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PHOTOELECTRIC PHOTOMETRY OF THE RS CANUM VENATICORUM-TYPE CLOSE BINARY AR LACERTAE

IL-SEONG NHA and YOUNG-WOON KANG
Publications of the Astronomical Society of the Pacific
Vol. 94, No. 559 (June 1982), pp. 496-514
Stable URL: http://www.jstor.org/stable/40677984
Page Count: 19
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
PHOTOELECTRIC PHOTOMETRY OF THE RS CANUM VENATICORUM-TYPE CLOSE BINARY AR LACERTAE
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Abstract

The strongly interacting binary star AR Lac was observed for two years, 1976 and 1977, during which a total of 235 observations for the check star (BD + 44°4041) and a total of 1327 observations for AR Lac were made in two colors. The yellow light curve of the check star and the yellow and blue light curves and the color curve of AR Lac are presented. The depth of the primary minimum in the yellow light shows no variation in any one year but 0.08 magnitude difference between the two years. This indicates a long-term light variation of the K0 component of AR Lac. Nine new times of minimum light, five in 1969-72 and four in 1976-77, were determined. Although the first five times of minima agree with those of Chambliss' observations, the last four times of minima show that the orbital period has been constant over ten years since 1967 but should be decreased by 0ṍ0000070 from his value. As an explanation for the cause of the light variability, tests have been made for the star-spot model and for the shell model, but neither of these satisfies either the color variation during the primary eclipse or the constant color outside eclipses.

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