Astronomy:HD 85951

From HandWiki
Short description: Star in the constellation of Hydra
HD 85951
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, HIP 48615, HR 3923, SAO 155588[11]
Database references
SIMBADdata

HD 85951 (HR 3923), formally named Felis /ˈflɪs/,[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.[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

This 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. Bibcode2021A&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. Bibcode2002yCat.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. Bibcode1992AJ....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. Bibcode1988mcts.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. Bibcode2006AstL...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. Bibcode2012AstL...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. Bibcode2019AJ....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. Bibcode2018A&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. Bibcode2019A&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. Bibcode2008MNRAS.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/. 
Cite error: <ref> tag with name "Gould1879" defined in <references> is not used in prior text.