The Age-Activity Relation for M dwarfs Using 25,000 SDSS Spectra

Details The Age-Activity Relation for M dwarfs Using 25,000 SDSS Spectra The Age-Activity Relation for M dwarfs Using 25,000 SDSS Spectra

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8906h&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #89.06; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

The age at which strong surface magnetic activity ceases in M dwarfs has been inferred to have a strong dependence on mass (spectral type, surface temperature) to explain previous results showing a large increase in the fraction of active stars at later spectral types. Using spectral observations of 25,000 M dwarfs in the SDSS, we show that the fraction of active stars decreases as a function of vertical distance from the Galactic plane, and that the magnitude of this decrease changes significantly for different M spectral types. Adopting a simple dynamical model for thin disk vertical heating, we assign an age for the activity decline at each spectral type, and thus determine an activity-age relation for M dwarfs. These results provide constraints for dynamo models that seek to describe the production of surface magnetic fields in low mass stars.

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