Search for variables in six Galactic open clusters |
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| Institution: | 1. Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlá?ská 2, 611 37 Brno, Czechia;2. Nicolaus Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland;3. Austrian Academy of Sciences Space Research Institute, Schmiedlstraße 6, A-8042 Graz, Austria;4. Institut für Astrophysik, Universität Wien, Türkenschanzstraße 17, A-1180 Wien, Austria;5. Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University Ny Munkegade 120, DK-8000 Aarhus C, Denmark;6. Yunnan Astronomical Observatory, Chinese Academy of Sciences, P. O. Box 110, 650011 Kunming, China;7. Hvar Observatory, Faculty of Geodesy, University of Zagreb, Ka?i?eva 26, HR-10000 Zagreb, Croatia;1. Astronomy Department, National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Cairo, Egypt;2. Department of Astronomy and Meteorology, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt;3. Kottamia Center of Scientific Excellency of Astronomy and Space Sciences, (KCScE), Egypt\n |
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| Abstract: | Variables in open cluster (known distance, age, and metallicity) fields play an important role in stellar astrophysics because they allow to investigate the interior of stars. Therefore, six Galactic open clusters were selected to search for new variables and to complement data for already known variables. As five of these clusters are younger than 40 Myr, we aim at finding variable high-mass stars such as β Cephei and Slowly Pulsating B-type stars as well as classical pulsating stars within the instability strip. About 26 000 images (312 h) photometric images were taken at the 0.8 m (Vienna, Austria) and 1.0 m (Hvar, Croatia) telescope using V and I filters. The differential light curves were analyzed with standard time series analysis methods. In total, 11 variables were found in all investigated clusters. For nine of them, we were able to determine their nature and period. In addition, the membership probabilities from the literature were analyzed. |
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