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altair

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altair

altair is the brightest star in the constellation of Aquila and the twelfth-brightest star in the night sky. It has the Bayer designation Alpha Aquilae, which is Latinised from α Aquilae and abbreviated Alpha Aql or α Aql. Altair is an A-type main-sequence star with an apparent visual magnitude of 0.77 and is one of the vertices of the Summer Triangle asterism; the other two vertices are marked by Deneb and Vega.[5][13][14] It is located at a distance of 16.7 light-years (5.1 parsecs) from the Sun.[15]: 194  Altair is currently in the G-cloud—a nearby interstellar cloud, an accumulation of gas and dust.[16][17]

Altair rotates rapidly, with a velocity at the equator of approximately 286 km/s.[nb 2][10] This is a significant fraction of the star’s estimated breakup speed of 400 km/s.[18] A study with the Palomar Testbed Interferometer revealed that Altair is not spherical, but is flattened at the poles due to its high rate of rotation.[19] Other interferometric studies with multiple telescopes, operating in the infrared, have imaged and confirmed this phenomenon.[10]

References

  1. ^ “Altair: definition of Altair in Oxford dictionary (American English)”. Archived from the original on May 12, 2014.
  2. Jump up to:a b Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
  3. Jump up to:a b c d e van Leeuwen, F. (November 2007), “Validation of the new Hipparcos reduction”, Astronomy and Astrophysics474 (2): 653–664, arXiv:0708.1752Bibcode:2007A&A…474..653Vdoi:10.1051/0004-6361:20078357S2CID 18759600
  4. Jump up to:a b c d e Ducati, J. R. (2002). “VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson’s 11-color system”. CDS/ADC Collection of Electronic Catalogues2237: 0. Bibcode:2002yCat.2237….0D.
  5. Jump up to:a b c d NAME ALTAIR — Variable Star of delta Sct type, database entry, SIMBAD. Accessed on line November 25, 2008.
  6. Jump up to:a b c d e Buzasi, D. L.; Bruntt, H.; Bedding, T. R.; Retter, A.; Kjeldsen, H.; Preston, H. L.; Mandeville, W. J.; Suarez, J. C.; Catanzarite, J. (February 2005). “Altair: The Brightest δ Scuti Star”. The Astrophysical Journal619 (2): 1072–1076. arXiv:astro-ph/0405127Bibcode:2005ApJ…619.1072Bdoi:10.1086/426704ISSN 0004-637XS2CID 16524681.
  7. Jump up to:a b c d e f g Bouchaud, K.; Domiciano De Souza, A.; Rieutord, M.; Reese, D. R.; Kervella, P. (2020). “A realistic two-dimensional model of Altair”. Astronomy and Astrophysics633: A78. arXiv:1912.03138Bibcode:2020A&A…633A..78Bdoi:10.1051/0004-6361/201936830S2CID 208857428.

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