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A Semi-Detached Binary with a Spotted Primary Star

10 Jul 2014, 22:00 UTC
A Semi-Detached Binary with a Spotted Primary Star
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Figure 1: Artist’s impression of what “twin Suns” might look like from the surface of a circumbinary planet.Photometric observations of NR Pegasi by A. Erdem et al. (2014) in 2007 and 2008 show that it is a highly active semi-detached binary star system. The primary and secondary stars of the binary system are estimated to be 1.60 ± 0.03 and 0.57 ± 0.02 times the Sun’s mass, 3.35 ± 0.07 and 3.55 ± 0.08 times the Sun’s radius, and 9.10 ± 1.78 and 3.47 ± 0.93 times the Sun’s luminosity, respectively. Both the primary and secondary stars also have respective surface temperatures of 5485 ± 200 K and 4186 ± 241 K. The binary system has an orbital period of 3.3978 days. NR Pegasi is an eclipsing binary system where the primary star blocks part of the secondary star and vice versa during each orbit. As a result, the observed brightness of NR Pegasi varies with time.Light curves of NR Pegasi obtained in 2007 and 2008 show large asymmetries, and variations could be seen in the light curves from night to night. For example, the depth of the primary minimum (i.e. the secondary star passing in front of and blocking ...

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