Английская Википедия:HD 149404

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

HD 149404, also known as HR 6164 and V918 Scorpii, is a star about 4,300 light years from the Earth, in the constellation Scorpius.[1] It is a 5th magnitude star, so it will be faintly visible to the naked eye of an observer far from city lights.[1] It is a rotating ellipsoidal variable, a binary star for which the two stars' combined brightness varies slightly, from magnitude 5.42 to 5.50, during their 9.8 day orbital period.[2] It is one of the brightest members of the Ara OB1 association, which has the open cluster NGC 6193 at its center.[3]

The brightness variability of HD 149404 was marginally detected by the Argentinian astronomer Alenjandro Feinstein, during a photoelectric photometry study undertaken from 1963 through 1965.[4] It was given the variable star designation V918 Scorpii in 1980.[5] In 1977, Peter Conti et al. discovered that HD 149404 has double spectral lines, implying it is a spectroscopic binary.[6] Philip Massey and Peter Conti derived the first set of orbital elements for the binary system, in 1979.[7]

The secondary star in the HD 149404 system is believed to have originally been the more massive of the two, but it is now less massive than the primary due to mass transfer caused by Roche lobe overflow in the past.[8] The secondary may still be close to filling its Roche lobe.[9] It is a rare ON supergiant, a star with unusually strong absorption lines of nitrogen in its stellar spectrum.[10] Spectroscopic studies show that both stars have a stellar wind and a shock is formed where the two winds collide, which produces emission line features.[9]

References

Шаблон:Reflist

Шаблон:Stars of Scorpius

  1. 1,0 1,1 Ошибка цитирования Неверный тег <ref>; для сносок dr3 не указан текст
  2. Ошибка цитирования Неверный тег <ref>; для сносок GCVS не указан текст
  3. Ошибка цитирования Неверный тег <ref>; для сносок Thaller2001 не указан текст
  4. Ошибка цитирования Неверный тег <ref>; для сносок Feinstein1968 не указан текст
  5. Ошибка цитирования Неверный тег <ref>; для сносок Kholopov1981 не указан текст
  6. Ошибка цитирования Неверный тег <ref>; для сносок Conti1977 не указан текст
  7. Ошибка цитирования Неверный тег <ref>; для сносок Massey1979 не указан текст
  8. Ошибка цитирования Неверный тег <ref>; для сносок Raucq2016 не указан текст
  9. 9,0 9,1 Ошибка цитирования Неверный тег <ref>; для сносок Rauw2001 не указан текст
  10. Ошибка цитирования Неверный тег <ref>; для сносок walborn1985 не указан текст