Английская Википедия:FG Virginis

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

FG Virginis is a well-studied variable star in the equatorial constellation of Virgo. It is a dim star, near the lower limit of visibility to the naked eye, with an apparent visual magnitude that ranges from 6.53 down to 6.58.[1] The star is located at a distance of 273.5 light years from the Sun based on parallax measurements,[2] and is drifting further away with a radial velocity of +16 km/s.[3] Because of its position near the ecliptic, it is subject to lunar occultations.[4]

The variability of this star was first reported by O. J. Eggen in 1971, who classified it as an ultra-short period cepheid – a proposed category of pulsating stars in the instability strip.[5] It was subsequently grouped in the class of Delta Scuti variables, which show a pulsation period of less than a day.[6] Observations in 1984 by P. Lopez de Coca showed at least one pulsation period with a cycle of Шаблон:Convert.[7] L. Mantegazza and associates in 1994 were able to detect seven or more pulsation modes, with the previously detected dominant mode being a radial pulsation with a frequency of 12.72 cycles per day.[8]

The star became of interest to astroseismology study because of its relatively slow rotation rate and the numerous modes of pulsation. A multi-site campaign involving the Whole Earth Telescope network was conducted in 1993 to observe this star, which detected ten modes.[9] This was increased to 24 frequencies in 1998,[10] then 67 independent frequencies with 79 total by 2005. Evidence suggests there are many more such modes.[11]

This is an A-type main-sequence star with a stellar classification of A8/9V,[12] but is near the end of its main sequence lifetime.[13] It is classified as a Delta Scuti variable that varies in brightness with an amplitude of 0.040 in visual magnitude and a period of Шаблон:Convert.[14] Element abundances are similar to the Sun, although there is a slight overabundance of barium and underabundances of sulfur and carbon.[15] It has a projected rotational velocity of 21 km/s, but the actual rotational velocity is likely much higher at around 80 km/s.[13]

References

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Further reading

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Шаблон:Virgo

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  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 GaiaDR2 не указан текст
  4. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Eitter_Beavers_1979 не указан текст
  5. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Eggen1971 не указан текст
  6. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Baglin_et_al_1973 не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Lopex_de_Coca_et_al_1984 не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Mantegazza_et_al_1994 не указан текст
  9. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Breger_et_al_1995 не указан текст
  10. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Breger_et_al_1999 не указан текст
  11. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Breger_et_al_2005 не указан текст
  12. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Houk_Swift_1999 не указан текст
  13. ↑ 13,0 13,1 Ошибка цитирования Неверный тег <ref>; для сносок Breger_Lenz_2019 не указан текст
  14. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Rodríguez_et_al_2000 не указан текст
  15. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Mittermayer_Weiss_2003 не указан текст
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