Английская Википедия:HR 273

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

HR 273 is a chemically peculiar spectroscopic binary system in the northern circumpolar constellation of Cassiopeia. It has an apparent visual magnitude of 5.9 making it faintly visible to the naked eye from dark suburban skies. Parallax measurements with the Hipparcos spacecraft put this system at a distance of roughly 350 light years.[1]

The primary, HR 273 A, is an Ap star[2] and the secondary is an Am star, making this a very unusual binary system. The primary has a magnetic field of 65 gauss, amongst the weakest seen in any Ap star. The magnetic field in the secondary is too weak to detect.[3]

Component A has a spectral type of A0 III, and has unusually strong lines of strontium, chromium, and europium so it is known as a SrCrEu star.[4] Although some spectral lines of the secondary star can be clearly distinguished, its spectral type cannot be clearly assigned. It is thought to be a late class A star, cooler than the primary. The primary star has been rotationally braked so that its rotational period closely matches its orbital period.[3]

References

Шаблон:Reflist

Шаблон:Stars of Cassiopeia Шаблон:Sky

  1. Ошибка цитирования Неверный тег <ref>; для сносок hipparcos не указан текст
  2. Ошибка цитирования Неверный тег <ref>; для сносок renson не указан текст
  3. 3,0 3,1 Ошибка цитирования Неверный тег <ref>; для сносок alecian не указан текст
  4. Ошибка цитирования Неверный тег <ref>; для сносок carrier не указан текст