Star in the constellation Aquarius
7 Aquarii , abbreviated 7 Aqr , is a binary star [3] zodiac constellation of Aquarius . 7 Aquarii is the Flamsteed designation . It is visible to the naked eye with an apparent visual magnitude of 5.5;[2] [3] angular separation of ″ position angle of 165°.[10] parallax shift of mas [1] light years . It is moving closer to the Earth with a heliocentric radial velocity of −32 km/s.[7]
The primary component is an aging giant star with a stellar classification of K4 III.[4] variable star of unknown type with a maximum magnitude of 5.48.[6] interferometry -measured angular diameter of this star, after correcting for limb darkening , is ± 0.02 mas[11] radius of the Sun .[8] [5] Sun's luminosity from its enlarged photosphere at an effective temperature of 3,990 K.[2]
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 e f McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I. Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series , 74 : 1075–1128, Bibcode :1990ApJS...74.1075M , doi :10.1086/191527 ^ a b c Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2): 869–879, arXiv :0806.2878 Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x , S2CID 14878976 . ^ 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 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 Samus, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017), "General Catalogue of Variable Stars", Astronomy Reports , GCVS 5.1, 61 (1): 80–88, Bibcode :2017ARep...61...80S , doi :10.1134/S1063772917010085 , S2CID 125853869 . ^ 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 , S2CID 119231169 . ^ a b Lang, Kenneth R. (2006), Astrophysical formulae Birkhäuser , ISBN 3-540-29692-1 * ) is given by:
2
⋅
R
∗
=
(
10
−
3
⋅
202
⋅
2.14
)
AU
0.0046491
AU
/
R
⨀
≈
93
⋅
R
⨀
{\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 202\cdot 2.14)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 93\cdot R_{\bigodot }\end{aligned}}}
^ "7 Aqr" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved October 22, 2018 .^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal , 122 (6): 3466, Bibcode :2001AJ....122.3466M , doi :10.1086/323920 ^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics , 431 (2): 773–777, Bibcode :2005A&A...431..773R , doi :10.1051/0004-6361:20042039
External links
This page was last edited on 13 August 2023, at 04:46
This page was last edited on 13 August 2023, at 04:46