
Lists_of_stars_by_constellation
Star with an overabundance of lead
(2013-09-21). "Discovery of extremely lead-rich subdwarfs: does heavy metal signal the formation of subdwarf B stars?". Monthly Notices of the Royal Astronomical
Lead_star
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
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 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
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
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
Star in the constellation Camelopardalis
in the galactic halo of the Milky Way, and the first known substellar subdwarf star. It was discovered from Two Micron All-Sky Survey data, and verified
2MASS_J05325346+8246465
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
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
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
Pattern of stars recognized on Earth's night sky
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
Asterism_(astronomy)
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
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
Hypothetical hybrid star type
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
Thorne–Żytkow_object
Supernova that ejects a large mass at unusually high velocity
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
Hypernova
largest stars Burgasser, Adam (2024). "Discovery of a Hypervelocity L Subdwarf at the Star/Brown Dwarf Mass Limit". arXiv:2407.08578 [Astrophysics]. Filippazzo
List_of_coolest_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
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
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)
Nebula in the constellation Hercules
to the offset of the central star. The central star is classified as a subdwarf O star with surface temperature of 8900 K. The bright rim of the planetary
Abell_39
Type of neutron star with a strong magnetic field
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
Magnetar
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
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
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
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
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
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
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
A-type_main-sequence_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
Visible star that is nearly aligned with Earth's axis of rotation
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
Pole_star
Natural physical entity in space
evolution Protostar Young stellar object Pre-main-sequence Main sequence Subdwarfs Subgiants Giants Red / Blue Bright giants Supergiants Red / Blue Hypergiants
Astronomical_object
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
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
List of star systems within 20–25 light-years
List_of_star_systems_within_20–25_light-years
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
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
Event wherein the Sun is obscured by the Moon
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_eclipse
Binary star system
KPD 1930+2752 is a binary star system including a subdwarf B star and a probable white dwarf with relatively high mass. Due to the nature of this astronomical
KPD_1930+2752
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
Mass of a star in astronomy
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_mass
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
Overview of the scientific field of astronomy
Orion variable T Tauri star FU Orionis star Herbig Ae/Be Luminosity class Subdwarf star Dwarf star Blue dwarf Red dwarf Subgiant Giant star Blue giant Red
Outline_of_astronomy
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
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
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
Astrophysical phenomenon
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
Supernova
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
Continuous band of stars that appears on plots of stellar color versus brightness
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
Main_sequence
Star in its early stage of evolution
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
Young_stellar_object
Topics referred to by the same term
spherical diameter, a diameter of a sphere of equivalent volume Extreme subdwarf, a type of star End-systolic dimension, the diameter across a ventricle
ESD
Stellar stream in the Milky Way Galaxy
role in creating the giant structures of the Milky Way galaxy. In 2024 a subdwarf of spectral type sdT4 was identified as a possible member of the Helmi
Helmi_stream
Flow of gas ejected from the upper atmosphere 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_wind
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
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
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
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
Brief thermal runaway nuclear fusion in the core of low-mass 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
Helium_flash
Subdwarf B star in the constellation Sextans
UY Sextantis is a blue-white subdwarf star, located in the constellation of Sextans. The star is classed as member of the V361 Hydrae type (or also called
UY_Sextantis
Star in the constellation Virgo
Preethi (2024-11-08). "New Cold Subdwarf Discoveries from Backyard Worlds and a Metallicity Classification System for T Subdwarfs". The Astrophysical Journal
HD_126053
Outermost layer of a star's atmosphere
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_corona
SUBDWARF
SUBDWARF
SUBDWARF
SUBDWARF
Boy/Male
Tamil
Courage
Female
English
Feminine form of French Charlot, CHARLOTTE means "man."
Girl/Female
Hindu
Satisfied, Love, Attachment or pleasure
Boy/Male
Tamil
Cloud, Water, Traveller
Biblical
removing a dissension
Boy/Male
Biblical
Who sets the people at liberty.
Girl/Female
Tamil
Wise, Very intelligent
Boy/Male
Hindu, Indian, Punjabi, Sikh, Traditional
One whose Life is Full of Elixir of Naam
Boy/Male
Gujarati, Hindu, Indian, Kannada, Marathi, Telugu
Giving Water
Boy/Male
Hindu, Indian, Sanskrit
Consisting of Bliss
SUBDWARF
SUBDWARF
SUBDWARF
SUBDWARF
SUBDWARF