Bezbednosna Politika Eu U Savremenoj Teoriji Međunarodnih Odnosa

Vukasović, Dejana

doi:10.22182/spm.2712010.3

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2012

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“…Photoelectric observations are abbreviated by "pe" while "pg" and "ccd" refers to the photographic and CCD observations. Light curves are LC1: Payne-Gaposchkin (1935), LC2: Liau (1935), LC3: Pierce (1939), LC4: Popper (1957), LC5: Ovenden (1954), LC6: Mannino (1963), LC7: Sezer et al (1993), LC8: Rovithis et al (1990), LC9: Oprescu et al (1996), LC10: Jassur (1997), LC11: Rovithis-Livaniou et al (1997), LC12: Edalati and Atighi (1997), LC13: Vukasović 1997, LC14: Oh et al (2000, LC15: Zabihinpoor et al (2006)…”

Section: Discussionmentioning

confidence: 99%

Close binary system GO Cyg

Ulaş¹,

Kalomeni²,

Keskin³

et al. 2012

New Astronomy

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a b s t r a c tIn this study, we present long term photometric variations of the close binary system GO Cyg. Modelling of the system shows that the primary is filling Roche lobe and the secondary of the system is almost filling its Roche lobe. The physical parameters of the system are M 1 = 3.0 ± 0.2M , M 2 = 1.3 ± 0.1M , R 1 = 2.50 ± 0.12R , R 2 = 1.75 ± 0.09R , L 1 = 64 ± 9L , L 2 = 4.9 ± 0.7L , and a = 5.5 ± 0.3R . Our results show that GO Cyg is the most massive system near contact binary (NCB). Analysis of times of the minima shows a sinusoidal variation with a period of 92.3 ± 0.5 yr due to a third body whose mass is less than 2.3M . Finally a period variation rate of À1.4 Â 10 À9 d/yr has been determined using all available light curves.

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