Binary star in the constellation Aquarius
29 Aquarii is a binary star system located around 590 light years away from the Sun in the equatorial constellation of Aquarius . 29 Aquarii is the Flamsteed designation ; the system also bears the variable star designation DX Aquarii . It is a challenge to view with the naked eye, appearing as a dim star with a combined apparent visual magnitude of 6.39.[ 3] radial velocity of about +15 km/s.[ 3]
This is a spectroscopic binary system with a close circular orbit taking just 0.945 days to complete.[ 6] contact binary system.[ 8] orbital plane of the two stars lies near the line of sight, so they form an Algol-type eclipsing binary . The first component of the system is an A-type main sequence star with a stellar classification of A2 V. Its companion is giant star with a classification of K0 III.[ 4]
The variability of this system was first noticed in 1965 by W. Strohmeier of Remeis-Observatory in Bamberg , Germany .[ 9] [ 10]
References
^ Molik, Petr. "Eclipsing binary DX Aqr" . Sun Hill Observatory . Retrieved 16 October 2021 . ^ a b c d 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 .^ a b c d e Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters , 38 (5): 331, arXiv :1108.4971 Bibcode :2012AstL...38..331A , doi :10.1134/S1063773712050015 , S2CID 119257644 . ^ a b Zasche, P.; et al. (August 2009), "A Catalog of Visual Double and Multiple Stars With Eclipsing Components", The Astronomical Journal , 138 (2): 664– 679, arXiv :0907.5172 Bibcode :2009AJ....138..664Z , doi :10.1088/0004-6256/138/2/664 , S2CID 17089387 . ^ 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 . ^ a b Paffhausen, W.; Seggewiss, W. (April 1976), "Spectroscopic orbits of the eclipsing binaries DV and CX Aqr", Astronomy and Astrophysics, Supplemental Series , 24 : 29– 34, Bibcode :1976A&AS...24...29P . ^ "BD-17 6422 -- Spectroscopic binary" , SIMBAD Astronomical Object Database , Centre de Données astronomiques de Strasbourg , retrieved 2012-07-16 .^ Rucinski, Slavek M. (October 2002), "The 7.5 Magnitude Limit Sample of Bright Short-Period Binary Stars. I. How Many Contact Binaries Are There?", The Publications of the Astronomical Society of the Pacific , 114 (800): 1124– 1142, arXiv :astro-ph/0207144 Bibcode :2002PASP..114.1124R , doi :10.1086/342677 , S2CID 119453008 . ^ Strohmeier, W.; et al. (1965). "Bright Southern BV-Stars" . Information Bulletin on Variable Stars . 81 : 1. Bibcode :1965IBVS...81....1S . ^ Strohmeier, W. (1966). "BV 449 and BV 600, Two Bright EB-Stars" . Information Bulletin on Variable Stars . 164 : 1. Bibcode :1966IBVS..164....1S . Archived from the original on August 18, 2013.
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