A search for variable stars in the open clusters NGC7209, NGC1582 and Dolidze 18 |
| |
| Institution: | 1. Instituto de Física da Universidade de São Paulo, Rua do Matão, Travessa R 187, Cidade Universitária, São Paulo, SP, 05314-970, Brazil;2. Departamento de Física, UNESP - Univ Estadual Paulista, Av. 24A, 1515, Bela Vista, Rio Claro, SP, 13506-900, Brazil;1. Astronomy Dept., National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Cairo, Egypt;2. Kottamia Center of Scientific Excellence for Astronomy and Space Sciences (KCScE), STDF No. 5217;3. Astronomy Dept. and Meteorology, Faculty of Science, Al-Azhar University, Cairo, Egypt |
| |
| Abstract: | CCD time-series photometric observations are presented for the stars in the fields of the open clusters NGC7209, NGC1582 and Dolidze 18 in Johnson V, together with some photometric observations in R, and B. The results reveal 14 variable stars in the three clusters in total, among which 13 are newly-discovered variables. With color–magnitude diagrams and color–color diagram, memberships of the variable stars are estimated. With the derived light curves, scales of time and amplitude of variability of these variable stars are obtained. Together with the spectral types due to the estimation of color temperatures, possible types of the variable stars are preliminarily discussed. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
