Chromospheric activity and stellar evolution - Clues from IUE data

Details Chromospheric activity and stellar evolution - Clues from IUE data Chromospheric activity and stellar evolution - Clues from IUE data

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266..340p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 340-346.

Astronomy and Astrophysics

Astrophysics

8

Chromosphere, Cool Stars, Giant Stars, Stellar Activity, Stellar Atmospheres, Stellar Evolution, Hertzsprung-Russell Diagram, Iue, Metallicity, Stellar Mass, Stellar Temperature

Scientific paper

We investigate the dependence of chromospheric activity on stellar physical parameters in a sample of cool giants and supergiants. Ca II surface fluxes for stars of known masses and evolutionary status are derived from published IUE Mg II observations. Adding these data to the sample of Pasquini et al. (1990) we find that chromospheric activity in evolved stars is better described by two stellar parameters, and a tight relationship is found between activity, stellar Teff and Mass. We discuss this relationship arguing that the stellar evolutionary status could play a 'hidden' but fundamental role in determining the activity level of evolved late type stars.

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