• Thumbnail for Subdwarf
    of blue-white subdwarfs, making two distinct categories: Cool subdwarfs Hot subdwarfs Like ordinary main-sequence stars, cool subdwarfs (of spectral types G...
    18 KB (2,103 words) - 01:30, 6 December 2024
  • Thumbnail for Subdwarf B star
    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...
    14 KB (1,569 words) - 15:05, 5 March 2025
  • Thumbnail for Subdwarf O star
    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...
    5 KB (570 words) - 04:26, 4 February 2025
  • Thumbnail for Brown dwarf
    Brown dwarf (redirect from Brown subdwarf)
    indicating low surface gravity, subdwarfs and unresolved binaries. The prefix sd stands for subdwarf and only includes cool subdwarfs. This prefix indicates a...
    166 KB (18,216 words) - 00:41, 12 June 2025
  • Thumbnail for Blue 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...
    11 KB (1,486 words) - 01:16, 3 March 2025
  • L dwarf (section Subdwarfs)
    subdwarfs to have blue near-infrared colors. 2MASS J0532+8246 was the first L-type subdwarf discovered. The prefix sd, esd and usd indicate subdwarfs...
    35 KB (3,790 words) - 18:55, 2 May 2025
  • Thumbnail for Stellar classification
    of low surface gravity, subdwarfs and unresolved binaries. The prefix sd stands for subdwarf and only includes cool subdwarfs. This prefix indicates a...
    107 KB (11,666 words) - 15:34, 15 June 2025
  • Thumbnail for O-type star
    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...
    31 KB (3,345 words) - 20:39, 19 March 2025
  • Thumbnail for WISEA 1810−1010
    WISEA 1810−1010 (category Subdwarfs)
    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...
    12 KB (1,253 words) - 19:46, 11 May 2025
  • Thumbnail for Asteroseismology
    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...
    18 KB (2,290 words) - 07:53, 18 March 2025
  • Thumbnail for Dwarf star
    Chandrasekhar limit Dwarf planet Stellar classification Sub-brown dwarf Subdwarf Ultra-cool dwarf Brown, Laurie M.; Pais, Abraham; Pippard, A.B., eds. (1995)...
    5 KB (577 words) - 19:34, 24 April 2025
  • 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...
    3 KB (327 words) - 13:22, 23 March 2025
  • Thumbnail for Metallicity
    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...
    42 KB (4,790 words) - 23:40, 29 May 2025
  • Thumbnail for Backyard Worlds
    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...
    53 KB (5,360 words) - 19:47, 8 June 2025
  • Thumbnail for Solar System
    Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Giant Blue Red Yellow Bright giant Supergiant Blue Red Yellow Hypergiant Yellow Carbon...
    224 KB (21,988 words) - 14:05, 14 June 2025
  • Thumbnail for HD 49798
    HD 49798 (category O-type subdwarfs)
    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...
    9 KB (853 words) - 01:32, 13 April 2025
  • Thumbnail for Variable star
    amplitudes. 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...
    51 KB (6,578 words) - 23:22, 23 May 2025
  • Kapteyn's Star (category M-type subdwarfs)
    Kapteyn's Star is a class M1 red subdwarf about 12.83 light-years from Earth in the southern constellation Pictor; it is the closest halo star to the Solar...
    24 KB (2,189 words) - 11:36, 16 May 2025
  • Thumbnail for Red supergiant
    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...
    34 KB (4,290 words) - 13:20, 2 May 2025
  • Thumbnail for Red 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...
    28 KB (3,497 words) - 14:13, 4 April 2025
  • Thumbnail for Sun
    Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Giant Blue Red Yellow Bright giant Supergiant Blue Red Yellow Hypergiant Yellow Carbon...
    173 KB (19,376 words) - 16:09, 14 June 2025
  • 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...
    7 KB (881 words) - 13:21, 9 December 2024
  • Thumbnail for NGC 2346
    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...
    6 KB (658 words) - 00:14, 2 September 2024
  • Thumbnail for Star
    Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Giant Blue Red Yellow Bright giant Supergiant Blue Red Yellow Hypergiant Yellow Carbon...
    147 KB (16,423 words) - 20:22, 31 May 2025
  • Thumbnail for NY Virginis
    NY Virginis (category B-type subdwarfs)
    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...
    12 KB (1,066 words) - 00:43, 8 June 2025
  • Thumbnail for 2MASS J05325346+8246465
    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...
    11 KB (1,012 words) - 04:10, 30 May 2025
  • Thumbnail for Hypergiant
    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...
    40 KB (4,553 words) - 11:29, 7 June 2025
  • Kepler-70 (category B-type subdwarfs)
    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...
    15 KB (1,426 words) - 19:02, 16 May 2025
  • hypothetical stage in red dwarf interstellar evolution O-type subdwarf B-type subdwarf Blue star (disambiguation) Blue giant (disambiguation) This disambiguation...
    537 bytes (101 words) - 06:56, 16 April 2025
  • Thumbnail for UNCOVER-BD-1
    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...
    6 KB (503 words) - 14:29, 20 October 2024