Results 81 to 90 of about 3,864 (175)
“X-Raying” a Be Star Disk: Fundamental Parameters of the Eclipsing Binary Be Star V658 Car
The Astrophysical JournalWith its two stellar eclipses and two disk attenuations per binary orbit, V658 Carinae stands out as the first clear eclipsing Be + sdOB system. This rare alignment offers a unique opportunity to probe the structure and dynamics of a Be star disk with ...
Tajan H. de Amorim +10 more
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Asteroseismology of hot subdwarf B stars observed with TESS: discovery of two new gravity mode pulsating stars [PDF]
, 2022 Murat Uzundag +6 more
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A Search for Subdwarf B Binaries Using Pulsation Timing from TESS
The Astronomical JournalHot subdwarf B (sdB) stars are post-main-sequence stars of high temperature and gravity. Approximately 30% of sdBs exhibit stable pressure and/or gravity-mode pulsations, which can be used via the timing method to test for companion stars and determine ...
Tomomi Otani +5 more
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Ages of White Dwarf-Red Subdwarf Systems
, 2005 We provide the first age estimates for two recently discovered white dwarf-red subdwarf systems, LHS 193AB and LHS 300AB. These unusual systems provide a new opportunity for linking the reliable age estimates for the white dwarfs to the (measurable ...
Bessel M. S. +9 more
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The Astrophysical JournalCommon envelope evolution (CEE) is vital for forming short-orbital-period compact binaries. It covers many objects, such as double compact merging binaries, Type Ia supernovae progenitors, binary pulsars, and X-ray binaries.
Hongwei Ge +8 more
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Discovery of a rapidly pulsating subdwarf B star candidate in omega Cen
, 2008 We report the discovery of the first variable extreme horizontal branch star in a globular cluster (omega Cen). The oscillation uncovered has a period of 114 s and an amplitude of 32 mmags.
A. Calamida +33 more
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Flare Hunting in Hot Subdwarf and White Dwarf Stars from Cycles 1–5 of TESS Photometry
The Astrophysical Journal Supplement SeriesStellar flares are critical phenomena on stellar surfaces, which are closely tied to stellar magnetism. While extensively studied in main-sequence (MS) stars, their occurrence in evolved compact stars, specifically hot subdwarfs and white dwarfs (WDs ...
Keyu Xing +11 more
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, 2013 The predicted orbital-period distribution of the subdwarf-B (sdB) population is bi-modal with a peak at short ( 250 days) periods. Observationally, many short-period sdB systems are known, but the predicted long period peak is missing as orbits have only
Green, E. M. +5 more
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Observational Parameters of Blue Large-amplitude Pulsators
The Astrophysical Journal Supplement SeriesBlue large-amplitude pulsators (BLAPs) are a recently discovered class of short-period pulsating variable stars. In this work, we present new information on these stars based on photometric and spectroscopic data obtained for known and new objects ...
Paweł Pietrukowicz +17 more
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, 2010 HD 49798 is a hydrogen depleted subdwarf O6 star and has an X-ray pulsating companion (RX J0648.0-4418). The X-ray pulsating companion is a massive white dwarf. Employing Eggleton's stellar evolution code with the optically thick wind assumption, we find
Han, Zhanwen, Wang, Bo
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