11 Trianguli

11 Trianguli is a solitary[12] star located in the northern constellation Triangulum, with an apparent magnitude of 5.55. The star is situated 281 light years[1] away but is approaching with a heliocentric radial velocity of −41.614 km/s.[6] It is probably on the horizontal branch fusing helium in its core,[3] and is calculated to be about 6.3 Gyr old.[3] It has a stellar classification of K1 III.[4][5] It has 2.446 times the mass of the Sun and 12.055 times the radius of the Sun.[8] It shines at 54.6 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 4,572 K.[10]

11 Trianguli
Location of 11 Trianguli (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Triangulum
Right ascension 02h 27m 27.771s[1]
Declination +31° 48′ 04.61″[1]
Apparent magnitude (V) 5.55[2]
Characteristics
Evolutionary stage horizontal branch[3]
Spectral type K1 III[4][5]
B−V color index +1.1[2]
Astrometry
Radial velocity (Rv)−41.614±0.163[6] km/s
Proper motion (μ) RA: −24.331[1] mas/yr
Dec.: −27.845[1] mas/yr
Parallax (π)11.6240 ± 0.1293 mas[1]
Distance281 ± 3 ly
(86.0 ± 1.0 pc)
Absolute magnitude (MV)0.836[7]
Details
Mass2.446±0.122[8] M☉
Radius12.055±0.603[8] R☉
Luminosity54.6±3.8[9] L☉
Surface gravity (log g)2.2[10] cgs
Temperature4,572[10] K
Metallicity [Fe/H]−0.19[7][11] dex
Age6.3+2.8
−1.4[3] Gyr
Other designations
11 Trianguli, AG+31° 231, BD+31°427, GC 2943, HD 15176, HIP 11432, HR 712, SAO 55570
Database references
SIMBADdata

References
  1. 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.
  2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.
  3. Stock, Stephan; et al. (August 2018), "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search", Astronomy & Astrophysics, 616: 15, arXiv:1805.04094, Bibcode:2018A&A...616A..33S, doi:10.1051/0004-6361/201833111, S2CID 119361866, A33.
  4. Hinkel, Natalie R.; Unterborn, Cayman; Kane, Stephen R.; Somers, Garrett; Galvez, Richard (2019). "A Recommendation Algorithm to Predict Giant Exoplanet Host Stars Using Stellar Elemental Abundances". The Astrophysical Journal. 880 (1): 49. arXiv:1805.12144. Bibcode:2019ApJ...880...49H. doi:10.3847/1538-4357/ab27c0.
  5. 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.
  6. 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.
  7. Soubiran, C.; Bienayme, O.; Mishenina, T.V. (2008). "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants". A&A. 480 (1): 91–101. arXiv:0712.1370. Bibcode:2008A&A...480...91S. doi:10.1051/0004-6361:20078788.
  8. 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". A&A. 623. arXiv:1811.08902. Bibcode:2019A&A...623A..72K. doi:10.1051/0004-6361/201834371.
  9. Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity". A&A. 574. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360.
  10. Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". A&A. 591: A118. arXiv:1605.07384. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497.
  11. Massarotti, Alessandro; Latham, D.W.; Stefanik, R.P.; Fogel, Jeffrey (2008). "Rotational and radial velocities for a sample of 761 Hipparcos giants and the role of binarity". The Astronomical Journal. 135 (1): 209. Bibcode:2008AJ....135..209M. doi:10.1051/0004-6361:20078788.
  12. 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.
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