Astronomy:HD 22764

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Short description: Double star; Camelopardalis
HD 22764
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 22764 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Camelopardalis
Right ascension  03h 42m 42.73699s[1]
Declination +59° 58′ 09.8029″[1]
Apparent magnitude (V) 5.78[2]
Characteristics
Spectral type K3.5 IIIb + G[3]
U−B color index +1.78[2]
B−V color index +1.76[2]
R−I color index +1.02[2]
Astrometry
Radial velocity (Rv)−12.53±0.26[4] km/s
Proper motion (μ) RA: −2.124[1] mas/yr
Dec.: +2.342[1] mas/yr
Parallax (π)1.8433 ± 0.0671[1] mas
Distance1,770 ± 60 ly
(540 ± 20 pc)
Absolute magnitude (MV)−4.47[5]
Absolute bolometric
magnitude (Mbol)		−4.52±0.30[6]
Details
Mass2.86[7] or 6.8±1[8] M☉
Radius167±8[9] R☉
Luminosity3,342±221[10] L☉
Surface gravity (log g)1.08 or 1.41[11] cgs
Temperature3,928±170[6] K
Metallicity [Fe/H]−0.19[12] dex
Rotational velocity (v sin i)<1.9[13] km/s
Age820[7] or 47±8[8] Myr
Other designations
BD+59°699, HD 22764, HIP 17342, HR 1112, SAO 24169, WDS J03427+5958A[14]
Database references
SIMBADdata

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

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system.". VizieR Online Data Catalog. Bibcode: 2002yCat.2237....0D. 
  3. ↑ 3.0 3.1 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. doi:10.1086/191373. ISSN 0067-0049. Bibcode: 1989ApJS...71..245K. 
  4. ↑ 4.0 4.1 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. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F. 
  5. ↑ 5.0 5.1 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. doi:10.1093/mnras/stx2225. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3887M. 
  6. ↑ 6.0 6.1 6.2 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. doi:10.3847/1538-3881/ab1cbd. Bibcode: 2019AJ....158...20M. 
  7. ↑ 7.0 7.1 7.2 7.3 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. ISSN 0365-0138. Bibcode: 1994A&AS..106..275B. 
  8. ↑ 8.0 8.1 8.2 8.3 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 (Oxford University Press (OUP)) 410 (1): 190–200. doi:10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711. Bibcode: 2011MNRAS.410..190T. 
  9. ↑ 9.0 9.1 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. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  10. ↑ 10.0 10.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  11. ↑ Luck, R. Earle (25 August 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal 150 (3): 88. doi:10.1088/0004-6256/150/3/88. ISSN 0004-6256. Bibcode: 2015AJ....150...88L. 
  12. ↑ 12.0 12.1 Luck, R. Earle (2 May 2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal 147 (6): 137. doi:10.1088/0004-6256/147/6/137. ISSN 0004-6256. Bibcode: 2014AJ....147..137L. 
  13. ↑ 13.0 13.1 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. doi:10.1051/0004-6361:20021214. ISSN 0004-6361. Bibcode: 2002A&A...395...97D. 
  14. ↑ "HD 22764". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+22764. 
  15. ↑ Appenzeller, Immo (April 1967). "MK Spectral Types for 185 Bright Stars". Publications of the Astronomical Society of the Pacific 79 (467): 102. doi:10.1086/128449. ISSN 0004-6280. Bibcode: 1967PASP...79..102A. 
  16. ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  17. ↑ 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. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M. 



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