Photometric observations of the W UMa stars CSS J113505.5+332031, ASAS J142124+1813.1 and HR Boo |
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| Institution: | 1. Observatorio Astronómico Nacional, Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 877, Ensenada, BC 22830, México;2. Department of Physics and Astronomy, Shumen University, Shumen 9700, Bulgaria;1. Department of Physics, Hamedan Branch, Islamic Azad University, Hamedan, Iran;2. Department of Science, Hamedan University of Technology, Hamedan 65155, Iran;3. Department of Mathematics, Hamedan Branch, Islamic Azad University, Hamedan, Iran;1. Astronomy and Astrophysics Research Division Entoto Observatory and Research Center (EORC), Ethiopian Space Science and Technology Institute (ESSTI), Addis Ababa, 33679, Ethiopia;2. Mekelle University, College of Natural and Computational Sciences, Department of Physics, Mekelle, Ethiopia;3. Institute of Astronomy, Russian Acad. Sci., 48 Pyatnitskaya St., Moscow 119017, Russia;1. Department of Physics, Mbarara University of Science and Technology, P. O Box 1410, Mbarara, Uganda;2. Department of Physics, North-West University, Private Bag X2046, Mmabatho, 2735, South Africa;3. Centre for Space Research, North-West University, South Africa;4. Department of Physics, Muni University, P.O. Box 725, Arua-Uganda;1. Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlářská 2, Brno 611 37, Czechia;2. Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne e.V. (BAV), Berlin, Germany;3. American Association of Variable Star Observers (AAVSO), Cambridge, USA;4. Institute for Astrophysics, University of Vienna, Türkenschanzstrasse 17, Vienna 1180, Austria;5. Astronomical Institute, Slovak Academy of Sciences, Tatranská Lomnica 059 60, Slovakia;6. Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhnii Arkhyz 369167, Russia |
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| Abstract: | Multicolor photometric observations of the W UMa binaries CSS J113505.5+332031, ASAS J142124+1813.1 and HR Boo are presented. They led to improvement of the orbital periods of CSS J113505.5+332031 and HR Boo. The light curve solutions revealed that all the targets are overcontact binaries with moderate fill-out factors whose components are of G and K spectral types. ASAS J142124+1813.1 and HR Boo undergo total eclipses and their mass ratios are well-determined. The small mass ratio of ASAS J142124+1813.1 puts this target in the list of W UMa binaries with extreme low mass ratios. The possible solutions for the partially-eclipsed binary CSS J113505.5+332031 and their precision are discussed in detail. Masses, radii and luminosities of the target components were estimated by our light curve solutions and GAIA distances. |
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