Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.162..211a&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 162, no. 2, Dec. 1989, p. 211-234.
Astronomy and Astrophysics
Astrophysics
10
Eclipsing Binary Stars, Electrophotometry, Light Curve, Stellar Spectrophotometry, Variable Stars, Absorption Spectra, Line Spectra, Solar Activity, Solar Cycles
Scientific paper
Photoelectric observations of the eclipsing variable TZ Bootis, obtained in 1983 and 1986 in two colors, B and V, are presented. They are compared with the previous light curves of the system. The light curve changes show that the system TZ Bootis has a solarlike activity cycle with a period of 1500 days. The primary shows a transit, whereas the secondary shows an occultation minima. The maxima exhibit a large difference, suggesting a large complication in the system. The (O-C) trend indicates that the period did not remain constant; a satisfactory representation of all the observed time of minimum light was obtained assuming a linear trend in the (O-C)s. The star may be classified as belonging to A-type W UMa systems.
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