Английская Википедия:BH Virginis

Материал из Онлайн справочника
Перейти к навигацииПерейти к поиску

Шаблон:Short description Шаблон:Starbox begin Шаблон:Starbox image Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox orbit Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end

BH Virginis is a binary star system in the equatorial constellation of Virgo. With a typical apparent visual magnitude of 9.6,[1] it is too faint to be visible to the naked eye. Based on parallax measurements, it is located at a distance of approximately 488 light years from the Sun.[2] The system is drifting closer with a net radial velocity of −23 km/s.[3]

This system was determined to be a short period variable star by C. Hoffmeister in 1935.[4] W. Zessewitsch found a period of Шаблон:Convert for the system in 1944. In 1957, M. Kitamura and associates refined the light curve of this Algol-type eclipsing variable and discovered some irregular fluctuations not explained by the eclipse cycle.[5] R. H. Koch in 1967 reported observing a change in the depth of the primary eclipse.[6] In 1982, M. Hoffmann concluded that both stars are intrinsically variable, indicating this is an RS Canum Venaticorum variable system.[7]

This is a near-contact[8] binary system with a circular orbit having a period of Шаблон:Convert.[9] The orbital plane is inclined at an angle of 88° to the line of sight from the Earth,[10] allowing both components to eclipse each other once per orbit. During the deep[9] primary eclipse the system decreases in brightness by 0.96 magnitude, while the shallower secondary eclipse decreases the system by 0.64 magnitude.[8] Cyclical oscillations in the orbital period have been observed with two short-term periods of 9.2 and 11.8 years, and a longer-term oscillation of 51.7 years. The short term oscillations may be due to magnetic activity on the stars, while the longer period could be caused by an unseen third body.[11]

Both components of this system are G-type main-sequence stars, with stellar classifications of G0V and G2V, respectively.[9] Evidence of star spots have been found on both stars, but appear to be predominantly on the secondary component.[12] The two stars are somewhat larger and more massive than the Sun.[10]

References

Шаблон:Reflist

Further reading

Шаблон:Div col

Шаблон:Div col end

Шаблон:Virgo

  1. Ошибка цитирования Неверный тег <ref>; для сносок Samus_et_al_2017 не указан текст
  2. Ошибка цитирования Неверный тег <ref>; для сносок GaiaEDR3 не указан текст
  3. Ошибка цитирования Неверный тег <ref>; для сносок Karataș_et_al_2004 не указан текст
  4. Ошибка цитирования Неверный тег <ref>; для сносок Hoffmeister1935 не указан текст
  5. Ошибка цитирования Неверный тег <ref>; для сносок Kitamura_et_al_1957 не указан текст
  6. Ошибка цитирования Неверный тег <ref>; для сносок Koch1967 не указан текст
  7. Ошибка цитирования Неверный тег <ref>; для сносок Hoffmann1982 не указан текст
  8. 8,0 8,1 Ошибка цитирования Неверный тег <ref>; для сносок Avvakumova_et_al_2013 не указан текст
  9. 9,0 9,1 9,2 Ошибка цитирования Неверный тег <ref>; для сносок Abt1965 не указан текст
  10. 10,0 10,1 Ошибка цитирования Неверный тег <ref>; для сносок Kjurkchieva_et_al_2004 не указан текст
  11. Ошибка цитирования Неверный тег <ref>; для сносок Tian_et_al_2008 не указан текст
  12. Ошибка цитирования Неверный тег <ref>; для сносок Xiang_et_al_2007 не указан текст