Absolute parameters of the W UMa binaries CSS J223614+311343, V523 Aur and V783 And |
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| Institution: | 1. Department of Physics and Astronomy, Shumen University, Shumen 9700, Bulgaria;2. Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, Mexico;3. Department of Astronomy, Beijing Normal University, Beijing 100875, China;1. The International Occultation Timing Association Middle East section, Iran;2. Adana Organised Industrial Zones Vocational School of Technical Science, University of Çukurova, 01410, Adana, Turkey;3. Space Science and Solar Energy Research and Application Center (UZAYMER), University of Çukurova, 01330, Adana, Turkey;1. Astronomy Dept., National Research Institute of Astronomy and Geophysics, Box: 138, 11421, Helwan, Cairo, Egypt;2. Kottamia Center of Scientific Excellence in Astronomy and Space Sciences (KCScE) STDF, ASRT, Cairo, Egypt;3. Physics Dept., College of Science, Northern Border University, 1320, Arar, Saudi Arabia;4. Astronomy Dept. and Meteorology, Faculty of Science, Al-Azhar University, Cairo, Egypt;1. The International Occultation Timing Association Middle East Section, Iran, info@iota‐me.com;2. The Seventh IOTA/ME Summer School of Astronomy, Astronomical Research Center, Qom, Iran;3. Astrophysics Research Centre and Observatory, Çanakkale Onsekiz Mart University, Terzio?lu Kampüsü, TR-17020, Çanakkale, Turkey;1. Department of Physics and Astronomy, Shumen University, Shumen 9700, Bulgaria;2. Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, Mexico;1. Astronomy Dept., National Research Institute of Astronomy and Geophysics, (NRIAG), Helwan, Cairo, Egypt;2. Astronomy Dept. and Meteorology, Faculty of Science, Al-Azhar University, Cairo, Egypt;3. Kottamia Center of Scientific Excellence in Astronomy and Space Sciences (KCScE), STDF 5217, Cairo, Egypt;1. Department of Physics and Astronomy, Shumen University, Shumen 9700, Bulgaria;2. Institute of Astronomy and NAO, Bulgarian Academy of Sciences, 72 Tsarigradsko Shose Blvd., Sofia 1784, Bulgaria |
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| Abstract: | Photometric BVRc observations of the stars CSS J223614+311343, V523 Aur and V783 And were carried out and their absolute parameters (masses, radii and luminosities) were determined based on light curve modeling and Gaia distances. The main results are: (i) The components of CSS J223614+311343 and V783 And are of K spectral type while those of V523 Aur are G stars; (ii) The three systems have middle fillout factors 0.20–0.29; (iii) CSS J223614+311343 and V783 And are of A-subtype while V523 Aur is of W-subtype; (iv) The common target masses are near the lower mass limit for the known W UMa binaries; (v) The smaller in size (and less massive) components of all targets locate above the MS band of the evolutional diagrams while the bigger components are within the MS band. The only exception is the bigger component of V523 Aur that is also above the MS band. This result was attributed to the W-subtype of the target. |
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