Yazar "Degirmenci, ÖL" seçeneğine göre listele

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    Photometric analysis of the eclipsing binary star AI Draconis
    (Edp Sciences S A, 2000) Degirmenci, ÖL; Gülmen, Ö; Sezer, C; Erdem, A; Devlen, A
    New photometric data from the eclipsing binary star AI Draconis has been analyzed with the method of Wilson-Devinney. The system shows a period increase of about 0.91 sec per century, which corresponds to amass transfer from the less to the more massive component at a rate of 7.5 10(-7) M./yr under the conservative mass transfer hypothesis. We also suggest that the system has an unseen component which orbits around the mass center of the triplet system with a period of about 23 yrs. We found that the projectional angular separation between the third star and eclipsing pair varies from 0. 048 to 0. 235. These results suggestive of a third body should be checked in the future with more sensitive observations.
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    Öğe
    The early type contact binary system V 382 Cygni
    (E D P Sciences, 1999) Degirmenci, ÖL; Sezer, C; Demircan, O; Erdem, A; Özdemir, S; Ak, H; Albayrak, B
    New photometric data set of the early type contact binary V382 Cyg have been analyzed with emphasis on determining the photometric mass ratio of the system. The result (q = 0.68) supports the value given by Popper & Hill (1991). A study of the system using new data shows a period increase of about 3.28 s per century, which corresponds to a very large rate similar to 5.0 10(-6) M./yr of mass transfer from the less massive to the more massive component under the conservative mass transfer hypothesis.