Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...425l..25h&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 425, no. 1, p. L25-L27
Astronomy and Astrophysics
Astronomy
7
Infrared Astronomy, Infrared Radiation, Infrared Stars, Pre-Main Sequence Stars, Starspots, Stellar Envelopes, Stellar Rotation, Variable Stars, Astronomical Photometry, Dynamo Theory, Infrared Astronomy Satellite, Stellar Convection, Stellar Magnetic Fields
Scientific paper
The dusty infrared-excess star HD 98800 (K5 V) was observed for several weeks in the spring of 1993 by the Vanderbilt/Tennessee State 0.4 m automatic photoelectric telescope. It was found to be a variable star with an amplitude of 0.07 mag in V and a period of 14.7 days. We show, by comparison with other chromospherically active variable stars and constant stars with good observational histories, that the Rossby number for HD 98800, determined to be 0.30, places it well within the regime of stars whose convective envelopes and rotation rates combine to drive a magnetic dynamo strong enough to generate photometrically observable starspots. The light curve suggests at least two large spots at somewhat different longitudes on HD 98800, one of which could be as large as 16 deg in radius.
Hall Douglas S.
Henry Gregory W.
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