Variation of stellar coronal activity with age |
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Authors: | P K Kunte A R Rao M N Vahia |
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Institution: | (1) Tata Institute of Fundamental Research, Colaba, Bombay, India;(2) Present address: DSRI, Lundtoftevej 7, Copenhagen, Denmark |
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Abstract: | We investigate the variation in coronal activity of late-type stars with age. We determine the age of the star from the colour-colour diagram (U-B vsB-V). We show that the ratio of X-ray luminosity (L
x) to bolometric luminosity (L
bol) is well correlated with age over several orders of magnitude variations. We find thatL
x/L
bol) decreases with age with a power of –1.55. This is consistant with the expected results from the studies of the variation of the corona with chromosphere and the dependence of chromosophere on age. |
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Keywords: | |
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