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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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00358711_v398_n3_p1495_Vieytes |
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todo:paper_00358711_v398_n3_p1495_Vieytes2023-10-03T14:46:55Z Chromospheric changes in K stars with activity Vieytes, M.C. Mauas, P.J.D. Díaz, R.F. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 Vieytes, M.C. Mauas, P.J.D. Díaz, R.F. 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. |
| format |
JOUR |
| author |
Vieytes, M.C. Mauas, P.J.D. Díaz, R.F. |
| author_facet |
Vieytes, M.C. Mauas, P.J.D. Díaz, R.F. |
| author_sort |
Vieytes, M.C. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_00358711_v398_n3_p1495_Vieytes |
| work_keys_str_mv |
AT vieytesmc chromosphericchangesinkstarswithactivity AT mauaspjd chromosphericchangesinkstarswithactivity AT diazrf chromosphericchangesinkstarswithactivity |
| _version_ |
1807320252840673280 |