Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..813l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. Vol. 226, No. 4, p. 813 - 827
Astronomy and Astrophysics
Astronomy
6
Close Binaries:Stellar Activity, Late-Type Giants:Starspots, Starspots:Late-Type Giants, Stellar Activity:Calcium Lines, Stellar Activity:Close Binaries, Stellar Activity:Stellar Rotation, Stellar Rotation:Stellar Activity
Scientific paper
HD 158393 is a giant star of spectral type late G or early K which has moderately strong Ca II H and K emission cores. UBVRIJHK photometry and IUE spectra reveal a companion of type F0 - F2, luminosity class IV or V. Radial velocity data yield an orbit with a period of 31 day. The K and F stars have nearly equal mass, with a minimum value of 1.7 M_sun;. The strong Ca II emission indicates an enhanced chromospheric activity which is typical of giant stars in a binary system of this period, and the light is variable in a 31-day period indicative of synchronous rotation as well as on a long time-scale. Analysis of the 31-day light period by fitting a spot model indicates the presence of two spots in 1975 and 1976. The two spots showed different periods and were at different latitudes, suggesting differential rotation of the giant star.
Balona Luis A.
Evans Tom Lloyd
Fekel Francis C.
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