Results 51 to 60 of about 127 (114)

The Arizona-Montréal Spectroscopic Survey of hot subluminous stars★

Astronomy & Astrophysics
Context. 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., Green E. M., Dorsch M., Van Grootel V., Chayer P., Charpinet S., Heber U., Randall S. K., Ma X.-Y.   +8 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, Oswalt Terry D., Majewski Patrice, Jordan Riley, Amaral Marc, Moss Adam   +5 more
doaj   +1 more source

“X-Raying” a Be Star Disk: Fundamental Parameters of the Eclipsing Binary Be Star V658 Car

The Astrophysical Journal
With 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, Alex C. Carciofi, Jonathan Labadie-Bartz, Ariane C. Silva, Felipe Navarete, Saul A. Rappaport, Pamela Querido, Amanda C. Rubio, Jon Bjorkman, Robert Gagliano, Ivan Terentev   +10 more
doaj   +1 more source

A Search for Subdwarf B Binaries Using Pulsation Timing from TESS

The Astronomical Journal
Hot 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, A. S. Baran, Lindsay C. Spence, Ted von Hippel, E. Lynum- Lozano, Julia. M. Clark   +5 more
doaj   +1 more source

The Common Envelope Evolution Outcome. II. Short-orbital-period Hot Subdwarf B Binaries Reveal a Clear Picture

The Astrophysical Journal
Common 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, Christopher A Tout, Ronald F Webbink, Xuefei Chen, Arnab Sarkar, Jiao Li, Zhenwei Li, Lifu Zhang, Zhanwen Han   +8 more
doaj   +1 more source

I-Process Nucleosynthesis in AM CVn Systems

Galaxies
We 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, Diego Vescovi, Sergio Cristallo, Lev R. Yungelson, Eduardo Bravo, Inmaculada Dominguez, Alexandre G. Kuranov   +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 Series
Stellar 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, Weikai Zong, Roberto Silvotti, Jian-Ning Fu, Stéphane Charpinet, Tianqi Cang, J. J. Hermes, Xiao-Yu Ma, Haotian Wang, Xuan Wang, Tao Wu, Jiaxin Wang   +11 more
doaj   +1 more source

Observational Parameters of Blue Large-amplitude Pulsators

The Astrophysical Journal Supplement Series
Blue 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, Marilyn Latour, Igor Soszyński, Francesco Di Mille, Piera Soto King, Rodolfo Angeloni, Radosław Poleski, Andrzej Udalski, Michał K. Szymański, Krzysztof Ulaczyk, Szymon Kozłowski, Jan Skowron, Dorota M. Skowron, Przemek Mróz, Krzysztof Rybicki, Patryk Iwanek, Marcin Wrona, Mariusz Gromadzki   +17 more
doaj   +1 more source

A New Route to Massive Hot Subdwarfs: Common Envelope Ejection from Asymptotic Giant Branch Stars

The Astrophysical Journal
The hot subdwarf O/B stars (sdO/Bs) are known as extreme horizontal branch stars, which is of great importance in stellar evolution theory. The sdO/Bs are generally thought to have a helium-burning core and a thin hydrogen envelope ( M _env < 0.02 M _⊙ ).
Zhenwei Li, Yangyang Zhang, Hailiang Chen, Hongwei Ge, Dengkai Jiang, Jiangdan Li, Xuefei Chen, Zhanwen Han   +7 more
doaj   +1 more source

Overview of the LAMOST survey in the first decade. [PDF]

Innovation (Camb), 2022
Yan H, Li H, Wang S, Zong W, Yuan H, Xiang M, Huang Y, Xie J, Dong S, Yuan H, Bi S, Chu Y, Cui X, Deng L, Fu J, Han Z, Hou J, Li G, Liu C, Liu J, Liu X, Luo A, Shi J, Wu X, Zhang H, Zhao G, Zhao Y.   +26 more
europepmc   +1 more source