Observations and modeling of spectral line asymmetries in stellar flare

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Observations and modeling of spectral line asymmetries in stellar flare

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Observations and modeling of spectral line asymmetries in stellar flare

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Svazek periodika

669

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

12

Strana od-do

A118

Kód UT WoS článku

000922771500012

EID výsledku v databázi Scopus

2-s2.0-85147094644