Abstract
We present photoelectric photometry of this bright long-period RS CVn binary and use it, along with earlier photometry, to derive the photometric period and discuss the changing light curve shape. The best ephemeris for times of minimum light is 2443829.2+53.d95E. Because times of minimum and maximum extending back to those of Calder in 1933–37 can be phased together properly, the principal dark region must have maintained its identify for almost 50 yr. Over the last five years the brightness range has been 3m.70<V<4m.05. During 1980–81 shallow secondary minima developed at phases where maxima occurred in previous years. λ And remains the only wellestablished case of non synchronous rotation among the known RS CVn binaries.
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Guest Observer, Kitt Peak National Observatory, operated by the Association of Universities for Research in Astronomy, under contract with the National Science Foundation.
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Boyd, R.W., Eaton, J.A., Hall, D.S. et al. Five years of photometry of λ andromedae. Astrophys Space Sci 90, 197–206 (1983). https://doi.org/10.1007/BF00651560
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DOI: https://doi.org/10.1007/BF00651560