Time Variability of the Ca II K Emission Line of Giants

Details Time Variability of the Ca II K Emission Line of Giants Time Variability of the Ca II K Emission Line of Giants

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pasp..120..730s&link_type=abstract

Publications of the Astronomical Society of the Pacific, Volume 120, issue 869, pp.730-739

Astronomy and Astrophysics

Astronomy

1

Stars

Scientific paper

This paper reports the results of a program to search for evidence of time variability in the profile of the central emission component of the Ca II K line of a sample of Population I field giant stars. High resolution spectra of this line have been obtained using echelle and coudé spectrographs on the 82-inch (2.1-m) and 107-inch (2.7-m) telescopes of McDonald Observatory. Data are drawn from previous papers of Smith & Shetrone and combined with new observations obtained during the period 2004-2007 to give multiple observations for a sample of 31 evolved giant stars extending over the period 1998-2007. The asymmetry of the Ca II & lt; 1.0.

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