Annual Review of Astronomy and Astrophysics, 2009 Hot subdwarf stars (sdBs, sdOs) are core helium-burning stars at the blue end of the horizontal branch or have evolved even beyond that stage. They are found in all Galactic stellar populations and are sufficiently common to account for the UV-upturn of early-type galaxies.
U. Heber
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Hot subdwarf stars in close-up view - III. Metal abundances of subdwarf B stars [PDF]
Astronomy & Astrophysics, 2012 Context: Hot subdwarf B stars (sdBs) are considered to be core helium-burning stars with very thin hydrogen envelopes situated on or near the extreme horizontal branch (EHB). The formation of sdBs is still unclear as well as the chemical composition of their atmospheres. The observed helium depletion is attributed to atmospheric diffusion.
S. Geier
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Mass distribution for single-lined hot subdwarf stars in LAMOST [PDF]
Astrophysical Journal, 2023 Masses for 664 single-lined hot subdwarf stars identified in LAMOST were calculated by comparing synthetic fluxes from spectral energy distribution with observed fluxes from a Virtual Observatory service.
Zhenxin Lei +6 more
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Hot subdwarf stars in close-up view - II. Rotational properties of single and wide binary subdwarf B stars [PDF]
Astronomy & Astrophysics, 2012 Subluminous B stars (sdBs) form the extremely hot end of the horizontal branch and are therefore related to the blue horizontal branch (BHB) stars. While the rotational properties of BHB stars have been investigated extensively, studies of sdB stars have concentrated on close binaries that are influenced by tidal interactions between their components ...
S. Geier, U. Heber
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The population of hot subdwarf stars studied with Gaia -- IV. Catalogues of hot subluminous stars based on Gaia EDR3 [PDF]
Astronomy & Astrophysics, 2022 In light of substantial new discoveries of hot subdwarfs by ongoing spectroscopic surveys and the availability of the Gaia mission Early Data Release 3 (EDR3), we compiled new releases of two catalogues of hot subluminous stars: The data release 3 (DR3 ...
R. Culpan +5 more
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A self-synthesized origin for heavy metals in hot subdwarf stars [PDF]
Astronomy & Astrophysics, 2023 A number of He-rich hot subdwarf stars present high abundances for trans-iron elements, such as Sr, Y, Zr, and Pb. Diffusion processes are important in hot subdwarf stars and it is generally believed that the high abundances of heavy elements in these ...
Tiara Battich +4 more
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Shell helium-burning hot subdwarf B stars as candidates for blue large-amplitude pulsators [PDF]
Astronomy & Astrophysics, 2022 Blue large-amplitude pulsators (BLAPs) are a newly discovered type of variable star. Their typical pulsation periods are on the order of a few tens of minutes, with relatively large amplitudes of 0.2-0.4 mag in optical bands, and their rates of period ...
Heran Xiong +9 more
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Discovery of extremely lead-rich subdwarfs: does heavy metal signal the formation of subdwarf B stars? [PDF]
, 2013 Hot subdwarfs represent a group of low-mass helium-burning stars formed through binarystar interactions and include some of the most chemically peculiar stars in the Galaxy.
N. Naslim +3 more
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The EC14026 Stars - Pulsating Hot Subdwarfs [PDF]
Symposium - International Astronomical Union, 1998 The Edinburgh-Cape Blue Object Survey (Stobie et al. 1997a) is a southern hemisphere survey to discover hot, blue stellar objects brighter than B=18 at galactic latitudes more than 30° from the galactic plane. The main categories of object detected are hot subdwarfs, white dwarfs, blue horizontal branch stars, apparently normal B stars, cataclysmic ...
C. Koen +3 more
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Hot subdwarf stars in close-up view IV. Helium abundances and the $^3$He isotopic anomaly of subdwarf B star [PDF]
Astronomy & Astrophysics, 2013 12 pages, A&A ...
S. Geier +7 more
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