Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..878h&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
Scientific paper
Stellar activity is closely connected to time-variable emission in Ca H & K lines. Since these lines are easily accessible with high sensitivity from ground-based telescopes they provide the means to most easily investigate activity cycles for a large number of stars. The analysis of suchlike profiles using the S-index is a well-known method to monitor stellar activity. Alternatively one can trace the signatures of chromospheric emission lines differentially using sophisticated theoretical line profiles. We have analysed Ca H and K spectra of a sample of G stars obtained with the ESO 3.6m CES system and present results from our analysis of chromospheric activity using PHOENIX models.
Hempel Maren
Kaiser Christian
Reiners Ansgar
Schmitt Juergen H. M. M.
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