[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/y-centauri-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki24\/y-centauri-wikipedia\/","headline":"Y Centauri – Wikipedia","name":"Y Centauri – Wikipedia","description":"before-content-x4 From Wikipedia, the free encyclopedia after-content-x4 Variable star in the constellation Centaurus Y Centauri or Y Cen (HD 127233,","datePublished":"2020-05-27","dateModified":"2020-05-27","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\/y-centauri-wikipedia\/","about":["Wiki"],"wordCount":3670,"articleBody":"     (adsbygoogle = window.adsbygoogle || []).push({});before-content-x4From Wikipedia, the free encyclopedia       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Variable star in the constellation CentaurusY Centauri or Y Cen (HD 127233, HIP 70969) is a semiregular variable star in the constellation of Centaurus.       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4The variability in the star was discovered by Williamina Fleming in 1895 and published in the Third Catalogue of Variable Stars.  The photographic magnitude range was given as 7.7 – 8.8, but the variability was described as “somewhat doubtful”.[8] It was later given the designation HV 52 in the Harvard Catalogue of Variable Stars.[9]  The General Catalogue of Variable Stars lists it as a semiregular variable star with a period of 180 days and a visual magnitude range of 8.0 – 9.1.[3]  A study of Hipparcos satellite photometry found a small amplitude range of 0.2 magnitudes at a visual magnitude of 8.53.[10]The distance of the star is poorly known.  The revised Hipparcos annual parallax of 3.50 mas gives a distance of 900 light years.[2]  A study taking into account the variability of the star found a parallax of 5.57 mas, corresponding to a distance of 585 light years.[11]  Both estimates have a margin of error over 20%.  The Gaia Data Release 2 parallax lies between these two values and appears more accurate with a margin of error around 5%, but with a large value for astrometric noise.[6]Gaia EDR3 does not list a parallax for this star.[12]Y Centauri is an asymptotic giant branch[13] star 330 times as luminous as the sun.  Its spectral type varies between M4 and M7 as it pulsates.[3]The star has been observed to produce 22\u00a0GHz water maser emission,[14] although later searches did not find any maser emission.[13]       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4References[edit]^ “ASAS All Star Catalogue”. The All Sky Automated Survey. Retrieved 8 December 2021.^ a b c 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.^ a b c d e Samus, N. N.; Durlevich, O. V.;  et\u00a0al. (2009). “VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)”. VizieR On-line Data Catalog: B\/GCVS. Originally Published in: 2009yCat….102025S. 1: 02025. Bibcode:2009yCat….102025S.^ a b Ducati, J. R. (2002). “VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson’s 11-color system”. CDS\/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237….0D.^ Gontcharov, G. A. (2006). “Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system”. Astronomy Letters. 32 (11): 759\u2013771. arXiv:1606.08053. Bibcode:2006AstL…32..759G. doi:10.1134\/S1063773706110065. S2CID\u00a0119231169.^ a b c d e f g Brown, A. G. A.;  et\u00a0al. (Gaia collaboration) (August 2018). “Gaia Data Release 2: Summary of the contents and survey properties”. Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A…616A…1G. doi:10.1051\/0004-6361\/201833051. Gaia DR2 record for this source at VizieR.^ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). “Fundamental parameters and infrared excesses of Tycho-Gaia stars”. Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093\/mnras\/stx1433. S2CID\u00a073594365.^ Chandler, S. C. (1896). “Third catalogue of variable stars”. Astronomical Journal. 16: 145. Bibcode:1896AJ…..16..145C. doi:10.1086\/102484.^ Pickering, Edward Charles (1905). “Second supplement to Catalogue of Variable Stars”. Annals of Harvard College Observatory. 53: 143\u2013153. Bibcode:1905AnHar..53..143P.^ Koen, Chris; Eyer, Laurent (2002). “New periodic variables from the Hipparcos epoch photometry”. Monthly Notices of the Royal Astronomical Society. 331 (1): 45\u201359. arXiv:astro-ph\/0112194. Bibcode:2002MNRAS.331…45K. doi:10.1046\/j.1365-8711.2002.05150.x. S2CID\u00a010505995.^ Pourbaix, D.; Platais, I.; Detournay, S.; Jorissen, A.; Knapp, G.; Makarov, V. V. (2003). “How many Hipparcos Variability-Induced Movers are genuine binaries?”. Astronomy and Astrophysics. 399 (3): 1167\u20131176. arXiv:astro-ph\/0212201. Bibcode:2003A&A…399.1167P. doi:10.1051\/0004-6361:20021843. S2CID\u00a017844733.^ Brown, A. G. A.;  et\u00a0al. (Gaia collaboration) (2021). “Gaia Early Data Release 3: Summary of the contents and survey properties”. Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A…649A…1G. doi:10.1051\/0004-6361\/202039657. S2CID\u00a0227254300. (Erratum:\u00a0doi:10.1051\/0004-6361\/202039657e).  Gaia EDR3 record for this source at VizieR.^ a b Yoon, Dong-Hwan; Cho, Se-Hyung; Kim, Jaeheon; Yun, Young joo; Park, Yong-Sun (2014). “SiO and H2O Maser Survey toward Post-asymptotic Giant Branch and Asymptotic Giant Branch Stars”. The Astrophysical Journal Supplement. 211 (1): 15. Bibcode:2014ApJS..211…15Y. doi:10.1088\/0067-0049\/211\/1\/15. S2CID\u00a073561291.^ Lewis, B. M. (October 1997). “A renewed search for water maser emission from Mira Variables”. The Astrophysical Journal. 114: 1602\u20131606. arXiv:astro-ph\/9706207. Bibcode:1997AJ….114.1602L. doi:10.1086\/118591. S2CID\u00a0119386147.       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