Английская Википедия:AB Pictoris
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
AB Pictoris (abbreviated AB Pic, also catalogued as HD 44627) is a K-type main-sequence star, located 163.5 light-years away in the southern constellation of Pictor.[1] It has been identified as a member of the young (30 million years old) Tucana–Horologium association.[2] The star has been classified as a BY Draconis variable,[3] indicating it has an active chromosphere. It is an X-ray source and displays emission lines in its spectrum.[4][5]
In 2005 it was announced that an astronomical object (AB Pictoris b, abbreviated AB Pic b) had been imaged in 2003 and 2004 close to and apparently in orbit around the star. Its mass suggests that it is at the borderline between being a brown dwarf or a planet.[6]
Шаблон:AnchorPossible planetary system
In 2003 and 2004, an object (now catalogued as AB Pictoris b) was observed close to the star by a team of astronomers at the European Southern Observatory. Since it had common proper motion with AB Pictoris, it was concluded that it was physically close to the star. Its spectral type was estimated as between L0V and L3V. Using evolutionary models, its mass was estimated as from 13 to 14 Jupiter masses.[6] However, because modelling such young objects is difficult, this estimate is very uncertain; some models give masses as low as 11 Jupiter masses or as high as 70 Jupiter masses. Temperature estimates range from 1600 K to 2400 K.[8] As it is not known if the mass of the object exceeds the deuterium burning limit of 13 Jupiter masses, it is not clear whether the object should be classified as an extrasolar planet or a brown dwarf.[6] The planetary orbit is significantly misaligned with its spin axis orientation (obliquity), possibly due to gravitational interactions with the additional inner planet.[9] Шаблон:OrbitboxPlanet begin Шаблон:OrbitboxPlanet Шаблон:OrbitboxPlanet hypothetical Шаблон:Orbitbox end
See also
References
External links
- Шаблон:Cite web
- Homogeneous comparison of directly detected planet candidates: GQ Lup, 2M1207, AB Pic, Ralph Neuhaeuser, ESO Workshop Proceedings on Multiple Stars, Шаблон:Bibcode, Шаблон:Arxiv.
- Шаблон:Cite web
- ↑ Ошибка цитирования Неверный тег
<ref>; для сносокGaiaDR3не указан текст - ↑ Шаблон:Cite journal.
- ↑ Ошибка цитирования Неверный тег
<ref>; для сносокSamus_et_al_2017не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокHaakonsen_Rutledge_2009не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокTorres2006не указан текст - ↑ 6,0 6,1 6,2 A companion to AB Pic at the planet/brown dwarf boundary, G. Chauvin, A.-M. Lagrange, B. Zuckerman, C. Dumas, D. Mouillet, I. Song, J.-L. Beuzit, P. Lowrance, and M. S. Bessell, Astronomy and Astrophysics 438, #3 (August 2005), pp. L29–L32, Шаблон:Bibcode, Шаблон:Doi, Шаблон:Arxiv.
- ↑ Ошибка цитирования Неверный тег
<ref>; для сносокKiragaне указан текст - ↑ Homogeneous comparison of directly detected planet candidates: GQ Lup, 2M1207, AB Pic, Ralph Neuhaeuser, ESO Workshop Proceedings on Multiple Stars, Шаблон:Bibcode, Шаблон:Arxiv.
- ↑ Шаблон:Citation
- Английская Википедия
- Страницы с неработающими файловыми ссылками
- K-type main-sequence stars
- BY Draconis variables
- Astronomical X-ray sources
- Planetary systems with one confirmed planet
- Pictor
- Durchmusterung objects
- Hipparcos objects
- Henry Draper Catalogue objects
- Objects with variable star designations
- Страницы, где используется шаблон "Навигационная таблица/Телепорт"
- Страницы с телепортом
- Википедия
- Статья из Википедии
- Статья из Английской Википедии
- Страницы с ошибками в примечаниях
