Astronomy:HD 50885

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Short description: Star in the constellation of Camelopardalis
HD 50885
Observation data
Equinox J2000.0]] (ICRS)
Constellation Camelopardalis
Right ascension  07h 01m 21.41899s[1]
Declination +70° 48′ 29.8635″[1]
Apparent magnitude (V) 5.69±0.01[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type K4 III[4]
U−B color index +1.52[2]
B−V color index +1.34[2]
Astrometry
Radial velocity (Rv)−17.8±0.2[5] km/s
Proper motion (μ) RA: +13.101[1] mas/yr
Dec.: −15.749[1] mas/yr
Parallax (π)6.3572 ± 0.0481[1] mas
Distance513 ± 4 ly
(157 ± 1 pc)
Absolute magnitude (MV)−0.27[6]
Details
Mass1.32±0.82[7] M☉
Radius30.43[8] R☉
Luminosity203±3[1] L☉
Surface gravity (log g)1.99[9] cgs
Temperature4,396±122[10] K
Metallicity [Fe/H]+0.01[9] dex
Age292[1] Myr
Other designations
BD+70°430, GC 9152, HD 50885, HIP 33827, HR 2581, SAO 6041, WDS J07014+7049A[11]
Database references
SIMBADdata

HD 50885, also known as HR 2581, is a star located in the northern circumpolar constellation Camelopardalis, the giraffe. It has an apparent magnitude of 5.69,[2] making it faintly visible to the naked eye if viewed under ideal conditions. Based on parallax measurements from Gaia DR3, the object is estimated to be 513 light years distant.[1] It appears to be approaching the Solar System with a heliocentric radial velocity of −17.8 km/s.[5]

This is a solitary,[12] evolved red giant star with a stellar classification of K4 III.[4] It is currently on the red giant branch,[3] fusing a hydrogen shell around an inert helium core. It has 1.32 times the mass of the Sun[7] but has expanded to 30.4 times its girth.[8] It radiates 203 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 4,396 K.[10] HD 50885 has an iron abundance only 102% that of the Sun, placing it at solar metallicity.[9]

There is an optical companion located 119″ away along a position angle of 357°.[13] This object was first noticed by Robert S. Ball in 1879[14]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 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 Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI.". Astronomy and Astrophysics Supplement Series 89: 415. ISSN 0365-0138. Bibcode: 1991A&AS...89..415O. 
  3. ↑ 3.0 3.1 Cardiel, Nicolás; Zamorano, Jaime; Carrasco, Josep Manel; Masana, Eduard; Bará, Salvador; González, Rafael; Izquierdo, Jaime; Pascual, Sergio et al. (23 July 2021). "RGB photometric calibration of 15 million Gaia stars". Monthly Notices of the Royal Astronomical Society 507 (1): 318–329. doi:10.1093/mnras/stab2124. ISSN 0035-8711. Bibcode: 2021MNRAS.507..318C. 
  4. ↑ 4.0 4.1 Wilson, Ralph E.; Joy, Alfred H. (March 1950). "Radial Velocities of 2111 Stars.". The Astrophysical Journal 111: 221. doi:10.1086/145261. ISSN 0004-637X. Bibcode: 1950ApJ...111..221W. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R. et al. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics 633: A34. doi:10.1051/0004-6361/201936360. ISSN 0004-6361. Bibcode: 2020A&A...633A..34C. 
  8. ↑ 8.0 8.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (20 December 2021). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  9. ↑ 9.0 9.1 9.2 Lomaeva, M.; Jönsson, H.; Ryde, N.; Schultheis, M.; Thorsbro, B. (May 2019). "Abundances of disk and bulge giants from high-resolution optical spectra". Astronomy & Astrophysics 625: A141. doi:10.1051/0004-6361/201834247. ISSN 0004-6361. Bibcode: 2019A&A...625A.141L. 
  10. ↑ 10.0 10.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  11. ↑ "HD 50855". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+50855. 
  12. ↑ 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. 
  13. ↑ 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. 
  14. ↑ Ball, Robert S. (1884). "Observations in search of stars with annual parallax". Dunsink Observatory Publications 5: 1–157. Bibcode: 1884DunOP...5....1B. 



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