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12 Trianguli 
Summary
12 Trianguli is a solitary[10] star located in the northern constellation Triangulum, with an apparent magnitude of 5.37,[2] making it faintly visible to the naked eye under ideal conditions. The star is situated 160 light years[1] away but is approaching with a heliocentric radial velocity of −24.8 km/s.[7][6] It is calculated to be about 2.19 Gyr old[6] with a stellar classification of F0 III,[3][4][5][6] making it an F-type giant. It has 1.6 times the mass of the Sun[2] and shines at 14 times the luminosity of the Sun[2] from its photosphere at an effective temperature of 7,199 K.[2]
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Triangulum |
| Right ascension | 02h 28m 09.980s[1] |
| Declination | +29° 40′ 09.59″[1] |
| Apparent magnitude (V) | 5.37[2] |
| Characteristics | |
| Spectral type | F0 III[3][4][5][6] |
| B−V color index | +0.29[6] |
| Astrometry | |
| Radial velocity (Rv) | −24.8±2.8[7][6] km/s |
| Proper motion (μ) | RA: −15.632[1] mas/yr Dec.: −86.097[1] mas/yr |
| Parallax (π) | 20.4105 ± 0.0942 mas[1] |
| Distance | 159.8 ± 0.7 ly (49.0 ± 0.2 pc) |
| Details | |
| Mass | 1.6[2] M☉ |
| Luminosity | 14[2] L☉ |
| Surface gravity (log g) | 3.79[6] cgs |
| Temperature | 7,199[2] K |
| Metallicity [Fe/H] | 0.27[5] dex |
| Rotational velocity (v sin i) | 85[8][9] km/s |
| Age | 2.19[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Together with ι Trianguli and 10 Trianguli, it forms part of the obsolete Triangulum Minus.
References edit
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c d e f g h Reiners, Ansgar; Zechmeister, Mathias (2020). "Radial velocity photon limits for the dwarf stars of spectral classes F--M". The Astrophysical Journal Supplement Series. 247 (1): 11. arXiv:1912.04120. Bibcode:2020ApJS..247...11R. doi:10.3847/1538-4365/ab609f.
- ^ a b Kervella, Pierre; Arenou, Frédéric; Mignard, François; Thévenin, Frédéric (March 2019). "Stellar and substellar companions of nearby stars from Gaia DR2 - Binarity from proper motion anomaly". Astronomy and Astrophysics. 623: 623. arXiv:1811.08902. Bibcode:2019A&A...623A..72K. doi:10.1051/0004-6361/201834371.
- ^ a b Cruzalèbes, P.; et al. (2019). "A catalogue of stellar diameters and fluxes for mid-infrared interferometry". Monthly Notices of the Royal Astronomical Society. 490 (3): 3158–3176. arXiv:1910.00542. Bibcode:2019MNRAS.490.3158C. doi:10.1093/mnras/stz2803.
- ^ a b c Netopil, Martin (2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv:1705.00883. Bibcode:2017MNRAS.469.3042N. doi:10.1093/mnras/stx1077.
- ^ a b c d e f g h 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.
- ^ a b Brandt, Timothy D. (2021). "The Hipparcos-Gaia Catalog of Accelerations: Gaia EDR3 Edition". The Astrophysical Journal Supplement Series. 254 (2): 42. arXiv:2105.11662. Bibcode:2021ApJS..254...42B. doi:10.3847/1538-4365/abf93c.
- ^ van Belle, G.T. (2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review. 20 (1): 51. arXiv:1204.2572. Bibcode:2012A&ARv..20...51V. doi:10.1007/s00159-012-0051-2.
- ^ de Bruijne, J.H.J.; Eilers, A.-C. (2012). "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project". Astronomy & Astrophysics. 546: 14. arXiv:1208.3048. Bibcode:2012A&A...546A..61D. doi:10.1051/0004-6361/201219219.
- ^ 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