Two New Spotted Variables-HD 191262 and HD 191011

Details Two New Spotted Variables-HD 191262 and HD 191011 Two New Spotted Variables-HD 191262 and HD 191011

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1936h&link_type=abstract

Astronomical Journal v.104, p.1936

Astronomy and Astrophysics

Astronomy

4

Binaries: Spectroscopic, Stars: Chromospheres

Scientific paper

New 1988-1990 photometry in V and B with a 16 inch automatic telescope shows that both HD 191262, a previously known chromospherically active binary, and its comparison star HD 191011 are variable, with starspots judged to be the mechanism in both. In HD 191262 and 191011, respectively, spot rotation periods of 5d.4 < P < 5d.7 and 1 7d.4 < P < 23d.0 were found and differential rotation coefficients of k=0.054 and 0.28 were estimated. HD 191011, shown to be a KS giant about 475 parsecs away, had eight different spots present during the 2.5 years of observation.

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