Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92..717b&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 92, Oct.-Nov. 1980, p. 717-724.
Astronomy and Astrophysics
Astronomy
61
Binary Stars, Light Curve, Stellar Spectrophotometry, Surface Properties, Asymmetry, Stellar Models, Stellar Temperature, Ultraviolet Astronomy
Scientific paper
The feasibility of applying the star-spot model to explain the unusual asymmetric light curves exhibited by the noneclipsing RS CVn-like binaries lambda And and II Peg is examined. A simple spot model incorporating two cool dark regions separated by 40-100 degrees in longitude and with size ratio approximately 2 to 1 can reproduce the observed light variations to a precision of approximately 0.01 m. For lambda And, two-color photometry obtained by Guinan shows a markedly different amplitude in the ultraviolet compared with the red, and permits us to establish a temperature difference delta T between photosphere and spot of approximately 800 K.
Bopp Bernard William
Noah Paul V.
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