About: EQ Tauri

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EQ Tauri is a triple star system in the equatorial constellation of Taurus that includes a contact eclipsing binary. The system is too faint to be viewed with the naked eye, having a baseline apparent visual magnitude of 10.5. During the primary eclipse, the brightness of the system drops to magnitude 11.03, then to 10.97 during the secondary minimum. The secondary eclipse is total. Based on parallax measurements, it is located at a distance of approximately 730 light years from the Sun.

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  • EQ Tauri is a triple star system in the equatorial constellation of Taurus that includes a contact eclipsing binary. The system is too faint to be viewed with the naked eye, having a baseline apparent visual magnitude of 10.5. During the primary eclipse, the brightness of the system drops to magnitude 11.03, then to 10.97 during the secondary minimum. The secondary eclipse is total. Based on parallax measurements, it is located at a distance of approximately 730 light years from the Sun. The star HV 6189 was identified as a short-period variable by H. Shapley and in 1940, then was more closely studied by Soviet astronomer in 1954. It was determined to be a W UMa-type variable and was noted for being located in the region of the Pleiades open cluster. An analysis of data from Tsesevich and subsequent observations by in 1972 suggested that the period is variable. His observations from Konkoly Observatory showed a period of 8.19 h. and built a light curve of the eclipsing variable in 1995 that displayed evidence of an active region on the stellar surface. Orbital period changes continued to be observed, and in 2002 and suggested it is caused by a third body in the system. They modeled it as a low mass red dwarf with an orbital period of 50.2 years. This is a shallow contact binary system, belonging to sub-type A of the W Ursae Majoris class. It has an orbital period of 8.1924 hours and a semimajor axis of 2.48 times the radius of the Sun. The orbit shows a cyclical change with a period of 22.7 years and an amplitude of 0.0058 days. A transit-like event was observed in 2010. The more massive component is a solar-type star with a deep convection zone that appears magnetically active with a significant coverage of star spots. (en)
  • EQ Tauri (EQ Tau / TYC 1260-909-1)​ es una estrella variable encuadrada en la constelación de Tauro.De magnitud aparente máxima +11,12, está aproximadamente a 468 años luz del Sistema Solar. EQ Tauri constituye una binaria de contacto en donde las dos componentes comparten su capa exterior de gas,​ siendo el tipo espectral conjunto G1.​La componente primaria es una estrella de tipo solar con una envoltura convectiva muy profunda.Con una temperatura efectiva de 5800 K, tiene una masa de 1,23 masas solares.Su luminosidad es un 33% mayor que la del Sol.Su radio es un 14% más grande que el radio solar y gira sobre sí misma a gran velocidad, concretamente 80 veces más deprisa que el Sol.Presenta manchas estelares, las cuales, dependiendo del momento de observación, cubren entre el 3 y el 20% de la fotosfera de la estrella.​ La componente secundaria tiene una masa igual al 54% de la masa solar, lo que implica que la relación entre las masas de las dos estrellas del sistema q es igual a 0,442.Tiene una temperatura de 5754 K y una luminosidad igual al 62% de la luminosidad solar.Su masa es de 0,54 masas solares y su radio equivale a 4/5 partes del radio solar.En esta componente se ha detectado un período de actividad magnética de 23 años de duración.​ Como la práctica totalidad de binarias de contacto, EQ Tauri es también una binaria eclipsante —del tipo W Ursae Majoris—, cuyo brillo decae 0,53 magnitudes en el eclipse principal y 0,47 magnitudes en el secundario.​Ambas estrellas están separadas entre sí por solo 2,48 radios solares o 0,012 UA.El período orbital del sistema es de 0,3413 días y se ha observado en él una variación cíclica de 48,5 años.Dicha variación puede estar originada por la presencia de un tercer cuerpo —cuya masa sería de 0,27 masas solares— o por variaciones magnéticas periódicas en la componente primaria.​ (es)
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  • medic (en)
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  • G2 (en)
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  • Primary (en)
  • Secondary (en)
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  • July 2022 (en)
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  • 0 (xsd:integer)
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  • J2000.0 (en)
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  • −30.628 (en)
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  • +69.758 (en)
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  • EQ Tauri (EQ Tau / TYC 1260-909-1)​ es una estrella variable encuadrada en la constelación de Tauro.De magnitud aparente máxima +11,12, está aproximadamente a 468 años luz del Sistema Solar. EQ Tauri constituye una binaria de contacto en donde las dos componentes comparten su capa exterior de gas,​ siendo el tipo espectral conjunto G1.​La componente primaria es una estrella de tipo solar con una envoltura convectiva muy profunda.Con una temperatura efectiva de 5800 K, tiene una masa de 1,23 masas solares.Su luminosidad es un 33% mayor que la del Sol.Su radio es un 14% más grande que el radio solar y gira sobre sí misma a gran velocidad, concretamente 80 veces más deprisa que el Sol.Presenta manchas estelares, las cuales, dependiendo del momento de observación, cubren entre el 3 y el 20% de (es)
  • EQ Tauri is a triple star system in the equatorial constellation of Taurus that includes a contact eclipsing binary. The system is too faint to be viewed with the naked eye, having a baseline apparent visual magnitude of 10.5. During the primary eclipse, the brightness of the system drops to magnitude 11.03, then to 10.97 during the secondary minimum. The secondary eclipse is total. Based on parallax measurements, it is located at a distance of approximately 730 light years from the Sun. (en)
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  • EQ Tauri (es)
  • EQ Tauri (en)
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