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Salmanzadeh E.,International Occultation Timing Association Middle East Section IOTA ME | Zandian S.,International Occultation Timing Association Middle East Section IOTA ME | Hasanzadeh A.,International Occultation Timing Association Middle East Section IOTA ME | Hasanzadeh A.,Research Institute for Astronomy and Astrophysics of Maragha RIAAM | And 2 more authors.
New Astronomy | Year: 2015

CCD photometry observation of a newly discovered, high amplitude Delta Scuti star GSC 1566-2802, with a visible filter, is presented. The observations were carried out at Alborz Observatory located in Mahdasht, Karaj, Iran. The main goal of this project was to update our knowledge of the periodic variations of the target star. This paper covers three analyses, first calculating a new ephemeris and plotting a new light curve based on 19 times of maxima; then a Fourier analysis of the observed data points which results in determining probable oscillation modes, as well as computing its physical parameters which guide us to its harmonics and pulsation modes. © 2014 Elsevier B.V. All rights reserved. Source


Hasanzadeh A.,International Occultation Timing Association Middle East Section IOTA ME | Hasanzadeh A.,University of Tehran | Farsian F.,International Occultation Timing Association Middle East Section IOTA ME | Nemati M.,International Occultation Timing Association Middle East Section IOTA ME
New Astronomy | Year: 2015

A photometric CCD study of EQ Tauris was carried out in the R, V and B bands. These new data were analyzed by using the PHOEBE and Binary Marker 3 programs, which yielded the geometrical system parameters and mass and radius of both stars. We find these to confirm the results of Pribulla and Vanko (2002). Using these new data together with data from the literature, the orbital period variations were studied by using the Kalimeris method. We find the same timescale of variability of the orbital period as Pribulla and Vanko (2002), namely about 49 years. © 2014 Elsevier B.V. All rights reserved. Source


Ostadnezhad S.,International Occultation Timing Association Middle East Section IOTA ME | Ostadnezhad S.,Shiraz University | Delband M.,International Occultation Timing Association Middle East Section IOTA ME | Delband M.,Shiraz University | And 2 more authors.
New Astronomy | Year: 2014

New observations of the eclipsing binary system V1191 Cyg were carried out by using CCD in BVR filters and new times of light minimum and new ephemeris were obtained. For the first time, the O-C curve of this binary was analyzed by using the Kalimeris method and the orbital period and its rate of change were calculated as functions of time. The BVR light curves were analyzed using both the Binary Maker 3.0 and PHOEBE 0.31a programs to determine some geometrical and physical parameters. By analyzing O-C diagram, the period variation was calculated to be dP/dt=3.13×10-6dyr-1 and the rate of mass transfer was Ṁc=5.23×10 -7M⊙yr-1. © 2014 Elsevier B.V. All rights reserved. Source

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