The discontinuous nature of chromospheric activity evolution

Details The discontinuous nature of chromospheric activity evolution The discontinuous nature of chromospheric activity evolution

2010-02-12

arxiv.org/abs/1002.2567v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, 1 figure, to be published in Astrophysics and Space Science

Scientific paper

10.1007/s10509-010-0310-5

Chromospheric activity has been thought to decay smoothly with time and, hence, to be a viable age indicator. Measurements in solar type stars in open clusters seem to point to a different conclusion: chromospheric activity undergoes a fast transition from Hyades level to that of the Sun after about 1 Gyr of main--sequence lifetime and any decaying trend before or after this transition must be much less significant than the short term variations.

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