Results 111 to 120 of about 4,300 (180)

Molecular Hydrogen Controls the Temperatures of Flares on TRAPPIST-1

The Astrophysical Journal Letters
Early JWST observations of TRAPPIST-1 have revealed an unexpected puzzle: energetic white-light flares ( E  > 10 ^30 erg) reach temperatures of only ∼3500–4000 K, nearly 3 times cooler than typical solar flares, which peak around 9000–10,000 K.
A. I. Shapiro, N. Kostogryz, S. Seager, V. Witzke, J. de Wit, V. Vasilyev, Astrid M. Veronig, Cameron Robert, Peter Hardi, S. K. Solanki   +9 more
doaj   +1 more source

Detailed Analysis of Six Contact Binaries and their Possible Origin

The Astronomical Journal
A photometric investigation of six binary systems of the W Ursae Majoris (W UMa)-type is presented. We extracted primary and secondary minima from the Transiting Exoplanet Survey Satellite observations of these systems.
Somayeh Soomandar, Lorne Nelson, Joshua Aiken   +2 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

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

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 on eclipsing giant stars

Astronomy & Astrophysics
Oláh K., Seli B., Haris A., Rappaport S., Tuomi M., Gagliano R., Jacobs T. L., Kristiansen M. H., Schwengeler H. M., Omohundro M., Terentev I., Vanderburg A., Powell B., Kostov V., Kővári Zs.   +14 more
doaj   +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