Results 1 to 10 of about 11,496,581 (289)

Variability of Magnetic Hot Stars from the TESS Observations

The Astrophysical Journal, 2023
Magnetic hot stars refer to stars that have effective temperatures approximately in the range from 7000–50,000 K, and with large-scale globally organized magnetic fields.
Dong-Xiang Shen, Gang Li, Iskandar Abdusamatjan, Jian-Ning Fu, Chun-Hua Zhu, Jin-Long Yu, Yu Zhang, Guo-Liang Lü, Nan-Nan Zhai, Jin-Zhong Liu   +9 more
doaj   +1 more source

Five Massive Contact Binaries with Twin Components in LMC

The Astrophysical Journal, 2023
Massive contact binaries refer to the close binary systems in which the components have filled their respective Roche lobes and share a common envelope with early-type spectra.
Fu-Xing Li, Sheng-Bang Qian, Chu-Qi Wu, Min-Yu Li, Er-Gang Zhao, Wen-Ping Liao, Li-Ying Zhu, Qi-Bin Sun, Jia Zhang   +8 more
doaj   +1 more source

New Method to Detect and Characterize Active Be Star Candidates in Open Clusters

Galaxies, 2023
With the aim of better understanding the physical conditions under which Be stars form and evolve, it is imperative to further investigate whether poorly studied young open clusters host Be stars.
Anahí Granada, Maziar R. Ghoreyshi, Carol E. Jones, Tõnis Eenmäe   +3 more
doaj   +1 more source

Asteroseismology of Close Binary Stars: Tides and Mass Transfer

Frontiers in Astronomy and Space Sciences, 2021
The study of stellar oscillations allows us to infer the properties of stellar interiors. Meanwhile, fundamental parameters such as mass and radius can be obtained by studying stars in binary systems. The synergy between binarity and asteroseismology can
Zhao Guo
doaj   +1 more source

New Methods in Modeling of Hot Stellar Atmospheres

Open Astronomy, 2013
In the present study we had three main aims. First to study the possibility of reducing the initial model atmosphere data to short analytical polynomials.
Sapar A., Poolamäe R., Sapar L.
doaj   +1 more source

Revealing the Binarity of HD 36030—One of the Hottest Flare Stars

Galaxies, 2023
The Kepler and TESS space missions significantly expanded our knowledge of what types of stars display flaring activity by recording a vast amount of super-flares from solar-like stars, as well as detecting flares from hotter stars of A-F spectral types.
Olga Maryeva, Péter Németh, Sergey Karpov   +2 more
doaj   +1 more source

A New High-Precision Correction Method of Temperature Distribution in Model Stellar Atmospheres

Open Astronomy, 2013
The main features of the temperature correction methods, suggested and used in modeling of plane-parallel stellar atmospheres, are discussed. The main features of the new method are described.
Sapar A., Poolamäe R., Sapar L.
doaj   +1 more source

A Study of Stochastic Low-frequency Variability for Galactic O-type Stars

The Astrophysical Journal Supplement Series
In order to explore how the ubiquitous stochastic low-frequency (SLF) variability of O-type stars is related to various stellar characteristics, we compiled a sample of 150 O-type stars observed via ground-based spectroscopic surveys, alongside ...
Dong-Xiang Shen, Chun-Hua Zhu, Guo-Liang Lü, Xi-zhen Lu, Xiao-long He   +4 more
doaj   +1 more source

The Value-added Catalog of OB Stars in LAMOST DR7

The Astrophysical Journal Supplement Series
In this work, we update the catalog of OB stars based on the Large Sky Area Multi-Object Fiber Spectroscopic Telescope data release 7 and modify the OB stars’ selection criteria in spectral line indices’ space.
Zhicun Liu, Wenyuan Cui, Jiajia Gu, Jianrong Shi, Guozhen Hu, Xiao-Long Wang, Zhenyan Huo   +6 more
doaj   +1 more source

New Libraries of Nonlocal Thermodynamic Equilibrium Model Spectra for O and Early-B Stars

The Astronomical Journal
A new set of stellar spectral models is generated from nonlocal thermodynamic equilibrium metal line-blanketed model atmospheres of T. Lanz & I. Hubeny.
Ivan Hubeny, Ralph Bohlin, Karl Gordon, Edward Fitzpatrick   +3 more
doaj   +1 more source