Double star; Camelopardalis
HD 22764 , also known as HR 1112 , is an orange hued star located in the northern circumpolar constellation Camelopardalis . It has an apparent magnitude of 5.78,[ 2] allowing it to be faintly visible to the naked eye . The object is located relatively far at a distance of approximately 1,770 light years based on Gaia DR3 parallax measurements[ 1] but is approaching the Solar System with a heliocentric radial velocity of −12.5 km/s .[ 4] At its current distance, HD 22764's brightness is diminished by 0.66 magnitudes due to interstellar dust .[ 5]
The object has two stellar classifications ; one states that it is an ageing red giant (K3.5 IIIb)[ 3] while the other instead lists it as a slightly cooler lower luminosity red supergiant (K4 Ib).[ 15] The first spectrum hints a close companion to the object of spectral type G. If considered as a supergiant , it has 6.8 times the mass of the Sun ;[ 8] if considered as an older giant star , it has a mass of 2.86 M ☉ .[ 7] As a result of its evolved state, HD 22764 has expanded to 167 times the Sun's radius [ 9] and now radiates 3,342 times the luminosity of the Sun [ 10] from its photosphere at an effective temperature of 3,928 K .[ 6] Age estimates range from 47 up to 820 million years .[ 7] [ 8] It has an iron abundance 65% that of the Sun ,[ 12] making it metal deficient. The object spins leisurely with a projected rotational velocity lower than 1.9 km/s .[ 13]
HD 22764 is the primary of a binary star [ 16] consisting of it and HD 22763, a B8 giant star located 54.8" away along a position angle of 38°. There are also 4 line-of-sight companions located near the system.[ 17]
References
^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1. arXiv :2208.00211 . Bibcode :2023A&A...674A...1G . doi :10.1051/0004-6361/202243940 . S2CID 244398875 .
Gaia DR3 record for this source at VizieR .
^ a b c d e Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR Online Data Catalog . 2237 . Bibcode :2002yCat.2237....0D .
^ a b Keenan, Philip C.; McNeil, Raymond C. (October 1989). "The Perkins catalog of revised MK types for the cooler stars" . The Astrophysical Journal Supplement Series . 71 : 245. Bibcode :1989ApJS...71..245K . doi :10.1086/191373 . eISSN 1538-4365 . ISSN 0067-0049 .
^ a b Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters" . Astronomy and Astrophysics . 430 : 165. arXiv :astro-ph/0409579 . Bibcode :2005A&A...430..165F . doi :10.1051/0004-6361:20041272 . S2CID 17804304 .
^ a b Mel'nik, A. M.; Dambis, A. K. (30 August 2017). "Kinematics of OB-associations in Gaia epoch" . Monthly Notices of the Royal Astronomical Society . 472 (4): 3887– 3904. arXiv :1708.08337 . Bibcode :2017MNRAS.472.3887M . doi :10.1093/mnras/stx2225 . eISSN 1365-2966 . ISSN 0035-8711 .
^ a b c Messineo, M.; Brown, A. G. A. (18 June 2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2" . The Astronomical Journal . 158 (1): 20. arXiv :1905.03744 . Bibcode :2019AJ....158...20M . doi :10.3847/1538-3881/ab1cbd . eISSN 1538-3881 .
^ a b c d Bertelli, G.; Bressan, A.; Chiosi, C.; Fagotto, F.; Nasi, E. (August 1994). "Theoretical isochrones from models with new radiative opacities". Astronomy and Astrophysics Supplement Series . 106 : 275– 302. Bibcode :1994A&AS..106..275B . ISSN 0365-0138 .
^ a b c d Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (October 12, 2010). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun" . Monthly Notices of the Royal Astronomical Society . 410 (1). Oxford University Press (OUP): 190– 200. arXiv :1007.4883 . Bibcode :2011MNRAS.410..190T . doi :10.1111/j.1365-2966.2010.17434.x . ISSN 0035-8711 .
^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants" . Astronomy & Astrophysics . 426 (1): 297– 307. arXiv :astro-ph/0404180 . Bibcode :2004A&A...426..297K . doi :10.1051/0004-6361:20035930 . eISSN 1432-0746 . ISSN 0004-6361 .
^ a b 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 .
^ Luck, R. Earle (25 August 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 . eISSN 1538-3881 . ISSN 0004-6256 . S2CID 118505114 .
^ a b Luck, R. Earle (2 May 2014). "Parameters and Abundances in Luminous Stars" . The Astronomical Journal . 147 (6): 137. Bibcode :2014AJ....147..137L . doi :10.1088/0004-6256/147/6/137 . eISSN 1538-3881 . ISSN 0004-6256 .
^ a b De Medeiros, J. R.; Udry, S.; Burki, G.; Mayor, M. (29 October 2002). "A catalog of rotational and radial velocities for evolved stars" . Astronomy & Astrophysics . 395 (1): 97– 98. Bibcode :2002A&A...395...97D . doi :10.1051/0004-6361:20021214 . eISSN 1432-0746 . ISSN 0004-6361 .
^ "HD 22764" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved December 16, 2022 .
^ Appenzeller, Immo (April 1967). "MK Spectral Types for 185 Bright Stars" . Publications of the Astronomical Society of the Pacific . 79 (467): 102. Bibcode :1967PASP...79..102A . doi :10.1086/128449 . eISSN 1538-3873 . ISSN 0004-6280 .
^ Eggleton, P. P.; Tokovinin, A. A. (11 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 . eISSN 1365-2966 . ISSN 0035-8711 .
^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog" . The Astronomical Journal . 122 (6): 3466– 3471. Bibcode :2001AJ....122.3466M . doi :10.1086/323920 . ISSN 0004-6256 .