[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/2016\/09\/21\/hd-165634-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki24\/2016\/09\/21\/hd-165634-wikipedia\/","headline":"HD 165634 – Wikipedia","name":"HD 165634 – Wikipedia","description":"From Wikipedia, the free encyclopedia Star in the constellation Sagittarius HD 165634 is a star in the southern constellation of","datePublished":"2016-09-21","dateModified":"2016-09-21","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki24\/author\/lordneo\/","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","url":"https:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","height":"1","width":"1"},"url":"https:\/\/wiki.edu.vn\/en\/wiki24\/2016\/09\/21\/hd-165634-wikipedia\/","wordCount":3016,"articleBody":"From Wikipedia, the free encyclopediaStar in the constellation SagittariusHD 165634 is a star in the southern constellation of Sagittarius. It has a yellow hue and is faintly visible to the naked eye with apparent visual magnitude of 4.56.[2] The star is located at a distance of approximately 339\u00a0light years from the Sun based on parallax,[1] but is drifting closer with a radial velocity of \u22125\u00a0km\/s.[4] It has an absolute magnitude of \u22120.53.[5]This is a CH-peculiar[9]giant star with a stellar classification of G7:IIIbCN-1CH-3.5HK+1, and has been designated as a standard example of this spectral type.[3] This notation indicates a G-type giant (G7:IIIb) with underabundances of CN and CH molecules. It is a rare “weak G\u2013band star”, showing an abnormally weak G band of the molecule CN. This indicates an underabundance of carbon in the stellar atmosphere; the abundances of most other elements are otherwise normal for a star at its evolutionary stage.[10] The depletion of carbon is a reflection of internal processes while the star is on the red giant branch, accompanied by deep mixing.[11]In 2000, B\u00f6hm-Vitense and collaborators suggested that the star has an evolved white dwarf companion. This object can explain an excess flux of ultraviolet radiation, and a mass-transfer could be the source for a mild nitrogen excess on the visible component. The progenitor star was not very evolved because there is no excess of s-process elements such as barium. It may even have been a low-mass star that lost its envelope.[9]References[edit]^ a b c d e f Van Leeuwen, F. (2007). “Validation of the new Hipparcos reduction”. Astronomy and Astrophysics. 474 (2): 653\u2013664. arXiv:0708.1752. Bibcode:2007A&A…474..653V. doi:10.1051\/0004-6361:20078357. S2CID\u00a018759600. Vizier catalog entry^ a b c d Ducati, J. R. (2002). “Catalogue of Stellar Photometry in Johnson’s 11-color system”. CDS\/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237….0D.^ a b Keenan, Philip C.; McNeil, Raymond C. (1989). “The Perkins catalog of revised MK types for the cooler stars”. The Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS…71..245K. doi:10.1086\/191373.^ a b Nidever, David L.;  et\u00a0al. (2002). “Radial Velocities for 889 Late-Type Stars”. The Astrophysical Journal Supplement Series. 141 (2): 503\u2013522. arXiv:astro-ph\/0112477. Bibcode:2002ApJS..141..503N. doi:10.1086\/340570. S2CID\u00a051814894.^ a b Anderson, E.; Francis, Ch. (2012). “XHIP: An extended hipparcos compilation”. Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL…38..331A. doi:10.1134\/S1063773712050015. S2CID\u00a0119257644. Vizier catalog entry^ Reffert, Sabine;  et\u00a0al. (2015). “Precise radial velocities of giant stars”. Astronomy & Astrophysics. 574: A116. arXiv:1412.4634. Bibcode:2015A&A…574A.116R. doi:10.1051\/0004-6361\/201322360. hdl:10722\/215277. S2CID\u00a059334290. Vizier catalog entry^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordstr\u00f6m, B.; Mayor, M. (2014). “A catalog of rotational and radial velocities for evolved stars”. Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A…561A.126D. doi:10.1051\/0004-6361\/201220762. S2CID\u00a054046583. Vizier catalog entry^ “HD 165634”. SIMBAD. Centre de donn\u00e9es astronomiques de Strasbourg. Retrieved 2020-11-29.^ a b B\u00f6hm-Vitense, Erika;  et\u00a0al. (April 2000). “Do All BA II Stars Have White Dwarf Companions?”. The Astrophysical Journal. 533 (2): 969\u2013983. Bibcode:2000ApJ…533..969B. doi:10.1086\/308678.^ Sneden, C.;  et\u00a0al. (June 1978). “Light-element abundances in the weak G-band star HR 6766”. Astrophysical Journal. 222: 585\u2013594. Bibcode:1978ApJ…222..585S. doi:10.1086\/156173.^ Palacios, A.;  et\u00a0al. (February 2012). “Weak G-band stars on the H-R diagram: clues to the origin of the Li anomaly”. Astronomy & Astrophysics. 538: 11. arXiv:1112.2973. Bibcode:2012A&A…538A..68P. doi:10.1051\/0004-6361\/201117988. S2CID\u00a0119186052. A68.  "},{"@context":"http:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/#breadcrumbitem","name":"Enzyklop\u00e4die"}},{"@type":"ListItem","position":2,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/2016\/09\/21\/hd-165634-wikipedia\/#breadcrumbitem","name":"HD 165634 – Wikipedia"}}]}]