Yazar "Alan, Neslihan" seçeneğine göre listele

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  • Küçük Resim
    Öğe
    First photometric investigation of V517 Cam combined with ground-based and TESS data
    (Elsevier, 2025) Alan, Neslihan; Aliçavuş, Fahri; Alpsoy, Mehmet
    The observations of eclipsing binary systems are of great importance in astrophysics, as they allow direct measurements of fundamental stellar parameters. By analysing high-quality space-based observations with ground-based photometric data, it becomes possible to detect these fundamental parameters with greater precision using multicolour photometry. Here, we report the first photometric analysis results of the V517 Cam eclipsing binary system by combining the Transiting Exoplanet Survey Satellite ( TESS ) light curve and new CCD observations in BVRI filters, obtained with a 60 cm robotic telescope (T60) at the T & Uuml;B & Idot;TAK National Observatory. By means of photometric analyses, the masses and radii of the primary and secondary stars were carefully determined to be M1 = 1.47 +/- 0.06 M ae, M2 = 0.79 +/- 0.05 M ae, and R1 = 1.43 +/- 0.03 R ae, R2 = 0.75 +/- 0.04 R ae, respectively. Furthermore, the distance to V517 Cam was calculated to be 284 +/- 20 pc. The overall age of the system is estimated to be around 63 +/- 15 Myr. At this age, the primary component stands near the onset of its main-sequence evolution, near the ZAMS, whereas the secondary component remains in the pre-main- sequence evolutionary phase. To better understand the evolutionary status and nature of V517 Cam, the mass ratio and temperature values, obtained with relatively low sensitivity by photometric measurements, need to be confirmed by spectral analysis.
  • [ X ]
    Öğe
    Updated absolute parameters and kinematics of IS CMa
    (Wiley-V C H Verlag Gmbh, 2024) Evcil, Serkan; Adalali, Simge; Alan, Neslihan; Canbay, Remziye; Bilir, Selcuk
    Eclipsing binary systems are significant objects for astrophysics in that direct observations can determine the fundamental parameters of stars. In this study, we precisely determined the fundamental parameters of the binary component stars obtained by simultaneous analysis of radial velocities and the TESS light curve using the Wilson and Devinney code. Following the analysis, the masses and radii of the primary and secondary components were determined as M1 = 1.58 +/- 0.01M(circle dot), M-2 = 0.48 +/- 0.02M(circle dot), and R-1 = 1.93 +/- 0.01R(circle dot), R-2 = 1.14 +/- 0.01R(circle dot), respectively. Furthermore, the distance of IS CMa is calculated as 92.7 +/- 6.5$$ 92.7\pm 6.5 $$ pc. On the basis of the analysis of the mid-eclipse times, it was found that the variation in the orbital period is represented by an upward parabola. It has an increasing rate of dP/dt = 1.09 x 10(-7). Using PARSEC stellar evolutionary tracks and isochrones with solar metallicity estimated the age of IS CMa as 1.3 +/- 0.1 Gyr. Kinematic and Galactic orbital parameters of IS CMa were obtained from the astrometric and spectroscopic data of the system. The Galactic orbit analysis reveals that IS CMa formed inside the solar circle and it is a member of the young thin-disc population.