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A statistical analysis of Hα-Ca II relation for solar-type stars of different activity levels

Published online by Cambridge University Press:  05 July 2012

Andrea P. Buccino ,
Mariela C. Vieytes  and
Pablo J. D. Mauas
Andrea P. Buccino
Affiliation:
Instituto de Astronomía y Física del Espacio (IAFE), CC 67-Suc. 28 (C1428ZAA), Ciudad Autónoma de Bs. As., Argentina email: abuccino@iafe.uba.ar Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Bs. As., Ciudad Autónoma de Bs. As., Argentina
Mariela C. Vieytes
Affiliation:
Instituto de Astronomía y Física del Espacio (IAFE), CC 67-Suc. 28 (C1428ZAA), Ciudad Autónoma de Bs. As., Argentina email: abuccino@iafe.uba.ar
Pablo J. D. Mauas
Affiliation:
Instituto de Astronomía y Física del Espacio (IAFE), CC 67-Suc. 28 (C1428ZAA), Ciudad Autónoma de Bs. As., Argentina email: abuccino@iafe.uba.ar
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Abstract

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Based on our large spectral database obtained at CASLEO Argentinian Observatory, we analyzed the relation between simultaneous measurements of Hα and Ca ii H+K fluxes. Although the correlation between both proxies is positive for the solar case, in 2007 our group found that while some stars exhibit correlations between Hα and the Ca ii lines, the slopes change from star to star, including cases where no correlation was found. To discern if this flux-flux relation depends on the level of activity of the star and if it is associated with the distribution of active regions in the stellar atmosphere, in this work we analyze the relation between Hα-Ca ii fluxes for the whole set of 44 G dwarf stars and individually for a subset of several solar-type stars of different level of activity.

Keywords

stars: activitylate-typeline: profilesmethods: statistical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S286: Comparative Magnetic Minima: Characterizing quiet times in the Sun and Stars , October 2011 , pp. 324 - 327
Copyright
Copyright © International Astronomical Union 2012

References

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