Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991japa...12..281h&link_type=abstract
Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 12, no. 4, Dec. 1991, p. 281-287.
Astronomy and Astrophysics
Astrophysics
8
Andromeda Galaxy, Astronomical Photometry, Binary Stars, Electrophotometry, Light Curve, Astronomical Catalogs, Stellar Activity, Stellar Models, Telescopes
Scientific paper
The paper presents photoelectric photometry of Lambda And never before published, obtained between February 1982 and December 1990 at 29 different observatories. Then it is combined with all other photometry available (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 0.15 m and a period of 11.4 +/- 0.4 years. Because most of the new photometry was concentrated in the 1983-1984 observing season, this one well-defined light curve is analyzed with a two-spot model. Spot A keeps a 0.04 m amplitude throughout four rotation cycles whereas the amplitude of spot B diminishes from 0.09 m down almost to 0.03 m. The spot rotation periods were 55.9 d +/- 0.6 d and 52.8 d +/- 1.0 d, respectively.
Boehme Dietmar
Brooks Peter A.
Chang Sandy
Dolzan Ales
Fortier George L.
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