Hydrogen recombination continua in stellar flares

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00616862" target="_blank" >RIV/67985815:_____/24:00616862 - isvavai.cz</a>

Result on the web

<a href="https://hdl.handle.net/11104/0363848" target="_blank" >https://hdl.handle.net/11104/0363848</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnrasl/slae046" target="_blank" >10.1093/mnrasl/slae046</a>

Result language

angličtina

Original language name

Hydrogen recombination continua in stellar flares

Original language description

An increasing interest in stellar flares stimulated various modelling approaches in order to analyse the observed flare fluxes. A particular interest was focused on photometric data obtained from Kepler and TESS satellites which detected thousands of flares on cool dwarf stars, including extremely energetic superflares. Radiation-hydrodynamical simulations, together with a rather rare broad-band spectroscopy, indicate much larger densities in the superflare chromospheres as compared to solar flares. Formation of hydrogen recombination continua under such different densities ranging from 1013 to 1015 cm-3 or more is governed by physics of optically thin to largely thick plasmas, the continuum optical thickness being within the range of four orders of magnitude. Various authors presented simple approximate methods to analyse the photometric data from Kepler or TESS under such diverse regimes of physical conditions. In this letter, we summarize the general physical approach and compute the hydrogen recombination spectra under the above range of electron densities. We show the theoretical contrast with respect to quiet-star continuum for two characteristic stars of G and dMe type. Based on that we distinguish three regimes of the continuum formation and discuss the applicability of various simple approaches.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GF22-30516K" target="_blank" >GF22-30516K: Superflares: Their origins and connection with planets</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

Monthly Notices of the Royal Astronomical Society: Letters

ISSN

1745-3925

e-ISSN

1745-3933

Volume of the periodical

532

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

5

Pages from-to

"L56"-"L60"

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85195075403