Astronomy:89 Aquarii

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Short description: Binary star in the constellation Aquarius
89 Aquarii
Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings
Cercle rouge 100%.svg
Location of 89 Aquarii (circled)
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas
Distanceapprox. 500 ly
(approx. 150 pc)
Absolute magnitude (MV)0.1/1.5[5]
Details
89 Aqr A
Mass2.9[5] M☉
Surface gravity (log g)3.62[6] cgs
Temperature5,640[6] K
Metallicity [Fe/H]+0.27[6] dex
Age320[5] Myr
89 Aqr B
Mass2.0[5] M☉
Temperature8,912[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
SIMBADdata

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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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. 
  2. ↑ 2.0 2.1 2.2 2.3 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. ↑ 3.0 3.1 3.2 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. ↑ 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. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Parsons, Sidney B. (May 2004), "New and Confirmed Triple Systems with Luminous Cool Primaries and Hot Companions", The Astronomical Journal 127 (5): 2915–2930, doi:10.1086/383546, Bibcode: 2004AJ....127.2915P. 
  6. ↑ 6.0 6.1 6.2 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, doi:10.1086/191527, Bibcode: 1990ApJS...74.1075M. 
  7. ↑ "* 89 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+89+Aqr. 
  8. ↑ [1] 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, doi:10.1086/657903, Bibcode: 2010PASP..122.1483T. 

External links



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