Observations and modeling of spectral line asymmetries in stellar flare
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F23%3A00570191" target="_blank" >RIV/67985815:_____/23:00570191 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0341976" target="_blank" >https://hdl.handle.net/11104/0341976</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/202244544" target="_blank" >10.1051/0004-6361/202244544</a>
Alternative languages
Result language
angličtina
Original language name
Observations and modeling of spectral line asymmetries in stellar flare
Original language description
We observed the dMe star AD Leo using the 2-meter Perek telescope at Ondrejov observatory, with simultaneous photometric light curves. In analogy with solar flares, we modeled the H alpha line emergent from an extensive arcade of cool flare loops and explain the observed asymmetries using the concept of coronal rain.Methods. We solved the non-LTE (departures from local thermal equilibrium) radiative transfer in H alpha within cool flare loops taking the velocity distribution of individual rain clouds into account. For a flare occurring at the center of the stellar disk, we then integrated radiation emergent from the whole arcade to obtain the flux from the loop area. We observed two flares in the H alpha line that exhibit a red wing asymmetry corresponding to velocities up to 50 km s(-1) during the gradual phase of the flare. Synthetic profiles generated from the model of coronal rain have enhanced red wings that are quite compatible with observations.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics
ISSN
0004-6361
e-ISSN
1432-0746
Volume of the periodical
669
Issue of the periodical within the volume
January
Country of publishing house
FR - FRANCE
Number of pages
12
Pages from-to
A118
UT code for WoS article
000922771500012
EID of the result in the Scopus database
2-s2.0-85147094644