COOL SUBDWARF INVESTIGATIONS. III. DYNAMICAL MASSES OF LOW-METALLICITY SUBDWARFS [PDF]
The Astronomical Journal, 2016 ABSTRACT We report dynamical mass measurements for the components of the previously known double-lined spectroscopic subdwarfs G 006-026 B and C using the Fine Guidance Sensors on the Hubble Space Telescope. To build the empirical mass–luminosity relation for low-metallicity subdwarfs, we collect four other subdwarf systems with ...
Wei-Chun 饒惟君 Jao +4 more
openaire +2 more sources
Asteroseismic analysis of variable hot subdwarf stars observed with TESS [PDF]
Astronomy & Astrophysics, 2021 Context. We present photometric and spectroscopic analyses of gravity (g-mode) long-period pulsating hot subdwarf B (sdB) stars, also called V1093 Her stars, observed by the TESS space telescope in both 120 s short-cadence and 20 s ultra-short-cadence ...
M. Uzundag +10 more
semanticscholar +1 more source
X-rays from hot subdwarfs [PDF]
Advances in Space Research, 2016 Review paper to be published in Advances in Space Research (special issue on "X-ray emission from hot stars and their winds")
MEREGHETTI, Sandro, LA PALOMBARA, NICOLA
openaire +3 more sources
The population of hot subdwarf stars studied withGaia [PDF]
Astronomy & Astrophysics, 2020 In light of substantial new discoveries of hot subdwarfs by ongoing spectroscopic surveys and the availability of new all-sky data from ground-based photometric surveys and theGaiamission Data Release 2, we compiled an updated catalogue of the known hot ...
Stephan Geier
semanticscholar +1 more source
A search for hot subdwarf binaries in data from the Transiting Exoplanet Survey Satellite
Monthly notices of the Royal Astronomical Society, 2022 We present the results of a search for binary hot subdwarf stars in photometric data from the Transiting Exoplanet Survey Satellite (TESS). The sample of objects used in this work was a byproduct of another search for pulsating hot subdwarfs, which ...
J. Krzesinski +3 more
semanticscholar +1 more source
The First Ultracompact Roche Lobe–Filling Hot Subdwarf Binary [PDF]
Astrophysical Journal, 2020 We report the discovery of the first short-period binary in which a hot subdwarf star (sdOB) filled its Roche lobe and started mass transfer to its companion.
T. Kupfer +31 more
semanticscholar +1 more source
Alone but not lonely: Observational evidence that binary interaction is always required to form hot subdwarf stars [PDF]
Astronomy & Astrophysics, 2020 Context.Hot subdwarfs are core-helium burning stars that show lower masses and higher temperatures than canonical horizontal branch stars. They are believed to be formed when a red giant suffers an extreme mass-loss episode.
I. Pelisoli +4 more
semanticscholar +1 more source
A search for variable subdwarf B stars in TESS Full Frame Images – II. Variable objects in the northern ecliptic hemisphere [PDF]
, 2021 We report the results of our search for pulsating subdwarf B stars in Full Frame Images collected during Year 2 of the TESS mission and covering the northern ecliptic hemisphere. This is a continuation of our effort we presented in Paper I.
A. Baran +3 more
semanticscholar +1 more source
The Final Fates of Close Hot Subdwarf–White Dwarf Binaries: Mergers Involving He/C/O White Dwarfs and the Formation of Unusual Giant Stars with C/O-Dominated Envelopes [PDF]
Astrophysical Journal, 2021 Recently, a class of Roche-lobe-filling binary systems consisting of hot subdwarf stars and white dwarfs (WDs) with sub-hour periods has been discovered.
J. Schwab, E. Bauer
semanticscholar +1 more source
Discovery of CWISE J052306.42−015355.4, an Extreme T Subdwarf Candidate [PDF]
Astronomical Journal, 2021 We present the discovery of CWISE J052306.42−015355.4, which was found as a faint, significant proper-motion object (0.″52 ± 0.″08 yr−1) using machine-learning tools on the unWISE re-processing of time series images from the Wide-field Infrared Survey ...
Hunter Brooks +7 more
semanticscholar +1 more source