58 Andromedae

58 Andromedae, abbreviated 58 And, is a single[9] star in the northern constellation Andromeda. 58 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 4.78[2] The distance to this star, as determined from its annual parallax shift of 9.9 mas,[1] is 330 light years. 58 And is moving further from the Earth with a heliocentric radial velocity of +8 km/s.[2] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.159″ per year.[10]

58 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  02h 08m 29.25999s[1]
Declination +37° 51′ 32.6861″[1]
Apparent magnitude (V) 4.78[2]
Characteristics
Spectral type A5 IV-V[3]
B−V color index 0.120±0.003[2]
Astrometry
Radial velocity (Rv)7.60±1.78[2] km/s
Proper motion (μ) RA: +183.659[1] mas/yr
Dec.: +11.670[1] mas/yr
Parallax (π)9.8863 ± 0.1292[1] mas
Distance330 ± 4 ly
(101 ± 1 pc)
Absolute magnitude (MV)0.94[2]
Details[4]
Mass2.00 M☉
Radius1.9[5] R☉
Luminosity35.55[2] L☉
Surface gravity (log g)3.89±0.14 cgs
Temperature8,875±302 K
Metallicity [Fe/H]−0.98[6] dex
Rotational velocity (v sin i)135[7] km/s
Age425 Myr
Other designations
58 And, BD+37° 486, HD 13041, HIP 9977, HR 620, SAO 55289[8]
Database references
SIMBADdata

This star is 425 million years old with a stellar classification of A5 IV-V,[3] indicating the spectrum displays mixed traits of an A-type main-sequence star and an older subgiant star. It is spinning rapidly with a projected rotational velocity of 135 km/s, which is giving the star an oblate shape with an equatorial bulge that is 6% larger than the polar radius.[7] The star has double[4] the mass of the Sun and about 1.9[5] times the Sun's radius. It is radiating 36[2] times the Sun's luminosity from its photosphere at an effective temperature of 8,875 K.[4]

References
  1. 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. 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.
  3. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  4. 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.
  5. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  6. Gebran, M.; et al. (2016), "A new method for the inversion of atmospheric parameters of A/Am stars", Astronomy & Astrophysics, 589: A83, arXiv:1603.01146, Bibcode:2016A&A...589A..83G, doi:10.1051/0004-6361/201528052.
  7. van Belle, Gerard T. (March 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.
  8. "58 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 2, 2018.
  9. De Rosa, R. J.; et al. (2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216–1240, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932.
  10. 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.
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