Results 51 to 60 of about 130 (117)
A Target or the Next XCov23 Campaign: KPD 1930+2752
Open Astronomy, 2003 KPD 1930+2752 is a pulsating subdwarf B star with a particularly rich period spectrum, likely due to significant rotational splitting. It is also a short period (~ 2h17m), close binary system (as revealed by the presence of an ellipsoidal variation in ...
Charpinet S., Reed M.D.
doaj +1 more source
EPJ Web of Conferences, 2017 Nonlinear mode interactions are difficult to observe from ground-based telescopes as the typical periods of the modulations induced by those nonlinear phenomena are on timescales of weeks, months, even years. The launch of space telescopes, e.g., Kepler,
Zong Weikai +4 more
doaj +1 more source
The Arizona-Montréal Spectroscopic Survey of hot subluminous stars★
Astronomy & AstrophysicsContext. Hot subdwarf B (sdB) and O (sdO) type stars are evolved helium-burning objects that lost their hydrogen envelope before the helium flash when their progenitors were close to the tip of the red giant branch (RGB).
Latour M. +8 more
doaj +1 more source
“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
doaj +1 more source
An additional pulsating mode (7.35 mHz) and pulsations timing variations of PG 1613+426
Open Astronomy, 2017 We present the detection of an additional pulsation mode (7.35 mHz) of a subdwarf B star, PG 1613+426, and periodic Observed minus Calculated (O-C) variations for two existing pulsations. PG 1613+426 is near the hot end of the sdB instability strip.
Otani Tomomi +5 more
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
I-Process Nucleosynthesis in AM CVn Systems
GalaxiesWe investigate nucleosynthesis during very strong, non-dynamical recurrent He-flashes that are expected to occur in close binary systems hosting a carbon–oxygen white dwarf and a type-B subdwarf companion.
Luciano Piersanti +6 more
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source