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Variation of stellar coronal activity with age

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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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Author notes

  1. A. R. Rao

    Present address: DSRI, Lundtoftevej 7, Copenhagen, Denmark

Authors and Affiliations

  1. Tata Institute of Fundamental Research, Colaba, Bombay, India

    P. K. Kunte, A. R. Rao & M. N. Vahia

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  1. P. K. Kunte
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  2. A. R. Rao
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  3. M. N. Vahia
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Kunte, P.K., Rao, A.R. & Vahia, M.N. Variation of stellar coronal activity with age. Astrophys Space Sci 143, 207–210 (1988). https://doi.org/10.1007/BF00636769

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  • DOI: https://doi.org/10.1007/BF00636769

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