Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979s%26t....57..132z&link_type=abstract
Sky and Telescope, vol. 57, Feb. 1979, p. 132-137.
Astronomy and Astrophysics
Astronomy
4
Astronomical Photometry, Eclipsing Binary Stars, Light Curve, Radio Spectroscopy, Starspots, Stellar Motions, Stellar Spectra, Calcium, Radio Bursts, Radio Sources (Astronomy), Stellar Temperature, Variable Stars, X Ray Sources
Scientific paper
Observations of the strange phenomena in the RS CVn binary stars are reported, noting especially the mysterious wave with an amplitude of about 0.1 magnitude which migrates along its light curve, bright lines of singly ionized calcium, X-rays of an intense glow, and cyclic radio bursts. Particular attention is given to the great radio burst of HR 1099 on February 20, 1978 and its related phenomena. A model of stellar phenomena which can explain the observations is the one proposed by Hall in 1972 in which huge spots or spot groups about 1000 K cooler than the surrounding photosphere would cover about 20% of the star's surface, and where these spots or spot groups are distributed nonuniformly in longitude. It has been found that the starspot model reproduces many of the observed phenomena in RS CVn systems, but it fails to explain why the spots prefer to gather in one hemisphere. To recognize the still unknown RS CVn binaries stellar models that emit X-rays have been proposed.
Feldman Paul A.
Hall David S.
Walter Fabian
Zeilik Michael
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