Variation of stellar coronal activity with age

Details Variation of stellar coronal activity with age Variation of stellar coronal activity with age

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.143..207k&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 143, no. 1, April 1988, p. 207-210.

Astronomy and Astrophysics

Astrophysics

6

Color-Color Diagram, Late Stars, Main Sequence Stars, Stellar Activity, Stellar Coronas, Stellar Luminosity, Stellar Atmospheres, Stellar Flares, Stellar Rotation, Variable Stars

Scientific paper

The authors investigate the variation in coronal activity of late-type stars with age. They determine the age of the star from the colour-colour diagram (U-B vs B-V). They show that the ratio of X-ray luminosity (Lx) to bolometric luminosity (Lbol) is well correlated with age over several orders of magnitude variations. It is found that Lx/Lbol decreases with age with a power of -1.55. This is consistent with the expected results from the studies of the variation of the corona with chromosphere and the dependence of chromosphere on age.

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