12 Andromedae

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12 Andromedae
Pegasus constellation map.svg
Red circle.svg
Location of 12 Andromedae (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Andromeda
Right ascension 23h 20m 53.26361s [1]
Declination +38° 10′ 56.3671″ [1]
Apparent magnitude  (V)5.87 [2]
Characteristics
Spectral type F5 V [2] [3]
B−V color index 0.45 [4]
Astrometry
Radial velocity (Rv)−10.5±0.3 [5] km/s
Proper motion (μ)RA: 130.117(34) [1] mas/yr
Dec.: −58.960(33) [1] mas/yr
Parallax (π)23.7806±0.0361  mas [1]
Distance 137.2 ± 0.2  ly
(42.05 ± 0.06  pc)
Absolute magnitude  (MV)2.66 [3]
Details
Mass 1.25 [6]   M☉
Luminosity 7.38 [3]   L☉
Surface gravity (log g)3.92±0.14 [6]   cgs
Temperature 6,454±219 [6]   K
Metallicity [Fe/H]+0.00 [7]   dex
Rotational velocity (v sin i)12 [4]  km/s
Age 2.548 [6]   Gyr
Other designations
12 And, BD+37°4817, FK5 1610, HD 220117, HIP 115280, HR 8885, SAO 73190, PPM 88745, WDS J23209+3811A [8]
Database references
SIMBAD data

12 Andromedae is a single [2] star in the northern constellation of Andromeda. The designation is from the star catalogue of English astronomer John Flamsteed, first published in 1712. It has an apparent visual magnitude of 5.87, [2] which indicates it is just visible to the naked eye under good seeing conditions. An annual parallax shift of 23.7806 [1]   mas provides a distance estimate of 137  light years. The star is moving closer to the Sun with a radial velocity of −10.5 km/s. [5]

This is an ordinary F-type main-sequence star with a stellar classification of F5 V. [2] It is about 2.5 [6]  billion years old and is spinning with a projected rotational velocity of 12 km/s. [4] The abundance of iron is similar to that in the Sun. [7] The star has an estimated 1.25 [6] times the mass of the Sun and is radiating just over 7 [3] times the Sun's luminosity from its photosphere at an effective temperature of around 6,454 K. [6]

References

  1. 1 2 3 4 5 6 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. 1 2 3 4 5 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.
  3. 1 2 3 4 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.
  4. 1 2 3 Takeda, Yoichi; et al. (February 2005), "High-Dispersion Spectra Collection of Nearby F-K Stars at Okayama Astrophysical Observatory: A Basis for Spectroscopic Abundance Standards", Publications of the Astronomical Society of Japan, 57 (1): 13–25, Bibcode:2005PASJ...57...13T, doi:10.1093/pasj/57.1.13.
  5. 1 2 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv: 1606.08053 , Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID   119231169.
  6. 1 2 3 4 5 6 7 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv: 1501.03154 , Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID   33401607.
  7. 1 2 Takeda, Yoichi (April 2007), "Fundamental Parameters and Elemental Abundances of 160 F-G-K Stars Based on OAO Spectrum Database", Publications of the Astronomical Society of Japan, 59 (2): 335–356, Bibcode:2007PASJ...59..335T, doi: 10.1093/pasj/59.2.335 .
  8. ↑ "12 And". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-02-01.
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