Английская Википедия: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.[1] During the primary eclipse, the brightness of the system drops to magnitude 11.03, then to 10.97 during the secondary minimum.[1] The secondary eclipse is total.[2] Based on parallax measurements, it is located at a distance of approximately 730 light years from the Sun.[3]

The star HV 6189 was identified as a short-period variable by H. Shapley and E. M. Hughes in 1940,[4] then was more closely studied by Soviet astronomer V. P. Tsesevich in 1954.[5] It was determined to be a W UMa-type variable and was noted for being located in the region of the Pleiades open cluster.[6] An analysis of data from Tsesevich and subsequent observations by B. S. Whitney in 1972 suggested that the period is variable. His observations from Konkoly Observatory showed a period of Шаблон:Cvt.[7] W. R. Benbow and R. L. Mutel built a light curve of the eclipsing variable in 1995 that displayed evidence of an active region on the stellar surface.[8] Orbital period changes continued to be observed, and in 2002 T. Pribulla and M. Vanko 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.[9]

This is a shallow contact binary system,[2] belonging to sub-type A of the W Ursae Majoris class.[1] It has an orbital period of Шаблон:Convert[5] 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.[2] 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.[10]

References

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Further reading

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Шаблон:Taurus (constellation)

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  1. ↑ 1,0 1,1 1,2 Ошибка цитирования Неверный тег <ref>; для сносок Samus_et_al_2017 не указан текст
  2. ↑ 2,0 2,1 2,2 Ошибка цитирования Неверный тег <ref>; для сносок Li_et_al_2014 не указан текст
  3. ↑ Ошибка цитирования Неверный тег <ref>; для сносок GaiaEDR3 не указан текст
  4. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Shapley_Hughes_1940 не указан текст
  5. ↑ 5,0 5,1 Ошибка цитирования Неверный тег <ref>; для сносок Rucinski_et_al_2001 не указан текст
  6. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Artiukhina1961 не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Whitney1972 не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Benbow_Mutel_1995 не указан текст
  9. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Pribulla_Vanko_2002 не указан текст
  10. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Yuan_Qian_2007 не указан текст
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