97 Aquarii

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97 Aquarii
Observation data
Epoch J2000       Equinox J2000
Constellation Aquarius
Right ascension 23h 22m 39.17113s [1]
Declination −15° 02 21.6245 [1]
Apparent magnitude  (V)5.20 [2] (5.59/6.72) [3]
Characteristics
Spectral type A2 V + A7 V [4]
U−B color index +0.10 [2]
B−V color index +0.20 [2]
Astrometry
Radial velocity (Rv)−12 [5] km/s
Proper motion (μ)RA: +117.00 [1] mas/yr
Dec.: +16.48 [1] mas/yr
Parallax (π)15.30±0.79  mas [1]
Distance 210 ± 10  ly
(65 ± 3  pc)
Orbit [6]
Period (P)64.62 yr
Semi-major axis (a)0.408″
Eccentricity (e)0.140
Inclination (i)77.6°
Longitude of the node (Ω)276.3°
Periastron epoch (T)1941.29
Argument of periastron (ω)
(secondary)
354.6°
Details
Rotational velocity (v sin i)175 [7]  km/s
Other designations
BD−15°6406, HD 220278, HIP 115404, HR  8890, SAO 165658. [8]
Database references
SIMBAD data

97 Aquarii (abbreviated 97 Aqr) is a binary star system in the equatorial constellation of Aquarius. 97 Aquarii is the Flamsteed designation. The combined apparent visual magnitude of the system is 5.20; [2] the brighter star is magnitude 5.59 while the companion is magnitude 6.72. [3] Based upon an annual parallax shift of 15.30  milliarcseconds, [1] this system is at a distance of around 210 light-years (64 parsecs ) from Earth.

The two stars in this system orbit each other over a period of 64.62 years at an eccentricity of 0.14. [3] Both are A-type main sequence stars; the primary has a stellar classification of A2 V while its companion is A7 V. [4] Their composite spectrum shows the properties of a Lambda Boötis star, which means it displays peculiar abundances of certain elements. [9]

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. 1 2 Christy, James W.; Walker, R. L. Jr. (October 1969), "MK Classification of 142 Visual Binaries", Publications of the Astronomical Society of the Pacific, 81 (482): 643, Bibcode:1969PASP...81..643C, doi: 10.1086/128831
  5. Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Washington: Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W.
  6. Anonymous (1999), "New orbits", International Astronomical Union Commission 26 (Double Stars), 139 (Information Circular No. 139): 1–2, Bibcode:1999IAUDS.139....1.
  7. 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, arXiv: astro-ph/0610785 , Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID   18475298.
  8. "* 97 Aqr". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2012-07-17.
  9. Gerbaldi, M.; Faraggiana, R.; Lai, O. (December 2003), "The heterogeneous class of lambda Bootis stars", Astronomy and Astrophysics, 412 (2): 447–464, Bibcode:2003A&A...412..447G, doi: 10.1051/0004-6361:20031472 .