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Jafarzadeh S.J.,The International Occultation Timing Association Middle East Section IOTA ME | Jafarzadeh S.J.,Shahid Beheshti University | Poro A.,The International Occultation Timing Association Middle East Section IOTA ME
New Astronomy | Year: 2017

We carried out observation of the HADS (High-Amplitude Delta Scuti) variable GSC 4552–1498 through three filters. Our goal was to consider its periodic behavior using our photometry data in addition to previous observations. A new ephemeris and determination of oscillation modes of the star based on Fourier analysis are presented. The Two color diagram of the star as a function of its phase is shown. Finally, some of the star's physical parameters including mass, radius and luminosity are calculated. © 2017 Elsevier B.V.


Tavakkoli F.,The International Occultation Timing Association Middle East Section IOTA ME | Tavakkoli F.,University of Kashan | Hasanzadeh A.,The 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

New observations of the eclipsing binary system NR Cam were carried out using a CCD in B, V, and R filters and new times of light minimum and new ephemeris were obtained. The B, V, and R light curves were analyzed using both the Binary Maker 3.0 and PHOEBE 0.31 programs to determine some geometrical and physical parameters of the system. These results show that NR Cam is an overcontact binary and that both components are Main Sequence stars. The O'Connell effect on NR Cam was studied and some variations in spot parameters were obtained over the different years. ©2014 Elsevier B.V. All rights reserved.

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