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Five years of photometry of λ andromedae |
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| Authors: | R W Boyd J A Eaton D S Hall G W Henry R M Genet L P Lovell J L Hopkins J D Sabia K Krisciunas C R Chambliss P K Detterline H J Landis H Louth T R Renner D R Skillman R E Montle |
| Institution: | 1. Boyd Observatory, Miami, Florida, USA 2. Dyer Observatory, Vanderbilt University, Nashville, USA 4. Fairborn Observatory, Fairborn, Ohio, USA 5. Hickox Observatory, Chagrin Falls, Ohio, USA 6. Hopkins-Phoenix Observatory, Phoenix, Arizona, USA 7. Keystone Junior College Observatory, Scranton, Pennsylvania, USA 8. Krisciunas Observatory, San Jose, California, USA 9. Kutztown State College Observatory, Kutztown, Pennsylvania, USA 10. Landis Observatory, Locust Grove, Georgia, USA 11. Louth Observatory, Sedro Woolley, Washington, USA 12. Scuppernong Observatory, Dousman, Wisconsin, USA 13. Skillman Observatory, College Park, Maryland, USA 14. Veen Observatory, Grand Rapids, Michigan, USA |
| 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 3 m .70<V<4 m .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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