Antares

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Antares A/B
Scorpius constellation map.svg
The poseetion o Antares in the Scorpius constellation.
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Richt ascension 16h 29m 24s[1]
Declination −26° 25′ 55″[1]
Apparent magnitude (V) +0.96[2]
Characteristics
Spectral type M1.5Iab-b + B2.5V[3]
U−B colour index +1.34[2]
B−V colour index +1.83[2]
Variable type LC[4]
Astrometry
Radial velocity (Rv) −3.4[5] km/s
Proper motion (μ) RA: −12.11[1] mas/yr
Dec.: −23.30[1] mas/yr
Parallax (π) 5.89 ± 1.00[1] mas
Distance approx. 550 ly
(approx. 170 pc)
Absolute magnitude (MV) −5.28
Details
A
Mass 12.4[6] M
Radius 883[6] R
Luminosity 57,500[7] L
Surface gravity (log g) 0.1[6]
Temperatur 3400 ± 200[7] K
Rotational velocity (v sin i) 20[8] km/s
B
Mass 10 M
Radius 4 R
Temperatur 18,500[7] K
Ither designations
α Scorpii, 21 Sco,[3] Cor Scorpii, Kalb al Akrab, Scorpion's Heart, Vespertilio,[9] HR 6134, CD -26°11359, HD 148478, SAO 184415, FK5 616, WDS 16294-2626, CCDM J16294-2626A/B, HIP 80763.[3]
Database references
SIMBAD data

Antares (α Scorpii, α Sco, Alpha Scorpii) is a reid supergiant starn in the Milky Way galaxy an the saxteent brichtest starn in the nichttime sky. (It is sometimes leetit as 15t brichtest, if the twa brichter components o the Capella quadruple starn seestem are coontit as ane starn). (Alang wi Aldebaran, Regulus, an Fomalhaut, Antares comprises the group kent as the 'Ryal starns o Persie'.) It is ane o the fower brichtest starns near the ecliptic. It is the brichtest starn in the constellation Scorpius, an is eften referred tae as "the heart o the scorpion". Antares is a slaw variable starn wi an average magnitude o +1.09.[3] Antares is the brichtest, maist massive, an maist evolved stellar member o the nearest OB association (the Scorpius-Centaurus Association). Antares is a member o the Upper Scorpius subgroup o the Scorpius-Centaurus Association, which contains thoosands o starns wi mean age 11 million years at a distance o approximately 145 parsecs (470 licht years).[10]

References[eedit | eedit soorce]

  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. 2.0 2.1 2.2 Nicolet, B. (1978). "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System". Astronomy and Astrophysics Supplement Series 34: 1–49. Bibcode:1978A&AS...34....1N. 
  3. 3.0 3.1 3.2 3.3 "ANTARES -- Double or multiple star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2011-12-31. 
  4. "Query= alf Sco". General Catalogue of Variable Stars. Centre de Données astronomiques de Strasbourg. Retrieved 2010-01-05. 
  5. Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; John Frederick, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E 
  6. 6.0 6.1 6.2 Baade, R.; Reimers, D. (October 2007). "Multi-component absorption lines in the HST spectra of α Scorpii B". Astronomy and Astrophysics 474 (1): 229–237. Bibcode:2007A&A...474..229B. doi:10.1051/0004-6361:20077308. 
  7. 7.0 7.1 7.2 Schröder, K.-P.; Cuntz, M. (April 2007), "A critical test of empirical mass loss formulas applied to individual giants and supergiants", Astronomy and Astrophysics 465 (2): 593–601, arXiv:astro-ph/0702172, Bibcode:2007A&A...465..593S, doi:10.1051/0004-6361:20066633 
  8. HR 6134, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID [1]. Accessed on line September 07, 2012.
  9. Allen, Richard Hinckley (1899). Star-names and their meanings. G. E. Stechert. pp. 364–367. Retrieved 2011-12-31. 
  10. Mark J. Pecaut, Eric E. Mamajek, & Eric J. Bubar (February 2012). "A Revised Age for Upper Scorpius and the Star Formation History among the F-type Members of the Scorpius-Centaurus OB Association". Astrophysical Journal 746 (2): 154. arXiv:1112.1695. Bibcode:2012ApJ...746..154P. doi:10.1088/0004-637X/746/2/154.