Astronomy: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 |
Distance | 570 ± 20 ly (176 ± 7 pc) |
Absolute magnitude (MV) | −1.43[6] |
Details | |
Mass | 6.40+1.2−0.4[7] M☉ |
Radius | 56.7[8] R☉ |
Luminosity | 721±32[9] L☉ |
Surface gravity (log g) | 1.3±0.04[10] cgs |
Temperature | 3,875±39[10] K |
Metallicity [Fe/H] | −0.18±0.07[10] dex |
Other designations | |
Database references | |
SIMBAD | data |
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.[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
- ↑ 1.0 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.
- ↑ 2.0 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.
- ↑ 3.0 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.
- ↑ 4.0 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.
- ↑ 5.0 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.
- ↑ 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.
- ↑ 7.0 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.
- ↑ 8.0 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.
- ↑ 9.0 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.
- ↑ 10.0 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.
- ↑ "HD 85951". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+85951.
- ↑ 12.0 12.1 "Naming Stars". IAU.org. https://www.iau.org/public/themes/naming_stars/.
- ↑ 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.
- ↑ "Star Tales Felis". http://www.ianridpath.com/startales/felis.html.
- ↑ "IAU Working Group on Star Names (WGSN)". https://www.iau.org/science/scientific_bodies/working_groups/280/.
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Original source: https://en.wikipedia.org/wiki/HD 85951.
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