Stellar activity and the Wilson-Bappu relation.

Details Stellar activity and the Wilson-Bappu relation. Stellar activity and the Wilson-Bappu relation.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...326..165e&link_type=abstract

Astronomy and Astrophysics, v.326, p.165-176

Astronomy and Astrophysics

Astrophysics

9

Stars, Chromospheres, Coronae, Activity

Scientific paper

The MgII h and k lines of 78 single stars observed with the International Ultraviolet Explorer (IUE) observatory have been analyzed. Stars of spectral classes F, G, K and M and luminosity classes I-V are represented in the sample. From these data it is shown that the Wilson-Bappu relation for the Mg II h and k lines is fulfilled over a range of 18 magnitudes, i.e. from M_v_=+12 to M_v_=-6. The sample contains slowly rotating stars of different activity levels and is suitable for investigations of a possible relation between line width and stellar activity. It is found that active stars have broader lines and show a larger variation in line widths than quiet stars. Observations of the active RS CVn binary σ Gem taken at epochs when it shows different levels of activity, clearly demonstrate line broadening following higher activity. Possible implications of the new results for the interpretation of the Wilson-Bappu relation are briefly discussed.

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