Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.2177k&link_type=abstract
Astronomical Journal v.109, p.2177
Astronomy and Astrophysics
Astronomy
12
Stars: Chromospheres, Binaries: Spectroscopic
Scientific paper
We studied seven different RS CVn-type binary star systems (zeta And, BL CVn, UV CrB, V826 Her, GX Lib, TZ Tri, and EE UMa) to look for suspected starspot activity. Each had been previously found variable due to the ellipticity effect. Although never established quantitatively, several had shown inklings of variability due to starspots. We determined, through analysis of all radial velocities available in the literature, a definitive orbital ephemeris for each. We analyzed all published photometry, as well as new photometry presented here. We removed the ellipticity effect by Fourier analysis and examined the remaining residuals for any variability characteristic of starspots, finding it in all seven, up to 0.09 mag in the extreme case. In the process, the photometry confirmed the best values for the orbital ephemerides and evaluated the depths of the two minima caused by ellipticity, slightly unequal due to the "pointed end" effect.
Barksdale William S.
Beck Sara J.
Chambliss Carlson R.
Eaton Joel A.
Fried Ralph E.
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