Results 21 to 30 of about 6,507,263 (232)

The Soft X-ray Lightcurves of Partially Eclipsed Stellar Flares [PDF]

open access: yesMonthly Notices of the Royal Astronomical Society, 2011
Most stellar flares' soft X-ray light curves possess a 'typical' morphology, which consists of a rapid rise followed by a slow exponential decay. However, a study of 216 of the brightest flares on 161 pre-main-sequence stars, observed during the Chandra Orion Ultradeep Project (COUP), showed that many flare light curves depart from this typical ...
Johnstone, C. P.   +3 more
openaire   +4 more sources

Geometry Diagnostics of a Stellar Flare from Fluorescent X-Rays [PDF]

open access: yesThe Astrophysical Journal, 2008
accepted for publication on the Astrophysical Journal ...
TESTA, Paola   +7 more
openaire   +3 more sources

A 7 Day Multiwavelength Flare Campaign on AU Mic. I. High-time-resolution Light Curves and the Thermal Empirical Neupert Effect

open access: yesThe Astrophysical Journal, 2023
We present light curves and flares from a 7 day, multiwavelength observational campaign of AU Mic, a young and active dM1e star with exoplanets and a debris disk. We report on 73 unique flares between the X-ray to optical data.
Isaiah I. Tristan   +15 more
doaj   +1 more source

Stable Coronal X-Ray Emission over 20 yr of XZ Tau

open access: yesThe Astronomical Journal, 2023
XZ Tau AB is a frequently observed binary young stellar object in the Taurus Molecular Cloud; XZ Tau B has been classified as an EXOr object. We present new Chandra/HETG-ACIS-S observations of XZ Tau AB, complemented with variability monitoring of the ...
Steven M. Silverberg   +5 more
doaj   +1 more source

Modeling Hadronic Gamma-Ray Emissions from Solar Flares and Prospects for Detecting Nonthermal Signatures from Protostars

open access: yesThe Astrophysical Journal, 2023
We investigate gamma-ray emission in the impulsive phase of solar flares and the detectability of nonthermal signatures from protostellar flares. Energetic solar flares emit high-energy gamma rays of GeV energies, but their production mechanism and ...
Shigeo S. Kimura   +2 more
doaj   +1 more source

X-Ray Emission from Stellar Flares: Exosat Results [PDF]

open access: yesInternational Astronomical Union Colloquium, 1989
AbstractWe present an overview of recent observations of stellar X-ray flares obtained with the EXOSAT Observatory. We discuss a few examples of flares from M dwarf flare stars, from RS CVn and Algol-type binaries, from single late-type stars (including a G0 dwarf and an A-type visual binary), and from pre-main-sequence objects.
R. Pallavicini, G. Tagliaferri
openaire   +1 more source

X-Ray Observations of Stellar Flares [PDF]

open access: yesInternational Astronomical Union Colloquium, 1983
ABSTRACTThe history of stellar X-ray flare observations prior to EINSTEIN is reviewed. X-ray light curves as measured by the IPC are then presented for all time resolved flare events discovered as of July 1982 in the EINSTEIN data set. These light curves are analyzed in terms of solar-like loop models to derive densities, temperatures, loop lengths ...
openaire   +1 more source

A stellar flare−coronal mass ejection event revealed by X-ray plasma motions [PDF]

open access: yesNature Astronomy, 2019
Letter published on Nature Astronomy, see https://rdcu.be ...
C. Argiroffi   +8 more
openaire   +5 more sources

Analysis of Solar-like X-class Flare on Wolf 359 Observed Simultaneously with TESS and XMM-Newton

open access: yesThe Astrophysical Journal, 2023
We present an analysis of a flare on the Wolf 359 star based on simultaneous observations of Transiting Exoplanet Survey Satellite and XMM-Newton. A stellar flare with energy comparable to an X-class solar flare is analyzed on this star for the first ...
M. Pietras   +5 more
doaj   +1 more source

Preliminary Appraisal of a Correlation Between Glaciations and Large Igneous Provinces Over the Past 720 Million Years

open access: yesGeophysical Monograph Series, Page 169-190., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Nasrrddine Youbi   +9 more
wiley  

+1 more source

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