Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...234..277p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 234, no. 1-2, Aug. 1990, p. 277-283.
Astronomy and Astrophysics
Astrophysics
20
Chromosphere, Giant Stars, Late Stars, Stellar Activity, Stellar Evolution, Calcium, Emission Spectra, Hertzsprung-Russell Diagram, Red Giant Stars, Stellar Mass, Supergiant Stars
Scientific paper
Ca II K emission in a homogeneous sample of late-type giants and supergiants is analyzed. The Wilson-Bappu relationship and color-temperature scales are used to construct an H-R diagram which is compared with theoretical evolutionary tracks. It is shown that in spite of the errors involved in the determination of the fundamental stellar parameters, a clear relationship between chromospheric surface activity and stellar mass is present. 5-10 solar mass stars in He burning phase show the highest levels of activity; on the other hand, less massive stars ascending along the Red Giant Branch are extremely quiet. A correlation between surface activity and rotation is found, and it is shown that a knowledge of the stellar evolutionary history is essential for understanding chromospheric emission from evolved stars.
Brocato Enzo
Pallavicini Roberto
Pasquini Luca
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