13 Andromedae

13 Andromedae, abbreviated 13 And, is a single,[9] blue-white hued variable star[4] in the northern constellation of Andromeda. 13 Andromedae is the Flamsteed designation, while it bears the variable star designation V388 Andromedae. With a typical apparent visual magnitude of around 5.75,[2] it is dimly visible to the naked eye under good seeing conditions. The distance to this star can be directly estimated from its annual parallax shift of 10.9 mas,[1] yielding a range of 300 light years. At that distance, its brightness is diminished by an extinction of 0.13 magnitude due to interstellar dust.[6] The star is moving closer to the Earth with a heliocentric radial velocity of −8 km/s.[5]

13 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  23h 27m 07.40s[1]
Declination +42° 54′ 43.2″[1]
Apparent magnitude (V) 5.75[2]
Spectral type B9 III or B9 Mn[3]
B−V color index −0.007±0.004[2]
Variable type α2 CVn[4]
Radial velocity (Rv)−8.1±1.6[5] km/s
Proper motion (μ) RA: 87.05[1] mas/yr
Dec.: 16.54[1] mas/yr
Parallax (π)10.87 ± 0.30[1] mas
Distance300 ± 8 ly
(92 ± 3 pc)
Absolute magnitude (MV)0.98[6]
Luminosity42.89[2] L
Rotational velocity (v sin i)75[7] km/s
Age345[6] Myr
Other designations
13 And, V388 Andromedae, BD+42° 4672, HD 220885, HIP 115755, HR 8913, SAO 53039[8]
Database references

This is a magnetic chemically peculiar star that has been assigned stellar classifications of B9 III or B9 Mn.[3] It is a variable star of the Alpha2 Canum Venaticorum type, ranging in magnitude from 5.73 down to 5.77[4] with a period of 1.47946 days.[3] The star has a high rate of spin, showing a projected rotational velocity of 75 km/s.[7] 13 Andromedae is around 345[6] million years old and shines with 43[2] times the Sun's luminosity.


  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 d e 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. ^ a b c Adelman, Saul J. (May 2005), "uvby FCAPT Photometry of the Magnetic Chemically Peculiar Stars 36 Aurigae, HR 2722, 13 Andromedae, and HD 220147", The Publications of the Astronomical Society of the Pacific, 117 (831): 476–482, Bibcode:2005PASP..117..476A, doi:10.1086/429640.
  4. ^ a b c Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085.
  5. ^ a b Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  6. ^ a b c d Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035.
  7. ^ a b Abt, Helmut A.; et al. (2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573: 359, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
  8. ^ "13 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 19, 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.

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