りゅうこつ座AG星とは - わかりやすく解説 Weblio辞書

りゅうこつ座AG星

出典: フリー百科事典『ウィキペディア（Wikipedia）』 (2023/09/30 21:50 UTC 版)

りゅうこつ座AG星（りゅうこつざAGせい、AG Carinae 、AG Car）は、りゅうこつ座の恒星である。高光度青色変光星（LBV）に分類される変光星で、銀河系の中で最も光度の大きい恒星の1つとされる。太陽系からの距離はおよそ2万光年と遠く、通常は肉眼で観測することができない明るさである^[10]^[4]。見かけの等級は、6.0から8.1まで不規則に変化する^[1]。

脚注

注釈

^ 距離（光年）は、距離（パーセク）× 3.26で計算。有効数字1桁。

出典

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^ Samus, N. N.; et al. (2009-01), “General Catalogue of Variable Stars”, VizieR On-line Data Catalog: B/gcvs, Bibcode: 2009yCat....102025S
^ ^a ^b ^c ^d ^e ^f “AG Car -- Wolf-Rayet Star”. SIMBAD. CDS. 2019年12月5日閲覧。
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^ ^a ^b van Genderen, A. M. (2001-02), “S Doradus variables in the Galaxy and the Magellanic Clouds”, Astronomy & Astrophysics 366: 508-531, Bibcode: 2001A&A...366..508V, doi:10.1051/0004-6361:20000022
^ ^a ^b ^c ^d ^e ^f Stahl, O.; et al. (2001-08), “Long-term spectroscopic monitoring of the Luminous Blue Variable AG Carinae”, Astronomy & Astrophysics 375: 54-69, Bibcode: 2001A&A...375...54S, doi:10.1051/0004-6361:20010824
^ ^a ^b ^c ^d ^e Groh, J. H.; Hillier, D. J.; Damineli, A. (2011-07), “On the Nature of the Prototype Luminous Blue Variable AG Carinae. II. Witnessing a Massive Star Evolving Close to the Eddington and Bistability Limits”, Astrophysical Journal 736 (1): 46, Bibcode: 2011ApJ...736...46G, doi:10.1088/0004-637X/736/1/46
^ ^a ^b ^c ^d Groh, J. H.; et al. (2009-06), “On the Nature of the Prototype Luminous Blue Variable AG Carinae. I. Fundamental Parameters During Visual Minimum Phases and Changes in the Bolometric Luminosity During the S-Dor Cycle”, Astrophysical Journal 698 (2): 1698-1720, Bibcode: 2009ApJ...698.1698G, doi:10.1088/0004-637X/698/2/1698
^ ^a ^b ESA (1997), The HIPPARCOS and TYCHO catalogues. Astrometric and photometric star catalogues derived from the ESA HIPPARCOS Space Astrometry Mission, ESA SP Series, 1200, Noordwijk, Netherlands: ESA Publications Division, Bibcode: 1997ESASP1200.....E, ISBN 9290923997
^ ^a ^b Humphreys, Roberta M. (1989), “What are LBV’s? — Their Characteristics and Role in the Upper H-R Diagram”, Astrophysics and Space Science Library 157: 3-14, Bibcode: 1989ASSL..157....3H, doi:10.1007/978-94-009-1031-7_1
^ Wood, H. E. (1914-06), “Discovery of a variable star in Carina”, Monthly Notices of the Royal Astronomical Society 74: 698, Bibcode: 1914MNRAS..74..698W, doi:10.1093/mnras/74.8.698
^ Greenstein, Naomi K. (1938-03), “Four Irregular Variables, AG, T, GG, and ES Carinae”, Harvard College Observatory Bulletin 908: 25-29, Bibcode: 1938BHarO.908...25G
^ Cannon, Annie Jump; Pickering, Edward Charles (1916), “Spectra having bright lines”, Annals of the Astronomical Observatory of Harvard College 76 (3): 19-42, Bibcode: 1916AnHar..76...19C
^ Humphreys, Roberta M.; Davidson, Kris (1994-10), “The Luminous Blue Variables: Astrophysical Geysers”, Publications of the Astronomical Society of the Pacific 106 (704): 1025-1051, Bibcode: 1994PASP..106.1025H, doi:10.1086/133478
^ ^a ^b Smith, L. J.; et al. (1997-09), “The AG Carinae nebula: abundant evidence for a red supergiant progenitor?”, Monthly Notices of the Royal Astronomical Society 290 (2): 265-275, Bibcode: 1997MNRAS.290..265S, doi:10.1093/mnras/290.2.265
^ ^a ^b Voors, R. H. M.; et al. (2000-04), “Infrared imaging and spectroscopy of the Luminous Blue Variables Wra 751 and AG Car”, Astronomy & Astrophysics 351: 501-516, Bibcode: 2000A&A...356..501V
^ “Snapshot of a shedding star”. Hubble Space Telescope. ESA (2014年9月29日). 2019年12月7日閲覧。
^ Thackeray, A. D. (1950), “Some southern stars involved in nebulosity”, Monthly Notices of the Royal Astronomical Society 110: 524-530, Bibcode: 1950MNRAS.110..524T, doi:10.1093/mnras/110.6.524
^ Stahl, O. (1987-08), “Direct imagery of circumstellar shells around Ofpe/WN 9 stars in the galaxy and in LMC”, Astronomy & Astrophysics 182: 229-236, Bibcode: 1987A&A...182..229S
^ ^a ^b ^c Nota, Antonella; et al. (1992-10), “Mapping AG Carinae: Long-Slit Spectroscopy and Coronographic Imaging of the Nebula and Jet”, Astrophysical Journal 398: 621-631, Bibcode: 1992ApJ...398..621N, doi:10.1086/171887
^ Nota, A.; et al. (2002-11), “Detection of ¹²CO J=1-->0 and J=2-->1 Emission from the Luminous Blue Variable AG Carinae: Circumstellar Envelope or Disk?”, Astronomical Journal 124 (5): 2920-2930, Bibcode: 2002AJ....124.2920N, doi:10.1086/343770
^ Duncan, R. A.; White, S. M. (2002-02), “Radio images of four luminous blue variable stars”, Monthly Notices of the Royal Astronomical Society 330 (1): 63-68, Bibcode: 2002MNRAS.330...63D, doi:10.1046/j.1365-8711.2002.05034.x
^ ^a ^b Vamvatira-Nakou, C.; et al. (2015-06), “The Herschel view of the nebula around the luminous blue variable star AG Carinae”, Astronomy & Astrophysics 578: A108, Bibcode: 2015A&A...578A.108V, doi:10.1051/0004-6361/201425090