VY Canis Majoris

Frae Wikipedia, the free beuk o knawledge
VY Canis Majoris
Sun and VY Canis Majoris.svg

Size comparison atween the Sun an VY Canis Majoris
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Richt ascension 07h 22m 58.32877s[1]
Declination −25° 46′ 03.2355″[1]
Apparent magnitude (V) 6.5 to 9.6[2]
Spectral type M3[4]-M5e Ia[5]
B−V colour index 2.24[4]
Variable teep Semiregular[6]
Radial velocity (Rv)49 ± 10[4] km/s
Proper motion (μ) RA: 9.84[4] mas/yr
Dec.: 0.75[4] mas/yr
Parallax (π)0.83 ± 0.1[7] mas
Distance~3,840 ly
(1,170[8] [9] pc)
Mass17 ± 8[8] M
Radius1420 ± 120[8] R
Luminosity~270,000[8] L
Surface gravity (log g)-0.6[8] cgs
Temperatur~3,490[8] K
Ither designations

VY Canis Majoris (VY CMa) is a reid hypergiant in the constellation Canis Major. It is ane o the lairgest kent starns bi radius an an aa ane o the maist luminous o its type. It is approximately 1,420 ± 120 solar radii[8] (equal tae 6.6 astronomical units, sicweys a diameter aboot 1,975,000,000 kilometres (1.227×109 mi)), an aboot 1.2 kiloparsec (3,900 light-year) distant frae Yird. VY CMa is a single starn categorized as a semiregular variable an haes an estimatit period o 2,000 days. It haes an average density o 5 tae 10 mg/m3. If placed at the centre o the Solar Seestem, VY Canis Majoris's surface wad extend ayond the orbit o Jupiter, altho thare is still considerable variation in estimates o the radius, wi some makin it lairger than the orbit o Saturn.[10]

References[eedit | eedit soorce]

  1. a b "SIMBAD basic query result: VY Canis Majoris". SIMBAD, Centre de Données astronomiques de Strasbourg. Retrieved 23 Januar 2013.
  2. "GCVS Query=VY CMa". General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia. Retrieved 24 November 2010.
  3. a b "Hipparchos catalogue: query form". CASU Astronomical Data Centre. Cambridge Astronomical Survey Unit. 2006. Archived frae the original on 3 Mairch 2016. Retrieved 10 Mairch 2009.
  4. a b c d e "SIMBAD basic query result: VY Canis Majoris". SIMBAD, Centre de Données astronomiques de Strasbourg. Retrieved 7 Mairch 2009.
  5. a b Lipscy, S. J.; Jura, M.; Reid, M. J. (10 Juin 2005). "Radio photosphere and mass-loss envelope of VY Canis Majoris". The Astrophysical Journal. The American Astronomical Society. 626 (1): 439–445. arXiv:astro-ph/0502586. Bibcode:2005ApJ...626..439L. doi:10.1086/429900.
  6. Monnier, J. D.; Geballe, T. R.; Danchi, W. C. (1 August 1998). "Temporal variations of midinfrared spectra in late-type stars". The Astrophysical Journal. American Astronomical Society. 502 (2): 833–846. arXiv:astro-ph/9803027. Bibcode:1998ApJ...502..833M. doi:10.1086/305945.
  7. "Distance and Kinematics of the Red Hypergiant VY CM". Retrieved 19 Mey 2012.
  8. a b c d e f g Wittkowski, M.; Hauschildt, P.H.; Arroyo-Torres, B.; Marcaide, J.M. (5 Apryle 2012). "Fundamental properties and atmospheric structure of the red supergiant VY CMa based on VLTI/AMBER spectro-interferometry". Astronomy & Astrophysics. 540: L12. arXiv:1203.5194. Bibcode:2012A&A...540L..12W. doi:10.1051/0004-6361/201219126.
  9. Y. K. Choi; Hirota, Tomoya; Honma, Mareki; Kobayashi, Hideyuki; Bushimata, Takeshi; Imai, Hiroshi; Iwadate, Kenzaburo; Jike, Takaaki; Kameno, Seiji (2008). "Distance to VY VMa with VERA". Publications of the Astronomical Society of Japan. Publications Astronomical Society of Japan. 60: 1007. arXiv:0808.0641. Bibcode:2008PASJ...60.1007C.
  10. Massey, Philip; Levesque, Emily M.; Plez, Bertrand (1 August 2006). "Bringing VY Canis Majoris down to size: an improved determination of its effective temperature". The Astrophysical Journal. 646 (2): 1203–1208. arXiv:astro-ph/0604253. Bibcode:2006ApJ...646.1203M. doi:10.1086/505025.