Abstract
The visual triple system HD 9770 (BB Scl) has been the subject of a four-year programme of UVB(RI)C photometry and Hαechelle spectroscopy. Analysis of the data obtained over that period shows that star B, and probably also star A, of HD 9770 is a binary. The A system comprises a K1V star, which may be in a binary system with another K dwarf. The B system is an eclipsing binary of the BY Dra type in which both stars are chromospherically active. An orbital period of 0.476 525±0.000 013 d has been derived from the light curve in V. Physical parameters derived from analysis of the light curves in UBV(RI)C are presented.
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