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New 1982 — 1990 photometry of λ Andromedae and its 11-year cycle
Authors:Douglas S Hall  Gregory W Henry  Dietmar Böhme  Peter A Brooks  Sandy Chang  Ales Dolzan  George L Fortier  Robert E Fried  Russell M Genet  Bruce S Grim  James Hannon  Darrel B Hoff  Kevin Krisciunas  Howard J Landis  Howard P Louth  Larry P Lovell  Paul Nielsen  Bobby E Powell  Harry D Powell  Don Pray  Thomas R Renner  Charles W Rogers  Stephen Shervais  Douglas M Slauson  Samuel Slote  Harold J Stelzer  Arthur J Stokes  Jack C Troeger  Louis C Turner  Norman F Wasson  Kenneth W Zeigler
Institution:(1) Dyer Observatory, Vanderbilt University, 37235 Nashville, Tennessee, USA;(2) Center of Excellence in Information Systems, Tennessee State University, 37203 Nashville, Tennessee, USA;(3) 4851 Nessa, PSF 93, Germany;(4) 31 South 17th Street, 18042 Easton, Pennsylvania, USA;(5) 3249 Kingsbridge Avenue, 10463 Bronx, New York, USA;(6) Zasavska 88, 61231 Ljubljana, Yugoslavia;(7) 63 Devon Road, H9X 2W7 Baied’Urfe, Quebec, Canada;(8) P.O. Box 906, 86002 Flagstaff, Arizona, USA;(9) 3435 East Edgewood Avenue, 85204 Mesa, Arizona, USA;(10) 504 Country Club, Stansbury Park, 84074 Utah, USA;(11) 63 Treadwell Avenue, 06787 Thomaston, Connecticut, USA;(12) Department of Astronomy, University of Northern Iowa, 50614 Cedar Falls, Iowa, USA;(13) Joint Astronomy Centre, 665 Komohana Street, 96720 Hilo, Hawaii, USA;(14) 50 Price Road West, 30248 Locust Grove, Georgia, USA;(15) 2199 Hathaway Road, 98384 Sedro Woolley, Washington, USA;(16) 18410 Munn Road, 44022 Chagrin Falls, Ohio, USA;(17) 18I7 Shipley Road, 19803 Wilmington, Delaware, USA;(18) Department of Physics, West Georgia College, 30118 Carrollton, Georgia, USA;(19) Department of Physics, East Tennessee State University, 37614 Johnson City, Tennessee, USA;(20) 40 Hillcrest Drive, 02920 Cranston, Rhode Island, USA;(21) 4512 Deerpark Drive, 53118 Dousman, Wisconsin, USA;(22) Department of Physics, Southwest Oklahoma State University, 73096 Weatherford, Oklahoma, USA;(23) 14581 Leary Street, 22123 Nokesville, Virginia, USA;(24) 73 Summit Avenue, Route 1, Box 383, 52338 Swisher, Iowa, USA;(25) 50 East 72nd Street, 10021 New York, USA;(26) 1223 Ashland Avenue, 60305 River Forest, Illinois, USA;(27) Box 398 Hudson, Ohio 44236, USA;(28) 1009 16th Street, 50010 Ames, Iowa, USA;(29) Western Reserve Academy, 44236 Hudson, Ohio, USA;(30) 15870 Del Prado Drive, 91745 Hacienda Heights, California, USA;(31) P.O. Box 362, 85532 Claypool, Arizona, USA
Abstract:We present photoelectric photometry of λ And never before published, obtained between February 1982 and December 1990 at 29 different observatories. Then we combine it with all other photometry available to us (previously published, contained in the I.A.U. Commission 27 Archives, and obtained with the Vanderbilt 16-inch automatic telescope but not yet published), to yield a 14.8-year data base. Analysis reveals a long-term cycle in mean brightness, with a full range of 0m.15 and a period of 11.4 ± 0.4 years. Because most of our new photometry was concentrated in the 1983-84 observing season, we analyze that one well-defined light curve with a two-spot model. Spot A keeps a 0m.04 amplitude throughout four rotation cycles whereas the amplitude of spot B diminishes from 0m.09 down almost to 0m.03. The spot rotation periods were 55d.9 ± 0d.6 and 520d.8 ± 1d.0, respectively.
Keywords:binaries  RS CVn stars  stars  individual
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