Английская Википедия:58 Leonis
Шаблон:Short description Шаблон:Starbox begin Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end
58 Leonis is a possible binary star[1] system in the southern part of the constellation of Leo, near the border with Sextans. It shines with an apparent magnitude of 4.85,[2] making it bright enough to be seen with the naked eye. An annual parallax shift of Шаблон:Val yields a distance estimate of 360 light years. It is moving further from the Sun with a heliocentric radial velocity of +6 km/s.[2]
This orange hued star is an evolved K-type giant with a stellar classification of Шаблон:Nowrap,[3] indicating a mild underabundance of iron in its spectrum. It was identified as a barium star by P. M. Williams (1971).[4] These are theorized to be stars that show an enrichment of s-process elements by mass transfer from a now-white dwarf companion when it passed through the asymptotic giant branch stage.[5] MacConnell et al. (1972) classified 58 Leonis as a marginal barium star.[6] De Castro et al. (2016) consider this to be only a probable barium star, because of the low degree of s-process enrichment, and they rejected it from their sample. Rather than having an evolved companion, it may instead have formed from a cloud that was mildly enriched with s-process elements.[6]
References
External links
- 58 Leonis in Hipparcos stars in Leo
- ↑ Ошибка цитирования Неверный тег
<ref>; для сносокEggleton2008не указан текст - ↑ 2,0 2,1 Ошибка цитирования Неверный тег
<ref>; для сносокLuck2015не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокperkins1989не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокWilliams1971не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокBergeat1997не указан текст - ↑ 6,0 6,1 Ошибка цитирования Неверный тег
<ref>; для сносокdeCastro2016не указан текст
- Английская Википедия
- K-type giants
- Barium stars
- Binary stars
- Leo (constellation)
- Bayer objects
- Durchmusterung objects
- Flamsteed objects
- Henry Draper Catalogue objects
- Hipparcos objects
- Bright Star Catalogue objects
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