HD 12055

HD 12055 is a candidate astrometric binary[9] star system in the southern constellation of Phoenix, near the eastern constellation border with Eridanus. It is yellow in hue and is visible to the naked eye with an apparent visual magnitude of 4.82.[2] The system is located at a distance of approximately 249 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +13 km/s.[1]

HD 12055
Location of HD 12055 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Phoenix
Right ascension 01h 57m 10.08491s[1]
Declination −47° 23′ 07.0936″[1]
Apparent magnitude (V) 4.82[2]
Characteristics
Spectral type G6III-IIIb[3]
U−B color index +0.51[4]
B−V color index +0.88[4]
Astrometry
Radial velocity (Rv)+13.36±0.22[1] km/s
Proper motion (μ) RA: +102.213[1] mas/yr
Dec.: +16.301[1] mas/yr
Parallax (π)13.1010 ± 0.2295[1] mas
Distance249 ± 4 ly
(76 ± 1 pc)
Absolute magnitude (MV)0.42[2]
Details
Mass2.39[5] M☉
Radius10.40+0.46
−0.70[1] R☉
Luminosity71.1±1.4[1] L☉
Surface gravity (log g)3.04[6] cgs
Temperature5,196+185
−112[1] K
Metallicity [Fe/H]–0.02[6] dex
Rotational velocity (v sin i)5.7±1.0[7] km/s
Age1.08[5] Gyr
Other designations
CD−47°597, GC 2369, HD 12055, HIP 9095, HR 574, SAO 215715[8]
Database references
SIMBADdata

The visible component is an aging giant star with a stellar classification of G6III-IIIb.[3] With the supply of hydrogen at its core exhausted, the star has cooled and expanded off the main sequence – at present it has ten[1] times the girth of the Sun. It is around a billion[5] years old with 2.4[5] times the mass of the Sun and is spinning with a projected rotational velocity of 6 km/s.[7] The star is radiating 71 times the luminosity of the Sun from its photosphere at an effective temperature of 5,196 K.[1]

This system is the most likely source of X-ray emission coming from these coordinates.[10]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. 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. Vizier catalog entry
  3. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  5. Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88.
  6. Alves, S.; et al. (April 2015). "Determination of the spectroscopic stellar parameters for 257 field giant stars". Monthly Notices of the Royal Astronomical Society. 448 (3): 2749–2765. arXiv:1503.02556. Bibcode:2015MNRAS.448.2749A. doi:10.1093/mnras/stv189.
  7. De Medeiros, J. R.; et al. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. Vizier catalog entry
  8. "HD 12055". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-13.
  9. 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.
  10. 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.
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