Astronomy:51 Aquarii

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Short description: Binary star system in the constellation Aquarius
51 Aquarii
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius[1]
Right ascension  22h 24m 06.88433s[2]
Declination −04° 50′ 13.2692″[2]
Apparent magnitude (V) 5.78 (6.45 + 6.63)[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type A0 V[5] + A0[3]
U−B color index −0.11[6]
B−V color index −0.04[6]
Astrometry
Radial velocity (Rv)+6[7] km/s
Proper motion (μ) RA: +26.90[2] mas/yr
Dec.: −7.35[2] mas/yr
Parallax (π)8.04 ± 0.63[2] mas
Distance410 ± 30 ly
(124 ± 10 pc)
Absolute magnitude (MV)+0.33[1]
Orbit[8]
Period (P)145.07±1.85 yr
Semi-major axis (a)0.402±0.003″
Eccentricity (e)0.702±0.003
Inclination (i)161.4±0.7°
Longitude of the node (Ω)113.5±3.0°
Periastron epoch (T)1987.66±0.05
Argument of periastron (ω)
(secondary)		296.9±3.0°
Details
51 Aqr A
Mass2.80±0.10[4] M☉
Luminosity88.2+14.8
−14.2[4] L☉
Temperature10,328±71[4] K
Rotational velocity (v sin i)91[4] km/s
Other designations
51 Aqr, BD−05°5780, HD 212404, HIP 110578, HR 8533, SAO 146067, WDS J22241-0450[9]
Database references
SIMBADdata

51 Aquarii is a binary star[3] system located around 410[2] light years away from the Sun in the equatorial constellation of Aquarius. 51 Aquarii is its Flamsteed designation. It is visible to the naked eye as a dim, yellow-white hued star with a combined apparent visual magnitude of 5.78.[6] The system is moving further from the Earth with a heliocentric radial velocity of +6 km/s.[7]

The dual nature of this system was discovered by S. W. Burnham in 1873 with a 6 inches (15 cm) Alvan Clark refractor.[10] The pair orbit each other with a period of 145 years and a large eccentricity of 0.7.[8] The magnitude 6.45[3] primary, designated component A, is an A-type main sequence star with a stellar classification of A0 V.[5] It has a high rate of rotation with a projected rotational velocity of 91 km/s.[11] The secondary component has a matching class of A0 with a visual magnitude of 6.63.[3] It has an effective temperature of 10,238 K.

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Zorec, J.; Royer, F.; Asplund, Martin; Cassisi, Santi; Ramirez, Ivan; Melendez, Jorge; Bensby, Thomas; Feltzing, Sofia (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z. 
  5. ↑ 5.0 5.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C. 
  6. ↑ 6.0 6.1 6.2 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode: 1978A&AS...34....1N. 
  7. ↑ 7.0 7.1 Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Carnegie Institute of Washington, D.C.), Bibcode: 1953GCRV..C......0W. 
  8. ↑ 8.0 8.1 Tokovinin, Andrei; Mason, Brian D.; Hartkopf, William I.; Mendez, Rene A.; Horch, Elliott P. (2015), "Speckle Interferometry at Soar in 2014", The Astronomical Journal 150 (2): 50, doi:10.1088/0004-6256/150/2/50, Bibcode: 2015AJ....150...50T. 
  9. ↑ "* 51 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+51+Aqr. 
  10. ↑ Docobo, J. A.; Ling, J. F. (April 2007), "Orbits and System Masses of 14 Visual Double Stars with Early-Type Components", The Astronomical Journal 133 (4): 1209–1216, doi:10.1086/511070, Bibcode: 2007AJ....133.1209D 
  11. ↑ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R. 



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