Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86..433n&link_type=abstract
Astronomical Journal, vol. 86, Mar. 1981, p. 433-437.
Astronomy and Astrophysics
Astronomy
32
Binary Stars, Light Curve, Stellar Spectrophotometry, H Alpha Line, Starspots, Stellar Magnitude, Stellar Models, Stellar Temperature, Ubv Spectra
Scientific paper
BVRI photometric observations of the RS CVn binary II Peg are presented and interpreted in terms of the starspot model for RS CVn binaries. Observations were obtained in the Johnson B and Cousins VRI systems with a 16-in. telescope in conjunction with a single-channel pulse-counting photometer. The present light curves are observed to differ dramatically from those observed in 1977, in exhibiting two unequal maxima separated by approximately 0.55 in. orbital phase and a mean V magnitude of 7.52. When interpreted in terms of the starspot model, the light curves obtained indicate a temperature difference between the spots and the surrounding photosphere of 1100 + or - 450 K and 0.27 + or - 0.10 of the visible disk to be covered by the spots. The Barnes-Evans visual surface brightness relation is used to derive a minimum radius of 2.19 + 0.37 or - 0.31 solar radii for the primary, confirming a previous finding that the star is located considerably above the main sequence. It is recommended that II Peg be observed every season in order to determine the time evolution of the spot groups
Nations Harold L.
Ramsey Lawrence W.
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