Vega (zvezda)

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Vega
Vega in lyra.svg
Lega Vege v ozvezdju Lire
Opazovalni podatki
Epoha J2000.0      Enakonočje J2000.0
Ozvezdje Lira
Rektascenzija 18h 36m 56,33635s[1]
Deklinacija +38° 47′ 01,2802″[1]
Navidezni sij (V) +0,026[2] (−0.02…+0.07[3])
Značilnosti
Evolucijska stopnja Glavni niz
Spektralni razred A0 Va[4]
U−B Barvni indeks 0,00[5]
B−V Barvni indeks 0,00[5]
Tip spremenljivke Delta Scuti[3]
Astrometrija
Radialna hitrost (Rv)13,9 ± 0,9[6] km/s
Lastno gibanje (μ)RA: 200,94[1] mas/l
Dec.: 286,23[1] mas/l
Paralaksa (π)130,23 ± 0,36[1] mas
Oddaljenost25.04 ± 0.07 sv. l.
(7.68 ± 0.02 pc)
Absolutni izsev (MV)+0,582[7]
Podrobnosti
Masa2,135 ± 0,074[8] M
Polmer2,362 × 2,818[8] R
Izsev40,12 ± 0,45[8] L
Površinska težnost (log g)4,1 ± 0,1[9] cgs
Temperatura9.602 ± 180[10] (8.152–10.060 K)[8][note 1] K
Kovinskost [Fe/H]−0,5[10] dex
Tirna hitrost(v sin i)20,48 ± 0,11[8] km/s
Starost455 ± 13[8] Ma
Druge oznake
Wega,[11] Lucida Lyrae,[12] Alpha Lyrae, α Lyrae, 3 Lyrae, BD+38°3238, GCTP 4293.00, HD 172167, GJ 721, HIP 91262, HR 7001, LTT 15486, SAO 67174,[13]
Sklici na podatkovne baze
SIMBADpodatki

Vega (α Lyr, α Lyrae, Alfa Lire) je najsvetlejša zvezda v ozvezdju Lire (latinsko Lyrae), 5. najsvetlejša zvezda na nočnem nebu in 2. najsvetlejša na severni nebesni polobli, za Arkturjem. Je zelo blizu Osončju (25 svetlobnih let), in, skupaj z Arkturjem in Sirijem, ena najbolj svetlih zvezd v Sončevi soseski.

Ime[uredi | uredi kodo]

Ime Wega (pozneje Vega) prihaja iz približne transkripcije arabske besede wāqi‘, ki pomeni »padati« ali »pristati«, preko fraze an-nasr al-wāqi‘, »padajoči orel«. Ime nima nobene povezave s slovenskim znanstvenikom Jurijem Vego.

Opombe[uredi | uredi kodo]

  1. The polar temperature is around 2.000 K higher than at the equator due to the rapid rotation of Vega


Sklici[uredi | uredi kodo]

  1. 1,0 1,1 1,2 1,3 1,4 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. Bohlin, R. C.; Gilliland, R. L. (2004). "Hubble Space Telescope Absolute Spectrophotometry of Vega from the Far-Ultraviolet to the Infrared". The Astronomical Journal. 127 (6): 3508–3515. Bibcode:2004AJ....127.3508B. doi:10.1086/420715.
  3. 3,0 3,1 Samus, N. N.; Durlevich, O. V.; et al. (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.
  4. Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I". The Astronomical Journal. 126 (4): 2048. arXiv:astro-ph/0308182. Bibcode:2003AJ....126.2048G. doi:10.1086/378365.
  5. 5,0 5,1 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. Bibcode:2002yCat.2237....0D.
  6. Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". Proceedings from IAU Symposium no. 30. Determination of Radial Velocities and Their Applications. 30. London, England. str. 57. Bibcode:1967IAUS...30...57E.
  7. Gatewood, George (2008). "Astrometric Studies of Aldebaran, Arcturus, Vega, the Hyades, and Other Regions". The Astronomical Journal. 136 (1): 452–460. Bibcode:2008AJ....136..452G. doi:10.1088/0004-6256/136/1/452.
  8. 8,0 8,1 8,2 8,3 8,4 8,5 Yoon, Jinmi; et al. (January 2010). "A New View of Vega's Composition, Mass, and Age". The Astrophysical Journal. 708 (1): 71–79. Bibcode:2010ApJ...708...71Y. doi:10.1088/0004-637X/708/1/71.
  9. Aufdenberg, J.P.; et al. (2006). "First results from the CHARA Array: VII. Long-Baseline Interferometric Measurements of Vega Consistent with a Pole-On, Rapidly Rotating Star?". Astrophysical Journal. 645 (1): 664–675. arXiv:astro-ph/0603327. Bibcode:2006ApJ...645..664A. doi:10.1086/504149.
  10. 10,0 10,1 Kinman, T.; et al. (2002). "The determination of Teff for metal-poor A-type stars using V and 2MASS J, H and K magnitudes". Astronomy and Astrophysics. 391 (3): 1039–1052. Bibcode:2002A&A...391.1039K. doi:10.1051/0004-6361:20020806.
  11. Allen, Richard Hinckley (1963). Star Names: Their Lore and Meaning. Courier Dover Publications. ISBN 978-0-486-21079-7.
  12. Kendall, E. Otis (1845). Uranography: Or, A Description of the Heavens; Designed for Academics and Schools; Accompanied by an Atlas of the Heavens. Philadelphia: Oxford University Press.
  13. Staff. "V* alf Lyr – Variable Star". SIMBAD. Pridobljeno dne 2007-10-30.—use the "display all measurements" option to show additional parameters.

Zunanje povezave[uredi | uredi kodo]

  • Več gradiva o temi Vega v Wikimedijini zbirki

Koordinati: Sky map 18h 36m 56.3364s, +38° 47′ 01.291″