94 Aquarii

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94 Aquarii
Observation data
Epoch J2000       Equinox J2000
Constellation Aquarius
94 Aquarii A (Aa/Ab)
Right ascension 23h 19m 06.7257s [1]
Declination −13° 27′ 31.615″ [1]
Apparent magnitude  (V)5.19 [2]
94 Aquarii B
Right ascension 23h 19m 06.5609s [3]
Declination −13° 27′ 18.904″ [3]
Apparent magnitude  (V)7.52 [2]
Characteristics
94 Aqr A
Spectral type G8.5 IV [4] + K V [5]
U−B color index +0.42 [2]
B−V color index +0.79 [2]
94 Aqr B
Spectral type K2 V [4]
U−B color index +0.60 [2]
B−V color index +0.88 [2]
Astrometry
94 Aquarii A (Aa/Ab)
Radial velocity (Rv)+17.60±0.07 [6] km/s
Proper motion (μ)RA: 258.738±0.944 [1] mas/yr
Dec.: −73.014±0.928 [1] mas/yr
Parallax (π)44.8996±0.5572  mas [1]
Distance 72.6 ± 0.9  ly
(22.3 ± 0.3  pc)
Absolute magnitude  (MV)+3.52/+6.52 [7]
94 Aquarii B
Proper motion (μ)RA: 306.702±0.107 [3] mas/yr
Dec.: −104.633±0.086 [3] mas/yr
Parallax (π)44.5152±0.0550  mas [3]
Distance 73.27 ± 0.09  ly
(22.46 ± 0.03  pc)
Absolute magnitude  (MV)+5.92 [7]
Orbit [7]
Primary94 Aquarii Aa
Companion94 Aquarii Ab
Period (P)6.321±0.010  yr
Semi-major axis (a)0.189±0.002″
Eccentricity (e)0.173±0.020
Inclination (i)44.5±1.0°
Longitude of the node (Ω)341.9±1.5°
Periastron epoch (T)2012.301
Argument of periastron (ω)
(secondary)		28.3°
Details
94 Aquarii Aa
Mass 1.22±0.03 [8]   M☉
Radius 2.06±0.03 [8]   R☉
Luminosity 3.30±0.06 [8]   L☉
Surface gravity (log g)3.88 [9]   cgs
Temperature 5,461 [9]   K
Metallicity [Fe/H]+0.23 [9]   dex
Rotational velocity (v sin i)8 [10]  km/s
Age 6.2±0.2 [8]   Gyr
94 Aquarii Ab
Mass 0.81±0.04 [8]   M☉
Radius 0.85±0.03 [8]   R☉
Temperature 4,670 or 4,970 [5]   K
94 Aquarii B
Surface gravity (log g)4.54 [5]   cgs
Temperature 5,136 [5]   K
Metallicity [Fe/H]+0.24 [5]   dex
Other designations
BD−14 6448, GJ 894.2, HD 219834, HIP 115126, HR 8866, SAO 165625 [11]
Database references
SIMBAD data

94 Aquarii (abbreviated 94 Aqr) is a triple star [12] system in the equatorial constellation of Aquarius. 94 Aquarii is the Flamsteed designation. The brightest member has an apparent visual magnitude of 5.19, [2] making it visible to the naked eye. The parallax measured by the Gaia spacecraft yields a distance estimate of around 73 light-years (22 parsecs ) from Earth. [1]

The inner pair of this triple star system form a spectroscopic binary with an orbital period of 6.321 years, a moderate orbital eccentricity of 0.173, [7] and a combined visual magnitude of 5.19. [13] The primary component of this pair has a stellar classification of G8.5 IV, [9] with the luminosity class of IV indicating this is a subgiant star. At an angular separation of 13.0  arcseconds from this pair is a magnitude 7.52 [13] K-type main sequence star with a classification of K2 V. [4]

References

  1. 1 2 3 4 5 6 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 . Gaia DR2 record for this source at VizieR.
  2. 1 2 3 4 5 6 7 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 4 5 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 . Gaia DR2 record for this source at VizieR.
  4. 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.
  5. 1 2 3 4 5 Fuhrmann, Klaus (February 2008). "Nearby stars of the Galactic disc and halo - IV". Monthly Notices of the Royal Astronomical Society . 384 (1): 173–224. Bibcode:2008MNRAS.384..173F. doi: 10.1111/j.1365-2966.2007.12671.x .
  6. ↑ Katoh, Noriyuki; et al. (2013). "Determination of Orbital Elements of Spectroscopic Binaries Using High-dispersion Spectroscopy". The Astronomical Journal. 145 (2). 41. Bibcode: 2013AJ....145...41K . doi: 10.1088/0004-6256/145/2/41 .
  7. 1 2 3 4 Docobo, José A.; et al. (2018). "Visual Orbit and Individual Masses of the Single-lined Spectroscopic Binary 94 AQR A (HD 219834A; MCA 74)". The Astronomical Journal. 156 (3). 85. Bibcode: 2018AJ....156...85D . doi: 10.3847/1538-3881/aad179 .
  8. 1 2 3 4 5 6 Metcalfe, Travis S.; van Saders, Jennifer L.; Basu, Sarbani; Buzasi, Derek; Chaplin, William J.; Egeland, Ricky; Garcia, Rafael A.; Gaulme, Patrick; Huber, Daniel; Reinhold, Timo; Schunker, Hannah; Stassun, Keivan G.; Appourchaux, Thierry; Ball, Warrick H.; Bedding, Timothy R.; Deheuvels, Sébastien; González-Cuesta, Lucía; Handberg, Rasmus; Jiménez, Antonio; Kjeldsen, Hans; Li, Tanda; Lund, Mikkel N.; Mathur, Savita; Mosser, Benoit; Nielsen, Martin B.; Noll, Anthony; Çelik Orhan, Zeynep; Örtel, Sibel; Santos, Ângela R. G.; Yildiz, Mutlu; Baliunas, Sallie; Soon, Willie (11 September 2020). "The Evolution of Rotation and Magnetic Activity in 94 Aqr Aa from Asteroseismology with TESS". The Astrophysical Journal. 900 (2): 154. arXiv: 2007.12755 . Bibcode:2020ApJ...900..154M. doi: 10.3847/1538-4357/aba963 .
  9. 1 2 3 4 Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I", The Astronomical Journal, 132 (1): 161–170, arXiv: astro-ph/0603770 , Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID   119476992.
  10. ↑ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B.
  11. ↑ "* 94 Aqr". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2012-07-17.
  12. ↑ Sarma, M. B. K. (January 1962), "The Orbit of the Spectroscopic Binary 94 Aquarii", Astrophysical Journal, 135: 301, Bibcode:1962ApJ...135..301S, doi:10.1086/147268.
  13. 1 2 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.
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