Chromospheric changes in K stars with activity
Corresponding Author
Mariela C. Vieytes
Instituto de Astronomía y Física del Espacio, CC. 67 Suc. 28, 1428 Buenos Aires, Argentina
E-mail: [email protected]
Visiting Astronomer, Complejo Astronómico El Leoncito operated under agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina and the National Universities of La Plata, Córdoba and San Juan.
Search for more papers by this authorPablo J. D. Mauas
Instituto de Astronomía y Física del Espacio, CC. 67 Suc. 28, 1428 Buenos Aires, Argentina
Search for more papers by this authorCorresponding Author
Rodrigo F. Díaz
Instituto de Astronomía y Física del Espacio, CC. 67 Suc. 28, 1428 Buenos Aires, Argentina
E-mail: [email protected]
Visiting Astronomer, Complejo Astronómico El Leoncito operated under agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina and the National Universities of La Plata, Córdoba and San Juan.
Search for more papers by this authorCorresponding Author
Mariela C. Vieytes
Instituto de Astronomía y Física del Espacio, CC. 67 Suc. 28, 1428 Buenos Aires, Argentina
E-mail: [email protected]
Visiting Astronomer, Complejo Astronómico El Leoncito operated under agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina and the National Universities of La Plata, Córdoba and San Juan.
Search for more papers by this authorPablo J. D. Mauas
Instituto de Astronomía y Física del Espacio, CC. 67 Suc. 28, 1428 Buenos Aires, Argentina
Search for more papers by this authorCorresponding Author
Rodrigo F. Díaz
Instituto de Astronomía y Física del Espacio, CC. 67 Suc. 28, 1428 Buenos Aires, Argentina
E-mail: [email protected]
Visiting Astronomer, Complejo Astronómico El Leoncito operated under agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina and the National Universities of La Plata, Córdoba and San Juan.
Search for more papers by this authorABSTRACT
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.
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