Star in the constellation Aquarius
44 Aquarii is a single star located 336 light years away from the Sun in the equatorial constellation of Aquarius . 44 Aquarii is its Flamsteed designation . It is visible to the naked eye as a dim, yellow-hued star with an apparent visual magnitude of 5.75. This body is moving away from the Earth with a heliocentric radial velocity of +7.4 km/s.
A stellar classification of G6 III indicates this is an evolved giant star , most likely (98% chance) on the horizontal branch , having exhausted the hydrogen at its core and expanded. It is a suspected variable star of unknown type. 44 Aquarii is 537 million years old with about 2.53 times the mass of the Sun and 9 times the Sun's radius . The star is radiating 62 times the Sun's luminosity from its photosphere at an effective temperature of 5,025 K. At this heat, the star has the golden-hued glow of a G-type star .
References
^ Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties" . Astronomy & Astrophysics 616 . A1. arXiv :1804.09365 . Bibcode :2018A&A...616A...1G . doi :10.1051/0004-6361/201833051 .Gaia DR2 record for this source at VizieR .
^ Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory , 4 (99): 99, Bibcode :1966CoLPL...4...99J .
^ Takeda, Yoichi; Sato, Bun'ei; Murata, Daisuke (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan , 60 (4): 781–802, arXiv :0805.2434 , Bibcode :2008PASJ...60..781T , doi :10.1093/pasj/60.4.781 , S2CID 16258166 .
^ Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports , 5.1, 61 (1): 80–88, Bibcode :2017ARep...61...80S , doi :10.1134/S1063772917010085 , S2CID 125853869 .
^ Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb , 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode :1999VeARI..35....1W .
^ 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 , S2CID 18759600 .
^ Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics , 515 : A111, arXiv :1004.1069 , Bibcode :2010A&A...515A.111S , doi :10.1051/0004-6361/201014247 , S2CID 118362423 .
Gray, David F. (1989), "The rotational break for G giants", Astrophysical Journal , 347 : 1021–1029, Bibcode :1989ApJ...347.1021G , doi :10.1086/168192 .
^ "* 44 Aqr" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2012-07-16.
Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2): 869, arXiv :0806.2878 , Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x , S2CID 14878976 .
Stock, Stephan; et al. (August 2018), "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search", Astronomy & Astrophysics , 616 : 15, arXiv :1805.04094 , Bibcode :2018A&A...616A..33S , doi :10.1051/0004-6361/201833111 , S2CID 119361866 , A33.
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