Английская Википедия:Beta Comae Berenices

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Файл:Beta Comae Berenices.jpg
β Comae Berenices in optical light

Beta Comae Berenices (β Comae Berenices, β Com) is a main sequence dwarf star in the northern constellation of Coma Berenices. It is located at a distance of about Шаблон:Convert from Earth. The Greek letter beta (β) usually indicates that the star has the second highest visual magnitude in the constellation. However, with an apparent visual magnitude of 4.3,[1] this star is actually slightly brighter than α Comae Berenices. It can be seen with the naked eye, but may be too dim to be viewed from a built-up urban area.

The star is similar to the Sun, being only slightly larger and brighter in absolute magnitude. It has a stellar classification of G0 V,[2] compared to G2 V for the Sun. The effective temperature of the outer envelope is 5,936 K,[3] giving it a yellow hue of a G-type star.[4] In terms of age it is younger than the Sun, being about 3 billion years old.[5]

Observations of short term variations in the chromatic activity suggest that the star undergoes differential rotation,[6] with a rotation period of about 11–13 days.[7] Its surface has a measured activity cycle of 16.6 years, compared to 11 years on the Sun. It may also have a secondary activity cycle of 9.6 years.[8] At one time it was thought that this star might have a spectroscopic companion. However, this was ruled out by means of more accurate radial velocity measurements. No planets have yet been detected around it, and there is no evidence of a dusty disk.

The habitable zone for this star, defined as the locations where liquid water could be present on an Earth-like planet, is 0.918–1.96 AU, where 1 AU is the average distance from the Earth to the Sun.[9]

See also

References

Шаблон:Reflist

External links

Шаблон:Stars of Coma Berenices

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  1. ↑ Ошибка цитирования Неверный тег <ref>; для сносок clpl4_99 не указан текст
  2. ↑ Ошибка цитирования Неверный тег <ref>; для сносок aj121_4_2148 не указан текст
  3. ↑ Ошибка цитирования Неверный тег <ref>; для сносок apj746_1_101 не указан текст
  4. ↑ Ошибка цитирования Неверный тег <ref>; для сносок csiro не указан текст
  5. ↑ Ошибка цитирования Неверный тег <ref>; для сносок apj687 не указан текст
  6. ↑ Ошибка цитирования Неверный тег <ref>; для сносок apjp2l_393_2_L63 не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок apj475_303 не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок apj438_1_269 не указан текст
  9. ↑ Ошибка цитирования Неверный тег <ref>; для сносок aaa555_A104 не указан текст
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