Results 81 to 90 of about 205 (134)

Spot Distribution and Evolution on Two New Active Binaries Discovered in the YNHK Survey

The Astronomical Journal
The study on active binaries can provide detailed insights to understand how binarity affects dynamo actions inside stellar interiors. Here we report two active eclipsing binaries, USNO-B1.0 0743-0306638 and 0763-0282368, discovered in the Yunnan–Hong ...
Jianhua Wang, Shenghong Gu, Xiaobin Wang, Bill Yeung, Eric Ng, Kamfung Yu, Leilei Sun, Yue Xiang, Dongtao Cao, Baoli Lun, Yuxin Xin, Fukun Xu, Xiaoyun Xu, Jing Huang, Weilong Wang, Xinyu Zhu   +15 more
doaj   +1 more source

BRITE Nanosat Photometry Reveals Bright Spots in the Single Wolf–Rayet Star EZ CMa That Can Drive Spectral-line-emitting Corotating Interaction Regions

The Astrophysical Journal
We analyze an unprecedented 4.5 contiguous months of 2015–2016 BRITE nanosatellite precision optical photometry of the 7th mag Wolf–Rayet (WR) star EZ CMa = WR 6 = HD 50896.
Anthony F. J. Moffat, Richard Ignace, André-Nicolas Chené, Guillaume Lenoir-Craig   +3 more
doaj   +1 more source

Starspot Coverage on Two New K-type Low-mass Eclipsing Binaries with Radius Inflation

The Astronomical Journal
Utilizing data from the Transiting Exoplanet Survey Satellite (TESS) and LAMOST, we present a photometric and spectroscopic investigation of two new K-type low-mass eclipsing binaries, TIC 56913729 and TIC 97729372.
Yang Pan, Antonio Frasca, Jia-Xin Wang, Jian-Ning Fu, Xiao-Bin Zhang   +4 more
doaj   +1 more source

The Relationship of Stellar Radius Inflation to Rotation and Magnetic Starspots at 10–670 Myr

The Astrophysical Journal Letters
Active, low-mass stars are widely observed to have radii that are larger than predicted by standard stellar models. Proposed mechanisms for this radius inflation generally involve stellar magnetism, either in the form of added pressure support in the ...
Lyra Cao, Keivan G. Stassun
doaj   +1 more source

A Search for the O’Connell Effect in Contact Binaries in the Era of Big Sky Surveys. I.

The Astrophysical Journal Supplement Series
Asymmetries between the two maxima of the light curves of contact binaries, known as the O’Connell effect, have been identified using the All Sky Automated Survey, All-Sky Automated Survey for Supernovae, Northern Sky Variability Survey, Optical ...
Georgios D. Kleftogiannis, Panagiota-Eleftheria Christopoulou, Athanasios Papageorgiou   +2 more
doaj   +1 more source

A study of pulsation & rotation in a sample of A-K type stars in the Kepler field. [PDF]

Astrophys Space Sci, 2018
Chowdhury S, Joshi S, Engelbrecht CA, De Cat P, Joshi YC, Paul KT.   +5 more
europepmc   +1 more source

Modeling a Carrington-scale Stellar Superflare and Coronal Mass Ejection from κ ¹ Cet. [PDF]

Astrophys J, 2019
Lynch BJ, Airapetian VS, DeVore CR, Kazachenko MD, Lüftinger T, Kochukhov O, Rosén L, Abbett WP.   +7 more
europepmc   +1 more source

Astrophysical processes on the sun. [PDF]

Philos Trans A Math Phys Eng Sci, 2012
Parnell CE.
europepmc   +1 more source

Starspots as the origin of ultrafast drifting radio bursts from an active M dwarf. [PDF]

Sci Adv
Zhang J, Tian H, Bellotti S, Cang T, Callingham JR, Vedantham HK, Chen B, Yu S, Zarka P, Louis CK, Jiang P, Lu H, Gao Y, Sun J, Gan H, Li H, Sun C, Lei Z, Huang M.   +18 more
europepmc   +1 more source

Using a neural network approach and starspots dependent models to predict effective temperatures and ages of young stars. [PDF]

PLoS One
Tarantino M, Prisinzano L, D'Angelo N, Damiani F, Adelfio G.   +4 more
europepmc   +1 more source