Astronomy:HD 85951

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Short description: Star in the constellation of Hydra
HD 85951
Location of HD 85951 (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Hydra
Right ascension  09h 54m 52.2045s[1]
Declination −19° 00′ 33.620″[1]
Apparent magnitude (V) 4.94[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type K5 III[4]
U−B color index +1.93[2]
B−V color index +1.57[2]
Astrometry
Radial velocity (Rv)50±4.2[5] km/s
Proper motion (μ) RA: −45.386[1] mas/yr
Dec.: −40.456[1] mas/yr
Parallax (π)5.6789 ± 0.2214[1] mas
Distance570 ± 20 ly
(176 ± 7 pc)
Absolute magnitude (MV)−1.43[6]
Details
Mass6.40+1.2−0.4[7] M☉
Radius56.7[8] R☉
Luminosity721±32[9] L☉
Surface gravity (log g)1.3±0.04[10] cgs
Temperature3,875±39[10] K
Metallicity [Fe/H]−0.18±0.07[10] dex
Other designations
Felis, BD−18°2810, FK5 373, GC 13644, HD 85951, HIP 48615, HR 3923, SAO 155588[11]
Database references
SIMBADdata

HD 85951 (HR 3923), formally named Felis /ˈfiːlɪs/,[12] is a solitary[13] orange hued star in the constellation Hydra. It has an apparent magnitude of 4.94,[2] making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements, the object is about 570 light-years away from the Sun[1] and is receding with a heliocentric radial velocity of 50 km/s.[5]

Nomenclature

HD 85951 was the brightest star in the now-obsolete constellation of Felis, and was designated c Felis in Bode’s star chart.[14] In 2016, the IAU organized a Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. The WGSN approved the name Felis for this star on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.[12]

Properties

HD 85951 is an evolved red giant with a stellar classification of K5 III.[4] It is currently on the asymptotic giant branch,[3] generating energy via fusion of hydrogen and helium shells around an inert carbon core. At present, Felis has 6.4 times the mass of the Sun[7] and, due to its evolved status, has an enlarged radius of 56.7 R☉.[8] It radiates at a bolometric luminosity 721 times that of the Sun[9] from its photosphere at an effective temperature of 3,875 K.[10] Felis has an iron abundance 66% that of the Sun, making it metal deficient.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D. 
  3. ↑ 3.0 3.1 Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal 104: 275. doi:10.1086/116239. ISSN 0004-6256. Bibcode: 1992AJ....104..275E. 
  4. ↑ 4.0 4.1 Houk, N.; Smith-Moore, M. (1988). Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26° to -12°. 4. Bibcode: 1988mcts.book.....H. 
  5. ↑ 5.0 5.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  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 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.
  8. ↑ 8.0 8.1 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. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  9. ↑ 9.0 9.1 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.
  10. ↑ 10.0 10.1 10.2 10.3 Arentsen, Anke; Prugniel, Philippe; Gonneau, Anais; Lançon, Ariane; Trager, Scott; Peletier, Reynier; Lyubenova, Mariya; Chen, Yan-Ping et al. (July 2019). "Stellar atmospheric parameters for 754 spectra from the X-shooter Spectral Library". Astronomy & Astrophysics 627: A138. doi:10.1051/0004-6361/201834273. ISSN 0004-6361. Bibcode: 2019A&A...627A.138A. 
  11. ↑ "HD 85951". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+85951. 
  12. ↑ 12.0 12.1 "Naming Stars". IAU.org. https://www.iau.org/public/themes/naming_stars/. 
  13. ↑ 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. 
  14. ↑ "Star Tales Felis". http://www.ianridpath.com/startales/felis.html. 
  15. ↑ "IAU Working Group on Star Names (WGSN)". https://www.iau.org/science/scientific_bodies/working_groups/280/. 
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