Chromospheric decay and the ages of solar type stars

Details Chromospheric decay and the ages of solar type stars Chromospheric decay and the ages of solar type stars

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..210b&link_type=abstract

Astrophysical Journal, Part 1, vol. 247, July 1, 1981, p. 210-221.

Astronomy and Astrophysics

Astrophysics

32

Calibrating, Chromosphere, Star Clusters, Stellar Evolution, Stellar Models, Sun, Abundance, Galactic Evolution, Line Spectra, Metallic Stars, Solar Activity, Stellar Gravitation, Stellar Spectrophotometry, Stellar Winds

Scientific paper

A correlation is reported between the ages of solar type stars in six clusters and their K and H line central depths. This correlation suggests that chromospheric activity is being measured. The new method includes simple spectral measurements requiring lower resolution and consequently shorter observing times than previous methods. An effect on the H and K lines caused by the time decay of chronomospheric activity in solar type stars is illustrated in a graph. To the degree that the fraction of chromospheric energy losses through the H and K features remains constant in time, and the degree to which the response of KH0 to atmospheric structural changes is linear, these curves illustrate the decay of the chromospheric activity itself. It is generally believed that chromospheric activity is related to stellar rotational velocity. With the above reservations, and the assumption that the mean chromospheric activity level varies linearly with rotation, the graph indicates also the time rate of decrease of the rotational velocity for a solar type star.

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