[16.04] Magnetic Activity in Low Mass Stars: SDSS Results

AAS 201st Meeting, January, 2003
Session 16. Stars in SDSS
Poster, Monday, January 6, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[16.04] Magnetic Activity in Low Mass Stars: SDSS Results

S. L. Hawley, A. A. West, K. R. Covey, S. N. Raymond, L. M. Walkowicz (University of Washington)

We present a study of the magnetic activity properties of low-mass stars in the Sloan Digital Sky Survey. Using the H\alpha 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 H\alpha 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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