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Starspot Activities as an Interpretation for the Light Curve Changes of the Close Binary Star XY UMa [chapter]

E. H. Geyer
1976 Structure and Evolution of Close Binary Systems  

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The large light curve changes of XY UMa, observed in the last 20 yr, are interpreted as stellar starspot activity of the primary component of this binary. The 0.4799-day eclipsing binary XY UMa is a unique star as far as its photometric hehaviour is concerned. Shortly after its variability was found by Strohmeier, and its period determined by Kippenhahn (Geyer et al, 1955) I started photoelectric observations, mainly in B and V, of this object and sporadically continued them up to 1975. Eight
more » ... irly complete light curves have been obtained in the years 1955, 1956, 1957, 1958, 1959, 1961,1968 and 1975. They show not only large variations between consecutive observing nights, but also that the character of the light curves underwent severe changes within this 20-yr period of photoelectric observation. P. EggletonetaL (eds.), Structure and Evolution of Close Binary Systems, 313-316. All Rights Reserved.
doi:10.1007/978-94-010-1483-0_31 fatcat:cjdrokracrep3dp7yhnbrm7j2q
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E. H. Geyer. "Starspot Activities as an Interpretation for the Light Curve Changes of the Close Binary Star XY UMa." Structure and Evolution of Close Binary Systems (1976) 313-316