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HD 15920

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Giant star in the constellation Cassiopeia
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HD 15920
Observation data
Epoch J2000.0Equinox ICRS
Constellation Cassiopeia [1]
Right ascension 02h 38m 02.03317s[2]
Declination +72°49′05.7106′′[2]
Apparentmagnitude(V) 5.17[1]
Characteristics
Evolutionarystage red giant branch [2]
Spectraltype G8III[3]
B−V color index +0.896±0.003[1]
Astrometry
Radial velocity (Rv)−3.81±0.12[2] km/s
Proper motion (μ) RA:−27.072[2] mas/yr
Dec.:+15.618[2] mas/yr
Parallax (π)12.1337±0.0717mas [2]
Distance 269 ± 2ly
(82.4 ± 0.5pc)
Absolutemagnitude(MV)0.70[1]
Details
Mass 2.55±0.68[4] M☉
Radius 10.26±0.73[5] R☉
Luminosity 64+6
−5[5] L☉
Surface gravity (logg)2.91±0.11[4] cgs
Temperature 5,104±148[5] K
Metallicity [Fe/H]0.02±0.05[4] dex
Age 977+198
−164[4] Myr
Other designations
BD+72°140, FK5 87, GC 3116, HD 15920, HIP 12273, HR 743, SAO 4694, GSC 04320-02109[6]
Database references
SIMBAD data

HD 15920 is a single[7] star in the northern constellation of Cassiopeia. It has a yellow hue and is visible to the naked eye as a dim point of light with an apparent visual magnitude of 5.17.[1] This object is located at a distance of approximately 269 light years from the Sun based on parallax, but it is drifting closer with a radial velocity of −4 km/s.[2]

This object is an aging giant star with a stellar classification of G8III.[3] After exhausting the supply of hydrogen at its core, this star has cooled and expanded off the main sequence – at present it has ten times the girth of the Sun.[5] The star is around a billion years old with 2.6 times the mass of the Sun.[4] It is radiating 64 times the Sun's luminosity from its swollen photosphere at an effective temperature of 5,104K .[5] HD 15920 is the most likely source for the X-ray emission detected at these coordinates.[8]

References

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  1. 1 2 3 4 5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971 , Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  2. 1 2 3 4 5 6 7 8 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 Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal, 116: 122, Bibcode:1952ApJ...116..122R, doi:10.1086/145598 .
  4. 1 2 3 4 5 Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817 (1): 40, arXiv:1511.04088 , Bibcode:2016ApJ...817...40F, doi:10.3847/0004-637X/817/1/40 , S2CID 118675933.
  5. 1 2 3 4 5 Yu, Jie; Khanna, Shourya; Themessl, Nathalie; Hekker, Saskia; Dréau, Guillaume; Gizon, Laurent; Bi, Shaolan (2023). "Revised Extinctions and Radii for 1.5 Million Stars Observed by APOGEE, GALAH, and RAVE". The Astrophysical Journal Supplement Series. 264 (2): 41. arXiv:2206.00046 . Bibcode:2023ApJS..264...41Y. doi:10.3847/1538-4365/acabc8 .
  6. ↑ "HD 15920". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019年11月16日.
  7. ↑ Eggleton, P. P.; Tokovinin, A. A. (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 , S2CID 14878976.
  8. ↑ Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229 , Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138, S2CID 119267456.

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