Double star system in the constellation Aquarius
HD 222093 is a double star in the equatorial constellation of Aquarius . It has an orange hue and is visible to the naked eye with an apparent visual magnitude of 5.68.[ 2] light years from the Sun based on parallax , but is drifting closer with a radial velocity of −13 km/s.[ 1]
The primary component is an aging K-type giant star with a stellar classification of K0III,[ 5] core then cooled and expanded. At present it has ten[ 1] Sun's radius . This is a red clump giant,[ 9] horizontal branch and is generating energy through helium fusion at its core . It is around three billion years old with 1.5 times the mass of the Sun .[ 6] Sun's luminosity from its swollen photosphere at an effective temperature of 4,853 K.[ 1]
According to Eggleton and Tokovinin (2008), this is most likely a wide binary star system; the secondary companion is a magnitude 9.6 star at an angular separation of ″ [ 3] Washington Visual Double Star Catalog gives a magnitude of 11.19 with an angular separation of [ 4]
References
^ a b c d e f g h i j k l 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for this source at VizieR .^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD , Bibcode :1986EgUBV........0M . ^ a b 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 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 , retrieved 2015-07-22 . ^ 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 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal , 150 (3): 88, arXiv :1507.01466 Bibcode :2015AJ....150...88L , doi :10.1088/0004-6256/150/3/88 , S2CID 118505114 . ^ a b c Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal , 135 (1): 209– 231, Bibcode :2008AJ....135..209M , doi :10.1088/0004-6256/135/1/209 ^ "HD 222093" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2019-11-20 .^ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal , 539 (2): 732– 741, arXiv :astro-ph/0003329 Bibcode :2000ApJ...539..732A , doi :10.1086/309278 , S2CID 16673121 .
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