2009/06/09 by Mariela C. Vieytes, Mariela Vieytes, Pablo Mauas +3
Physics and Astronomy · #Astronomy and Astrophysical Research #Radiative transfer #Scientific Research and Discoveries #Spectral index #Spectral line #Stars #Stellar atmosphere #Stellar classification #Stellar, planetary, and galactic studies #astro-ph.SR
paper · pdf · doi:10.1111/j.1365-2966.2009.15207.x
arxiv created 2009/06/09 · openalex publication_date 2009/08/24 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 SCa II, the index generally used as a proxy for activity, as we found for G stars.