Thin Disk Dynamical Heating and the Activity of Low Mass Dwarfs

Details Thin Disk Dynamical Heating and the Activity of Low Mass Dwarfs Thin Disk Dynamical Heating and the Activity of Low Mass Dwarfs

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20511402s&link_type=abstract

American Astronomical Society Meeting 205, #114.02; Bulletin of the American Astronomical Society, Vol. 36, p.1542

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a continuing analysis of the magnetic activity of thousands of M-dwarfs from the Sloan Digital Sky Survey (SDSS) and 2MASS. We confirm the trend described by West et al. (2004) that the fraction of active stars decreases as a function of vertical distance from the galactic plane. This result suggests that the older stars, which have undergone more dynamical heating, are also less likely to remain active, a further confirmation of an age-activity relation. We also investigate a possible variation in the amount of activity (as measured by LH-alpha/Lbol) as a function of distance from the plane and find that there is no statistically significant trend. These data imply that older stars continue to have the same distribution of activity until they cease being active.

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