Astronomy:HD 12055
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
| Distance | 249 ± 4 ly (76 ± 1 pc) |
| Absolute magnitude (MV) | 0.42[2] |
| Details | |
| Mass | 2.39[5] M☉ |
| Radius | 10.40+0.46 −0.70[1] R☉ |
| Luminosity | 71.1±1.4[1] L☉ |
| Surface gravity (log g) | 3.04[6] cgs |
| Temperature | 5,196+185 −112[1] K |
| Metallicity [Fe/H] | –0.02[6] dex |
| Rotational velocity (v sin i) | 5.7±1.0[7] km/s |
| Age | 1.08[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 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.
- ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
- ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ 4.0 4.1 Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers 42 (2): 443. Bibcode: 2014JAVSO..42..443M.Vizier catalog entry
- ↑ 5.0 5.1 5.2 5.3 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L.
- ↑ 6.0 6.1 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. doi:10.1093/mnras/stv189. Bibcode: 2015MNRAS.448.2749A.
- ↑ 7.0 7.1 De Medeiros, J. R. et al. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D. Vizier catalog entry
- ↑ "HD 12055". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+12055.
- ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ 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. doi:10.1088/0067-0049/184/1/138. Bibcode: 2009ApJS..184..138H.
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