Radial velocity variability and the evolution of hot subdwarf stars [PDF]
Astronomy & Astrophysics, 2022 Hot subdwarf stars represent a late and peculiar stage in the evolution of low-mass stars, since they are likely formed by close binary interactions. In this work, we perform a radial velocity (RV) variability study of a sample of 646 hot subdwarfs with ...
S. Geier +5 more
semanticscholar +1 more source
A Roche Lobe-filling hot Subdwarf and White Dwarf Binary: Possible detection of an ejected common envelope? [PDF]
Monthly notices of the Royal Astronomical Society, 2022 Binaries consisting of a hot subdwarf star and an accreting white dwarf (WD) are sources of gravitational wave radiation at low frequencies and possible progenitors of type Ia supernovae if the WD mass is large enough.
Jiangdan Li +14 more
semanticscholar +1 more source
Discovery and analysis of three magnetic hot subdwarf stars: evidence for merger-induced magnetic fields [PDF]
, 2022 Magnetic fields can play an important role in stellar evolution. Among white dwarfs, the most common stellar remnant, the fraction of magnetic systems is more than 20 per cent.
I. Pelisoli +8 more
semanticscholar +1 more source
Pulse Timing Discovery of a Three-day Companion to the Hot Subdwarf BPM 36430 [PDF]
Astrophysical Journal, 2022 Hot subdwarf B stars are core-helium-burning objects that have undergone envelope stripping, likely by a binary companion. Using high-speed photometry from the Transiting Exoplanet Survey Satellite, we have discovered the hot subdwarf BPM 36430 is a ...
Bryce A. Smith +4 more
semanticscholar +1 more source
Hot Subdwarf Atmospheric Parameters, Kinematics, and Origins Based on 1587 Hot Subdwarf Stars Observed in Gaia DR2 and LAMOST DR7 [PDF]
Astrophysical Journal Supplement Series, 2021 Based on the Gaia DR2 catalog of hot subdwarf star candidates, we identified 1587 hot subdwarf stars with spectra in LAMOST DR7. We present atmospheric parameters for these stars by fitting the LAMOST spectra with Tlusty/Synspec non-LTE synthetic spectra.
Yangping Luo +4 more
semanticscholar +1 more source
The First Retrieval of a Substellar Subdwarf: A Cloud-free SDSS J125637.13–022452.4 [PDF]
Astrophysical Journal, 2021 We present the first retrieval analysis of a substellar subdwarf, SDSS J125637.13−022452.4 (SDSS J1256−0224), using the Brewster retrieval code base.
Eileen C. Gonzales +7 more
semanticscholar +1 more source
The origin of subdwarf B stars
Bulletin de la Société royale des sciences de Liège, 2023 The origin of subdwarf B stars (sdBs) is unclear. Different formation channels are proposed including: close-binary evolution, helium-mixing on the red giant branch and the hot flasher scenario.
Callum Aubrey, R. Napiwotzki
semanticscholar +1 more source
Kinematics of nearby Subdwarfs [PDF]
Astrophysics and Space Science, 1999 Latex, 4 pages, 6 figures. To appear in the proceedings of the `Galaxy Evolution' conference held in Meudon, September, 21 - 25 ...
Fuchs, B., Jahreiss, H., Wielen, R.
openaire +2 more sources
Year 1 of the ZTF high-cadence Galactic plane survey: strategy, goals, and early results on new single-mode hot subdwarf B-star pulsatos [PDF]
Monthly notices of the Royal Astronomical Society, 2021 We present the goals, strategy, and first results of the high-cadence Galactic plane survey using the Zwicky Transient Facility (ZTF). The goal of the survey is to unveil the Galactic population of short-period variable stars, including short-period ...
T. Kupfer +20 more
semanticscholar +1 more source
The subdwarf luminosity function [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 Using data from the Sloan Digital Sky Survey Early Data Release and SuperCOSMOS Sky Survey scans of POSS-I plates we identify a sample of 2600 subdwarfs using reduced proper motion methods and strict selection criteria. This forms one of the largest and most reliable samples of candidate subdwarfs known, and enables us to determine accurate luminosity ...
Digby, Andrew P. +4 more
openaire +2 more sources