Английская Википедия:1 Aquarii
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1 Aquarii is a binary star[1] system in the zodiac constellation of Aquarius, about 257 light years away from the Sun.[2] 1 Aquarii is the Flamsteed designation. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.151,[3] located a degree north of the celestial equator.[1] The system is moving closer to the Earth with a heliocentric radial velocity of −41 km/s.[1]
Systematic observation for determining the orbit of this system began in 2002, some eighty years following the first radial velocity measurements. It is a single-lined spectroscopic binary with an orbital period of Шаблон:Convert and an eccentricity of 0.368.[1] The visible component is an aging giant star with a stellar classification of K1III.[4] At the age of 1.26[5] billion years old it is a red clump giant, which indicates it is on the horizontal branch and is generating energy through helium fusion at its core.[6] The star has 1.5[5] times the mass of the Sun and has expanded to 11[7] times the Sun's radius. It is radiating 53.7[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,715 K.[8]
The mass of the companion appears small, suggesting a red dwarf no higher than class M5.[1] In addition to the spectroscopic companion there are two faint optical companions that have no physical relation to 1 Aqr.[9]
Etymology
1 Aquarii was known to the ancients as al-sa'd al-malik, or "the lucky star of the king." Interpreting the unexpressed Arabic vowels, al-sa'd al-mulk, gives an alternate translation of "the lucky star of the kingdom." In English, the name is Sadalmelik (or Sadalmelek), although rarely used today.[10][11]
References
- ↑ 1,0 1,1 1,2 1,3 1,4 Ошибка цитирования Неверный тег
<ref>; для сносокGriffin2014не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокGaiaDR2не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокCousins1984не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокRoman1952не указан текст - ↑ 5,0 5,1 Ошибка цитирования Неверный тег
<ref>; для сносокFeuillet2016не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокAlves2000не указан текст - ↑ 7,0 7,1 Ошибка цитирования Неверный тег
<ref>; для сносокMassarotti2008не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокLuck2015не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокWDSC2014не указан текст - ↑ A Llnguist's Angle on the Star of Bethlehem — i.e. α Aquarii; Coates, Richard; Astronomy & Geophysics, Volume 49, Issue 5; (01 October 2008); Pp. 5.27–5.32; https://doi.org/10.1111/j.1468-4004.2008.49527.x
- ↑ Star Names; Arecibo Observatory website; mod.: Steve Gibson; accessed March 2019
- Английская Википедия
- K-type giants
- Horizontal-branch stars
- Spectroscopic binaries
- Triple stars
- Aquarius (constellation)
- Durchmusterung objects
- Flamsteed objects
- Henry Draper Catalogue objects
- Hipparcos objects
- Bright Star Catalogue objects
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- Википедия
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