Chromospheric changes in K stars with activity

We study the differences in chromospheric structure induced in K stars by stellar activity, to expand our previous work for G stars, including the Sun as a star. We selected six stars of spectral type K with 0.82 < B - V < 0.90, including the widely studied Epsilon Eridani and a variet...

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Detalles Bibliográficos
Publicado: 2009
Materias:
Radiative transfer
Stars: activity
Stars: atmospheres
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v398_n3_p1495_Vieytes
http://hdl.handle.net/20.500.12110/paper_00358711_v398_n3_p1495_Vieytes
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00358711_v398_n3_p1495_Vieytes
record_format dspace
spelling paper:paper_00358711_v398_n3_p1495_Vieytes2023-06-08T15:01:27Z Chromospheric changes in K stars with activity Radiative transfer Stars: activity Stars: atmospheres We study the differences in chromospheric structure induced in K stars by stellar activity, to expand our previous work for G stars, including the Sun as a star. We selected six stars of spectral type K with 0.82 < B - V < 0.90, including the widely studied Epsilon Eridani and a variety of magnetic activity levels. We computed chromospheric models for the stars in the sample, in most cases in two different moments of activity. The models were constructed to obtain the best possible match with the Ca ii K and the Hβ observed profiles. We also computed in detail the net radiative losses for each model to constrain the heating mechanism that can maintain the structure in the atmosphere. We find a strong correlation between these losses and S Ca II, the index generally used as a proxy for activity, as we found for G stars. © 2009 RAS. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v398_n3_p1495_Vieytes http://hdl.handle.net/20.500.12110/paper_00358711_v398_n3_p1495_Vieytes
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Radiative transfer
Stars: activity
Stars: atmospheres
spellingShingle Radiative transfer
Stars: activity
Stars: atmospheres
Chromospheric changes in K stars with activity
topic_facet Radiative transfer
Stars: activity
Stars: atmospheres
description We study the differences in chromospheric structure induced in K stars by stellar activity, to expand our previous work for G stars, including the Sun as a star. We selected six stars of spectral type K with 0.82 < B - V < 0.90, including the widely studied Epsilon Eridani and a variety of magnetic activity levels. We computed chromospheric models for the stars in the sample, in most cases in two different moments of activity. The models were constructed to obtain the best possible match with the Ca ii K and the Hβ observed profiles. We also computed in detail the net radiative losses for each model to constrain the heating mechanism that can maintain the structure in the atmosphere. We find a strong correlation between these losses and S Ca II, the index generally used as a proxy for activity, as we found for G stars. © 2009 RAS.
title Chromospheric changes in K stars with activity
title_short Chromospheric changes in K stars with activity
title_full Chromospheric changes in K stars with activity
title_fullStr Chromospheric changes in K stars with activity
title_full_unstemmed Chromospheric changes in K stars with activity
title_sort chromospheric changes in k stars with activity
publishDate 2009
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v398_n3_p1495_Vieytes
http://hdl.handle.net/20.500.12110/paper_00358711_v398_n3_p1495_Vieytes
_version_ 1768544630384623616

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