Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasj...61..777l&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.61, No.4, pp.777--781
Astronomy and Astrophysics
Astronomy
2
Stars: Binaries: Close, Stars: Binaries: Eclipsing, Stars: Individuals (Zz Cassiopeiae), Stars: Multiple
Scientific paper
CCD observations of the eclipsing binary ZZ Cas were carried out during three nights from 2007 to 2008. Based on our new CCD times of light minimum and all available photoelectric and CCD data compiled from the literature, orbital period changes of ZZ Cas were analyzed. It was discovered that there may exist two cyclic variations (i.e., P3 = 13.63yr and A3 = 0.02406d, P4 = 3.89yr and A4 = 0.00295d). ZZ Cas is composed of early type component stars; the two cyclic variations can be explained by the light-time effect via the presence of the third and fourth bodies in the system. Minimal masses of M3 = 5.00Modot and M4 = 1.21 Modot were also calculated, respectively. These conclusions are in agreement with the result of previous investigations, that the additional bodies should contribute 23.6% to the total light of the system (Zasche 2009, New Astron., 14, 129), when the inclinations of the third and the fourth bodies are i3 = i4 = 58.9D. The third and fourth bodies orbit the eclipsing binary at orbital distances of a3 = 11.74AU and a4 = 6.14AU, respectively.
Liao Wen Ping
Qian Sheng Bang
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