59 Andromedae

59 Andromedae, abbreviated 59 And, is a sixth-magnitude binary star system in the northern constellation of Andromeda. 59 Andromedae is the Flamsteed designation. As of 2017, the pair had an angular separation of 16.60″ along a position angle (PA) of 36°. Compare this to a separation of 15.3″ along a PA of 35°, as measured in 1783.[11] The two stars have an estimated physical separation of 1,370 AU.[5]

59 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
59 And A
Right ascension 02h 10m 52.82451s[1]
Declination +39° 02′ 22.3597″[1]
Apparent magnitude (V) 6.09[2]
59 And B
Right ascension 02h 10m 53.65687s[1]
Declination +39° 02′ 35.9164″[1]
Apparent magnitude (V) 6.82[2]
Characteristics
59 And A
Spectral type B9 V[3]
B−V color index −0.054±0.006[2]
59 And B
Spectral type A1 Vn[3]
B−V color index +0.081±0.005[2]
Astrometry
59 And A
Radial velocity (Rv)−1.00±3.4[4] km/s
Proper motion (μ) RA: −13.506[1] mas/yr
Dec.: −14.981[1] mas/yr
Parallax (π)7.1469 ± 0.1007[1] mas
Distance456 ± 6 ly
(140 ± 2 pc)
59 And B
Radial velocity (Rv)6.0±4.6[4] km/s
Proper motion (μ) RA: −9.166[1] mas/yr
Dec.: −17.208[1] mas/yr
Parallax (π)7.4166 ± 0.0619[1] mas
Distance440 ± 4 ly
(135 ± 1 pc)
Details
59 And A
Radius2.73[5] R☉
Luminosity83.97[6] L☉
Temperature10,870[6] K
Rotational velocity (v sin i)176[3] km/s
59 And B
Mass2.23±0.09[7] M☉
Radius2.59[5] R☉
Luminosity30.4+7.6
−6.1[7] L☉
Temperature9,498[6] K
Rotational velocity (v sin i)233[3] km/s
Other designations
59 And, BD+38° 425, ADS 1683, WDS J02109+3902[8]
59 And A: GC 2600, HD 13294, HIP 10176, HR 628, SAO 55330[9]
59 And B: GC 2602, HD 13295, HIP 10180, HR 629, SAO 55331[10]
Database references
SIMBADdata
SIMBADdata

The magnitude 6.09[2] primary component is a B-type main-sequence star with a stellar classification of B9 V.[3] It has 2.73[5] times the Sun's radius and is radiating 84 times the Sun's luminosity from its photosphere at an effective temperature of 10,870 K.[6] It is spinning with a projected rotational velocity of 176 km/s.[3]

The secondary is a magnitude 6.82[2] A-type main-sequence star with a class of A1 Vn,[3] where the 'n' suffix indicates "nebulous" lines due to rapid rotation. It is spinning with a high projected rotational velocity of 233 km/s.[3] The star has 2.23[7] times the Sun's mass and 2.59[5] times the Sun's radius. It is radiating 30[7] times the luminosity of the Sun and has an effective temperature of 9,498 K.[6]

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, S2CID 119257644.
  3. Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298
  4. 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. Howe, K. S.; Clarke, C. J. (January 2009), "An analysis of v sin (i) correlations in early-type binaries", Monthly Notices of the Royal Astronomical Society, 392 (1): 448–454, Bibcode:2009MNRAS.392..448H, doi:10.1111/j.1365-2966.2008.14073.x.
  6. McDonald, I.; Zijlstra, A. A.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  7. 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, A120.
  8. "59 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 3, 2018.
  9. "59 And A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 3, 2018.
  10. "59 And B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 3, 2018.
  11. Mason, B. D.; et al. (December 2001), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
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