Magnetic Activity in Low Mass Stars: SDSS Results

Details Magnetic Activity in Low Mass Stars: SDSS Results Magnetic Activity in Low Mass Stars: SDSS Results

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.1604h&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #16.04; Bulletin of the American Astronomical Society, Vol. 34, p.1125

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a study of the magnetic activity properties of low-mass stars in the Sloan Digital Sky Survey. Using the Hα emission line as an activity indicator, we examine the fraction of active stars as a function of spectral type and find a peak near type M7, confirming previous results. We investigate the ratio of the luminosity emitted in Hα compared to the bolometric luminosity for each star, and find a roughly constant ratio (with large scatter) over the range M0-M9. There does not appear to be a decrease in the ratio for types M8-M9, in contrast to previous determinations. We also explore the effect of metallicity on activity, and examine whether activity is correlated with changes in the SDSS colors.

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