Mass Distribution for Single-lined Hot Subdwarf Stars in LAMOST [PDF]
The 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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A New Class of Roche Lobe–filling Hot Subdwarf Binaries [PDF]
Astrophysical Journal, 2020 We present the discovery of the second binary with a Roche lobe–filling hot subdwarf transferring mass to a white dwarf (WD) companion. This 56 minute binary was discovered using data from the Zwicky Transient Facility.
Thomas Kupfer +32 more
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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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The CHARA Array Interferometric Program on the Multiplicity of Classical Be Stars: New Detections and Orbits of Stripped Subdwarf Companions [PDF]
Astrophysical Journal, 2023 Rapid rotation and nonradial pulsations enable Be stars to build decretion disks, where the characteristic line emission forms. A major but unconstrained fraction of Be stars owe their rapid rotation to mass and angular momentum transfer in a binary. The
Robert Klement +10 more
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Revised Metallicity Classes for Low‐Mass Stars: Dwarfs (dM), Subdwarfs (sdM), Extreme Subdwarfs (esdM), and Ultrasubdwarfs (usdM) [PDF]
The Astrophysical Journal, 2007 The current classification system of M stars on the main sequence distinguishes three metallicity classes (dwarfs - dM, subdwarfs - sdM, and extreme subdwarfs - esdM). The spectroscopic definition of these classes is based on the relative strength of prominent CaH and TiO molecular absorption bands near 7000A, as quantified by three spectroscopic ...
Sébastien Lépine +2 more
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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
semanticscholar +1 more source
The Common Envelope Evolution Outcome—A Case Study on Hot Subdwarf B Stars [PDF]
Astrophysical Journal, 2022 Common envelope evolution (CEE) physics plays a fundamental role in the formation of binary systems, such as merging stellar gravitational wave sources, pulsar binaries, and Type Ia supernovae. A precisely constrained CEE has become more important in the
H. Ge +8 more
semanticscholar +1 more source
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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Short-period pulsating hot-subdwarf stars observed by TESS. I. Southern ecliptic hemisphere [PDF]
Astronomy & Astrophysics, 2022 We present results of a Transiting Exoplanet Survey Satellite (TESS) search for short-period pulsations in compact stellar objects observed in years 1 and 3 of the TESS mission, during which the southern ecliptic hemisphere was targeted.
A. Baran +9 more
semanticscholar +1 more source
A Hot Subdwarf Model for the 18.18 minutes Pulsar GLEAM-X [PDF]
Research Notes of the AAS, 2022 We suggest that the recently discovered, enigmatic pulsar with a period of 18.18 minutes, GLEAM-X J162759.5-523504.3, is most likely a hot subdwarf (proto white dwarf).
A. Loeb, D. Maoz
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