Astrophysics and Space Science

, Volume 162, Issue 2, pp 211–234 | Cite as

A photometric light variation and a 1500 days secondary period in the W UMa system TZ bootis

  • Nabil S. Awadalla
Article

Abstract

Photoelectric observations of the eclipsing variable TZ Bootis, obtained in 1983 and 1986, in the two coloursB andV 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 solar-like 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 obtaiend assuming a linear trend in the (O-C)s. The star may be classified to A-type W UMa systems.

Keywords

Linear Trend Light Curve Activity Cycle Light Curf Curve Change 

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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Nabil S. Awadalla
    • 1
    • 2
  1. 1.Physics DepartmentUniversity of BahrainBahrainEgypt
  2. 2.Helwan Institute of Astronomy and GeophysicsCairoEgypt

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