89 Aquarii

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89 Aquarii
Aquarius IAU.svg
Cercle rouge 100%25.svg
Location of 89 Aquarii (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Aquarius
Right ascension 23h 09m 54.89736s [1]
Declination −22° 27′ 27.4192″ [1]
Apparent magnitude  (V)+4.69 [2]
Characteristics
Spectral type G3 II + A2 V [3]
U−B color index +0.39 [2]
B−V color index +0.65 [2]
Astrometry
Radial velocity (Rv)−4.8 [4] km/s
Proper motion (μ)RA: +32.61 [1] mas/yr
Dec.: −9.76 [1] mas/yr
Parallax (π)6.47±0.68  mas [1]
Distance approx. 500  ly
(approx. 150  pc)
Absolute magnitude  (MV)0.1/1.5 [5]
Details
89 Aqr A
Mass 2.9 [5]   M☉
Surface gravity (log g)3.62 [6]   cgs
Temperature 5,640 [6]   K
Metallicity [Fe/H]+0.27 [6]   dex
Age 320 [5]   Myr
89 Aqr B
Mass 2.0 [5]   M☉
Temperature 8,912 [5]   K
Other designations
CD−23 17771, HIP 114375, HR 8817, SAO 191687. [7]
89 Aqr A: HD  218640.
89 Aqr B: HD 218641.
Database references
SIMBAD data

89 Aquarii (abbreviated 89 Aqr) is a binary star [3] system in the equatorial constellation of Aquarius. 89 Aquarii is the Flamsteed designation, though it also bears the Bayer designation c3 Aquarii. [8] The apparent visual magnitude of +4.69 [2] is bright enough to be seen with the naked eye. Its distance from Earth is roughly 500 light-years (150 pc), based upon parallax measurements with an 11% margin of error. [1]

The primary component of this system has a magnitude of 5.27 and a stellar classification of G3 II, which suggests this is an evolved star in the bright giant stage. The companion is an A-type main sequence star with a stellar classification of A2 V. [3] As of 2010, it is located at an angular separation of 0.1843  arcseconds along a position angle of 135.1°. [9] They orbit each other with an estimated period of 201 years and a semimajor axis of 0.45 arcseconds. [5]

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752 , Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID   18759600.
  2. 1 2 3 4 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.
  3. 1 2 3 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.
  4. ↑ 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.
  5. 1 2 3 4 5 6 Parsons, Sidney B. (May 2004), "New and Confirmed Triple Systems with Luminous Cool Primaries and Hot Companions", The Astronomical Journal, 127 (5): 2915–2930, Bibcode:2004AJ....127.2915P, doi: 10.1086/383546 .
  6. 1 2 3 McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi: 10.1086/191527 .
  7. ↑ "* 89 Aqr". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2012-07-13.
  8. ↑ database record, HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index, N. D. Kostjuk, Institute of Astronomy of Russian Academy of Sciences, 2002; CDS ID IV/27A.
  9. ↑ Tokovinin, A.; et al. (December 2010), "High-Resolution Imaging at the SOAR Telescope", Publications of the Astronomical Society of the Pacific, 122 (898): 1483–1494, arXiv: 1010.4176 , Bibcode:2010PASP..122.1483T, doi:10.1086/657903, S2CID   26826524.
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