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    23 Andromedae

    From Wikipedia - Reading time: 5 min
    23 Andromedae
    Observation data
    Epoch J2000      Equinox J2000
    Constellation Andromeda
    Right ascension 00h 13m 30.83962s[1]
    Declination +41° 02′ 07.3315″[1]
    Apparent magnitude (V) 5.71[2]
    Characteristics
    Spectral type F0 IV[3]
    B−V color index +0.331±0.004[2]
    Astrometry
    Radial velocity (Rv)−27.1±1.2[4] km/s
    Proper motion (μ) RA: −123.289[1] mas/yr
    Dec.: −146.201[1] mas/yr
    Parallax (π)26.8161 ± 0.0858 mas[1]
    Distance121.6 ± 0.4 ly
    (37.3 ± 0.1 pc)
    Absolute magnitude (MV)+3.01[5]
    Details
    Mass1.43[6] M☉
    Luminosity49.9+5.5
    −4.9    [3] L☉
    Surface gravity (log g)4.25[6] cgs
    Temperature7,089±241[6] K
    Metallicity [Fe/H]−0.13±0.07[7] dex
    Rotational velocity (v sin i)36[3] km/s
    Age759[6] Myr
    Other designations
    23 And, BD+40° 29, FK5 2010, HD 905, HIP 1086, HR 41, SAO 36173[8]
    Database references
    SIMBADdata

    23 Andromedae, abbreviated 23 And, is a presumed single[9] star in the constellation Andromeda, although it has been a suspected spectroscopic binary.[10] 23 Andromedae is the Flamsteed designation. Its apparent visual magnitude is 5.71,[2] which indicates it is dimly visible to the naked eye under good viewing conditions. The distance to 23 And, as determined from its annual parallax shift of 26.8 mas,[1] is 121.6 light years. The star is moving further from the Earth with a heliocentric radial velocity of −27 km/s.[4] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.191″ per year.[11]

    The stellar classification of 23 And is F0 IV,[3] matching an F-type subgiant star that is in the process of evolving into a red giant. It displays a slight microvariability with a frequency of 0.85784 d−1 and an amplitude of 0.0062 magnitude.[12] The star is around 759[6] million years old with a projected rotational velocity of 36 km/s.[3] It has 1.43[6] times the mass of the Sun and is radiating 50[3] times the Sun's luminosity from its photosphere at an effective temperature of 7,089 K.[6]

    References[edit]

    1. ^ a b c d e f 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.
    2. ^ a b c 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.
    3. ^ a b c d e f Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
    4. ^ a b de Bruijne, J. H. J.; Eilers, A.-C. (October 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, S2CID 59451347, A61.
    5. ^ Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 1185775111
    6. ^ a b c d e f g 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. ^ Gáspár, András; et al. (August 2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal, 826 (2): 14, arXiv:1604.07403, Bibcode:2016ApJ...826..171G, doi:10.3847/0004-637X/826/2/171, S2CID 119241004, 171.
    8. ^ "23 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 21, 2018.
    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, S2CID 14878976.
    10. ^ Blanco, C.; et al. (November 1982), "Chromospheric MG II emission in A5 to K5 main sequence stars from high resolution IUE spectra", Astronomy and Astrophysics, 115 (2): 280–292, Bibcode:1982A&A...115..280B.
    11. ^ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
    12. ^ Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331: 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x, S2CID 10505995
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