The First Light Curve Solution of GW Leo and Refined Ephemeris of Two Contact Binary Systems
| Autor: | M. Hedayatjoo, Y. Dashti, A. Gardi, A. Halavati, F. Mohammadizadeh, E. Lashgari, Atila Poro, Fatemeh Davoudi, K. GholizadehSoghar |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Astronomy Reports. 65:543-551 |
| ISSN: | 1562-6881 1063-7729 |
| Popis: | We performed the first light curve analysis of GW Leo and a new ephemeris is obtained for QT Boo. The light curve investigation also yields that the system GW Leo is a contact W UMa eclipsing binary with a photometric mass ratio of q = 0.44 ± 0.03, a fillout factor of f = 59.6%, and an inclination of 50.77° ± 0.09°. Due to the O’Connell effect which is known as asymmetries in the light curves’ maxima, a cold spot is employed along with the solution. The photometric and physical parameters of GW Leo were determined (e.g., Mh = 1.373 ± 0.024, Mc = 0.604 ± 0.027, Rh = 1.261 ± 0.041, Rc = 0.909 ± 0.039, and a( $${{R}_{ \odot }}$$ ) = 2.553 ± 0.004). According to the light curve solution results, we suggest that GW Leo is an A-type W UMa binary system. We also calculate the distance of GW Leo from the distance modulus formula as 483.5 ± 41 pc, which is in a good agreement to the quantity measured by the Gaia EDR3 using the binary systems' parallax. Moreover, the positions of their components on the H–R diagram are represented. |
| Databáze: | OpenAIRE |
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