Yazar "Albayrak, B" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
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    Öğe
    A light and period study of SV Camelopardalis
    (Edp Sciences S A, 2001) Albayrak, B; Demircan, O; Djurasevic, G; Erkapic, S; Ak, H
    New BVR light curves and times of minimum light for the short period RS CVn system SV Cam were analysed to derive the physical parameters of the system and the parameters of the third body orbit. The light curves obtained at the TUBITAK National Observatory during two nights in 2000 show considerable asymmetry and night-to-night variations. The analysis of the light curves is made using Djurasevic's inverse problem method. The Roche model with spotted areas on the hotter primary component yields a good fit to observations. The extensive series of published photoelectric minima times indicate that the eclipsing pair orbits around the common mass center of the triple system with a period of 41.32 yr.
  • [ X ]
    Öğe
    A photometric study of BO Canum Venaticorum
    (Wiley-V C H Verlag Gmbh, 2001) Albayrak, B; Müyesseroglu, Z; Özdemir, S
    Photometric BV light curves of BO CVn obtained in 1992 and new times of minima are presented. The primary minimum shows a transit, whereas the secondary minimum, shows an occultation. The system may be classified as an A-type W UMa system. A complete study of minima allows one to detect a possibly increasing period by about 0.037 s/yr. This indicates that the conservative mass transfer rate from the less massive component to the more massive one is 1.57 10(-10) M-circle dot/yr. Because of the variable period, the new ephemeris is determined for future observations. Using the Wilson-Devinney code a simultaneous solution of the B and V light curves is also performed. The analysis shows that the system is in a contact configuration with q = 0.205 +/-0.001 and fillout factor- (f) = 0.18, T-1 = 7240 K(fixed), T-2 = 7150 +/- 10 K. The high orbital inclination i = 87 degrees .54 +/-0.26 was confirmed by photometric observations of the secondary minimum.
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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.