Short Period Variability Of An M-dwarf In SDSS Stripe-82

Details Short Period Variability Of An M-dwarf In SDSS Stripe-82 Short Period Variability Of An M-dwarf In SDSS Stripe-82

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21443007m&link_type=abstract

American Astronomical Society, AAS Meeting #214, #430.07; Bulletin of the American Astronomical Society, Vol. 41, p.701

Astronomy and Astrophysics

Astronomy

Scientific paper

We present analysis of a unique short-period object selected from the SDSS-II Stripe 82 photometric time-domain database. This object stands out in color-period space, having the colors and spectrum of an early M-dwarf (M0-M1) but a photometric period of 0.1 days, an amplitude of 0.2 magnitudes, and a sinusoidal lightcurve. It is unusual to find
such a red object with such a short period. We have obtained multiple epochs of spectroscopy with the MAGE spectrograph at Magellan to constrain any radial velocity variations. We examine the possible
interpretations of this system, including : an M-dwarf/M-dwarf eclipsing system, which would be near the Algol limit; stellar rotation with persistent star spots; and stellar pulsation.

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