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V502 Ophiuchi Çift Yıldız Sisteminin Işık Eğrisi ve Dönem Analizi (Seri B)

Journal Name:

  • Çankaya University Journal of Arts and Sciences

Publication Year:

  • 2009

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
BVR light curves of the eclipsing binary V502 Ophiuchi which are obtained at TÜBİTAK National Observatory in 2005 were analized with the aid of the PHOEBE analysis code to determine the physical parameters of the system. An updated mass ratio value was used during these analyses. The light curves of the W-type W UMa system V502 Oph were successfully modelled by assuming the existance of a solar-type cool spot on the surface of the primary component and up-to-date physical parameters of the system were determined. Moreover, additional photometric observations were perfomed at Ankara University Observatory in the year 2009 and new times of minima were derived. These new times of minima were combined together with the all published timings in the literature and an up-to-date period variaton analysis was also performed for the system. As a result of this analysis it was determined that the orbital period of the system is decreasing. Mass transfer between the component stars was suggested as the mechanism to explain this observed period decrease.
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Abstract (Original Language): 
V502 Ophiuchi örten çift yıldız sisteminin 2005 yılında TÜBİTAK Ulusal Gözlemevi'nde, BVR bantlarında elde edilen ışık eğrileri, sistemin fiziksel parametrelerini belirlemek üzere, güncel tayfsal kütle oranı da dikkate alınarak PHOEBE analiz programı ile modellendi. Analiz sonucunda W-türü bir W UMa sistemi olan V502 Oph'nin ışık eğrileri, birinci bileşen üzerinde güneş benzeri soğuk bir lekenin varlığı altında başarılı bir şekilde modellendi ve sisteme ilişkin güncel fiziksel parametreler hesaplandı. Ayrıca, Ankara Üniversitesi Rasathanesi'nde 2009 yılı içinde sistemin ek ışıkölçüm gözlemleri yapılarak yeni minimum zamanları elde edildi. Bu minimum zamanları, literatürden toplanan tüm yayınlanmış minimum zamanları ile birleştirildi ve sistem için güncel bir dönem değişimi analizi gerçekleştirildi. Bu analiz sonucunda ise sistemin yörünge döneminin azalmakta olduğu tespit edildi ve bu azalmaya neden olabilecek mekanizma için bileşenler arası kütle aktarımı önerildi.
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  • Turkish

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