SPOT cycles in the RS CVn variable AY CET

Details SPOT cycles in the RS CVn variable AY CET SPOT cycles in the RS CVn variable AY CET

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...157....1p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 157, no. 1, March 1986, p. 1-5. Sponsorship: Indian Space Research Organizatio

Astronomy and Astrophysics

Astrophysics

8

Binary Stars, Periodic Variations, Starspots, Stellar Spectrophotometry, Ubv Spectra, Variable Stars, Light Curve, Orbital Elements, Radial Velocity, Spectral Energy Distribution, Spectrum Analysis, Stellar Luminosity, White Dwarf Stars

Scientific paper

New UBV photometry of AY Cet from 1981-82, 1982-83, and 1983-84 is presented and analyzed along with previously collected data. Various period-finding and curve-fitting techniques are used to describe the progressive damping of the sine wave and the progressive brightening of the mean luminosity. The model is developed of a group of starspots concentrated on one hemisphere and whose area gradually gets smaller. The V data between 1980 and 1984 are represented as a combination of three sine curves. The 77-day period produces a variation whose full amplitude in V decreases from 0.22 mag in 1980-81 to 0.12 mag in 1983-84, while the mean V magnitude brightens gradually by about 0.12 mag. B-V and U-B remain constant over the rotation period of the G5 III spectroscopy primary, but, as the mean brightness increases, B-V becomes more negative while U-B becomes more positive. An orbital period of 57.1 d is determined, and AY Cet is confirmed as the second example of clearly asynchronous rotation in an RS CVn binary.

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