Results 141 to 150 of about 17,719 (230)

The Impact of Stellar Flares on the Atmospheric Escape of Exoplanets Orbiting M Stars. I. Insights from the AU Mic System

The Astrophysical Journal
The X-ray and extreme ultraviolet (XUV) emission from M stars can drive the atmospheric escape on planets orbiting them. M stars are also known for their frequent emission of stellar flares, which will increase the high-energy flux received by their ...
Laura N. R. do Amaral, Evgenya L. Shkolnik, R. O. Parke Loyd, Sarah Peacock   +3 more
doaj   +1 more source

A Universal Correlation between the Duration and the X-ray Luminosity in Stellar Flares [PDF]

Proceedings of XII Multifrequency Behaviour of High Energy Cosmic Sources Workshop — PoS(MULTIF2017), 2018
Yohko Tsuboi, \\"Ryo Sasaki\\", \\"Yasuharu Sugawara\\", \\"Masaru Matsuoka\\"   +3 more
openaire   +1 more source

Eclipsing Stellar Flare on the Demon Star Algol Binary System Observed during the MAXI–NICER Follow-up Campaign in 2018

The Astrophysical Journal
Algol is a well-known eclipsing binary hosting an active and variable star that exhibits frequent stellar flares. Here, we report our preplanned and coordinated rapid X-ray follow-up observations of an eclipsing flare on Algol.
Kazuya Nakayama, Wataru Buz Iwakiri, Teruaki Enoto, Shun Inoue, Yuta Notsu, Keith Gendreau, Zaven Arzoumanian, Kenji Hamaguchi, Tatehiro Mihara   +8 more
doaj   +1 more source

X-rays of Stellar Coronae with Chandra and XMM-Newton: Flares and Elemental Composition in Stellar Atmospheres (Invited review)

, 2004
Observations of magnetically active stars with Chandra and XMM-Newton have deepened our knowledge of the physics of the atmospheres in late-type stars. In this review paper, I discuss two topics that have profited significantly from Chandra and XMM-Newton.
openaire   +2 more sources

Starspots: A Key to the Stellar Dynamo

Living Reviews in Solar Physics, 2005
Magnetic activity similar to that of the Sun is observed on a variety of cool stars with external convection envelopes. Stellar rotation coupled with convective motions generate strong magnetic fields in the stellar interior and produce a multitude of ...
Berdyugina Svetlana V.
doaj  

Quiescent and Flaring States of Three Active Stars: V834 Tau, LQ Hya, and BY Dra

The Astrophysical Journal
We present a detailed X-ray study of the quiescent and flaring coronae of three active main-sequence K-type stars, V834 Tau, LQ Hya, and BY Dra, using XMM-Newton observations.
Gurpreet Singh, Jeewan C. Pandey, Subhajeet Karmakar   +2 more
doaj   +1 more source

Characterizing Superflares in HR 1099 Using Temporal and Spectral Analysis of XMM-Newton Observations

The Astronomical Journal
In the present paper, we analyze three energetic X-ray flares from the active RS CVn binary HR 1099 using data obtained from XMM-Newton. The flare duration ranges from 2.8 to 4.1 hr, with e -folding rise and decay times in the range of 27–38 minutes and ...
Shweta Didel, Jeewan C. Pandey, A.K. Srivastava   +2 more
doaj   +1 more source

Ultraviolet Quasiperiodic Eruptions from Star–Disk Collisions in Galactic Nuclei

The Astrophysical Journal Letters
“Quasiperiodic eruptions” (QPE) are recurrent nuclear transients with periods of several hours to almost a day, which thus far have been detected exclusively in the X-ray band.
Itai Linial, Brian D. Metzger
doaj   +1 more source

Resolved imaging confirms a radiation belt around an ultracool dwarf. [PDF]

Nature, 2023
Kao MM, Mioduszewski AJ, Villadsen J, Shkolnik EL.   +3 more
europepmc   +1 more source

Energy conversion in the coronal plasma [PDF]

Solar and stellar X-ray emission are the observed waste products of the interplay between magnetic fields and the motion of stellar plasma. Theoretical understanding of the process of coronal heating is of utmost importance, since the high temperature is
Martens, P. C. H.
core   +1 more source