Star in the constellation Aquarius
56 Aquarii , abbreviated 56 Aqr , is a star in the constellation of Aquarius . 56 Aquarii is its Flamsteed designation . It is a sixth magnitude star, having an apparent visual magnitude of 6.36,[ 2] parallax shift of mas [ 1] light years from the Earth. At that distance, the visual magnitude is diminished by an extinction of 0.12 due to interstellar dust .[ 7] radial velocity of −28 km/s.[ 5] runaway star showing a transverse peculiar velocity of 213.87 km/s.[ 9]
Houk and Smith-Moore (1978) gave this star a stellar classification of B8 II,[ 4] B-type bright giant . In contrast, Cowley et al. (1969) found a class of B8 Vs,[ 10] B-type main-sequence star with narrow ("sharp") absorption lines due to a relatively low projected rotation . Zorec and Royer (2012) modeled it as a dwarf star that is 67% of the way through its main sequence lifespan. It is a chemically peculiar mercury-manganese star , showing abnormally strong absorption lines of mercury and magnesium with weak lines of helium.[ 11] [ 3] mass of the Sun and about 2.8[ 6] Sun's radius . It is radiating 185[ 3] Sun's luminosity from its photosphere at an effective temperature of 11,912 K.[ 3]
References
^ a b c d e f 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 ^ a b c d 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 c d e f g h Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics , 537 : A120, arXiv :1201.2052 Bibcode :2012A&A...537A.120Z , doi :10.1051/0004-6361/201117691 , S2CID 55586789 . ^ a b Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode :1988mcts.book.....H . ^ a b Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters , 32 (11): 759– 771, arXiv :1606.08053 Bibcode :2006AstL...32..759G , doi :10.1134/S1063773706110065 , ISSN 1063-7737 , S2CID 119231169 . ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics , 367 (2): 521– 524, arXiv :astro-ph/0012289 Bibcode :2001A&A...367..521P , doi :10.1051/0004-6361:20000451 , S2CID 425754 . ^ a b Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters , 38 (11): 694– 706, arXiv :1606.09028 Bibcode :2012AstL...38..694G , doi :10.1134/S1063773712110035 , S2CID 119108982 . ^ "56 Aqr" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved October 24, 2018 .^ Mdzinarishvili, T. G.; Chargeishvili, K. B. (February 2005), "New runaway OB stars with HIPPARCOS", Astronomy and Astrophysics , 431 (2): L1 – L4 , Bibcode :2005A&A...431L...1M , doi :10.1051/0004-6361:200400134 ^ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal , 74 : 375– 406, Bibcode :1969AJ.....74..375C , doi :10.1086/110819 . ^ Saffe, C.; et al. (October 2011), "Upper Main Sequence Stars with Anomalous Abundances. The HgMn stars HR 3273, HR 8118 HR 8567 and HR 8937", Revista Mexicana de Astronomía y Astrofísica , 47 : 219– 234, Bibcode :2011RMxAA..47..219S .
