HD 22764

Last updated
HD 22764
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 22764 on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Camelopardalis [1]
Right ascension 03h 42m 42.73699s [2]
Declination +59° 58 09.8029 [2]
Apparent magnitude  (V)5.78 [3]
Characteristics
Spectral type K3.5 IIIb + G [4]
U−B color index +1.78 [3]
B−V color index +1.76 [3]
R−I color index +1.02 [3]
Astrometry
Radial velocity (Rv)−12.53±0.26 [5] km/s
Proper motion (μ)RA: −2.124 mas/yr [2]
Dec.: +2.342 mas/yr [2]
Parallax (π)1.8433±0.0671  mas [2]
Distance 1,770 ± 60  ly
(540 ± 20  pc)
Absolute magnitude  (MV)−4.47 [6]
Absolute bolometric
magnitude
 (Mbol)
−4.52±0.30 [7]
Details
Mass 2.86 [8] or 6.8±1 [9]   M
Radius 167±8 [10]   R
Luminosity 3,342±221 [11]   L
Surface gravity (log g)1.08 or 1.41 [12]   cgs
Temperature 3,928±170 [7]   K
Metallicity [Fe/H]−0.19 [13]   dex
Rotational velocity (v sin i)<1.9 [14]  km/s
Age 820 [8] or 47±8 [9]   Myr
Other designations
AG+59°378, BD+59°699, HD 22764, HIP 17342, HR 1112, SAO 24169, WDS J03427+5958A [15]
Database references
SIMBAD data

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, [3] 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 [2] but is approaching the Solar System with a heliocentric radial velocity of −12.5  km/s . [5] At its current distance, HD 22764's brightness is diminished by 0.66 magnitudes due to interstellar dust. [6]

The object has two stellar classifications; one states that it is an ageing red giant (K3.5 IIIb) [4] while the other instead lists it as a slightly cooler lower luminosity red supergiant (K4 Ib). [16] 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; [9] if considered as an older giant star, it has a mass of 2.86  M. [8] As a result of its evolved state, HD 22764 has expanded to 167 times the Sun's radius [10] and now radiates 3,342 times the luminosity of the Sun [11] from its photosphere at an effective temperature of 3,928  K . [7] Age estimates range from 47 up to 820 million years. [8] [9] It has an iron abundance 65% that of the Sun, [13] making it metal deficient. The object spins leisurely with a projected rotational velocity lower than 1.9  km/s . [14]

HD 22764 is the primary of a binary star [17] 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. [18]

References

  1. Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 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.
  3. 1 2 3 4 5 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.
  4. 1 2 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.
  5. 1 2 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.
  6. 1 2 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.
  7. 1 2 3 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.
  8. 1 2 3 4 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.
  9. 1 2 3 4 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.
  10. 1 2 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.
  11. 1 2 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.
  12. 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.
  13. 1 2 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.
  14. 1 2 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.
  15. "HD 22764". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved December 16, 2022.
  16. 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.
  17. 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.
  18. 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.