Time Variation in the Magnetic Activity of Cool Stars

Details Time Variation in the Magnetic Activity of Cool Stars Time Variation in the Magnetic Activity of Cool Stars

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8904w&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #89.04; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present results from the analysis of multi-epoch, spectral observations of magnetically active M-dwarfs. Using data from the California and Carnegie Planet Search Program, the Sloan Digital Sky Survey, and follow-up observations at Apache Point Observatory, we examine the time variation of chromospheric magnetic activity (as traced by the H-alpha, H-beta and Calcium K emission lines). We investigate the amplitude of activity variation in individual stars and compare this to the spread in activity seen in large SDSS samples of M-dwarfs. The data suggest that the activity variation of individual stars cannot explain the range of activity seen in the SDSS sample, indicating there is an intrinsic spread of activity strength in the M-dwarf population. In addition, we examine differences in the observed activity variation between the measured emission lines. Our analysis puts important constraints on the range of chromospheric temperatures predicted from models of M-dwarf dynamos.

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