41 Aquarii

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41 Aquarii
Observation data
Epoch J2000       Equinox J2000
Constellation Aquarius
Right ascension 22h 14m 18.03271s [1]
Declination −21° 04′ 28.4330″ [1]
Apparent magnitude  (V)5.354 [2]
Characteristics
Spectral type K0 III + F8 V [3]
U−B color index +0.465 [2]
B−V color index +0.834 [2]
Astrometry
41 Aqr A
Radial velocity (Rv)−24.94±0.13 [4] km/s
Proper motion (μ)RA: +24.827 [4] mas/yr
Dec.: +54.923 [4] mas/yr
Parallax (π)13.7811±0.1850  mas [4]
Distance 237 ± 3  ly
(72.6 ± 1.0  pc)
Proper motion (μ)RA: +27.266 [5]   mas/yr
Dec.: +57.272 [5]   mas/yr
Parallax (π)13.5404 ± 0.0719  mas [5]
Distance 241 ± 1  ly
(73.9 ± 0.4  pc)
Details
41 Aqr A
Radius 7.88+0.09
−0.13 [4]   R☉
Luminosity 33.93±0.53 [4]   L☉
Surface gravity (log g)2.85 [6]   cgs
Temperature 4,750 [6]   K
Metallicity [Fe/H]−0.13 [6]   dex
41 Aqr B
Radius 1.76+0.29
−0.06 [5]   R☉
Luminosity6.319±0.043 [5]   L☉
Temperature 6,899+115
−506 [5]   K
Other designations
41 Aqr, BD−21°6180, HD 210960, HIP 109786, HR 8480, SAO 190986, WDS J22143-2104 [7]
Database references
SIMBAD data

41 Aquarii is a double star [3] in the equatorial constellation of Aquarius. 41 Aquarii is its Flamsteed designation. It is visible to the naked eye as a dim, orange-hued point of light with a combined apparent visual magnitude of 5.354. [2] The pair are located at a distance of around 239 light-years (73 parsecs ) from the Sun based on parallax, but are drifting closer with a radial velocity of –25 km/s. [4]

The brighter component of the pair is a red clump [8] giant star with a stellar classification of K0 III [3] and a magnitude of 5.73. This is an aging star that has exhausted the supply of hydrogen at its core and is now generating energy through core helium fusion. It has eight [4] times the girth of the Sun and is radiating 34 [4] times the luminosity of the Sun at an effective temperature of 4,750 K. [6]

At an angular separation of 5.148  arcseconds, the fainter companion is an F-type main sequence star with a magnitude 7.16 and a classification of F8 V. [3] It has 1.8 [5] times the Sun's radius and is radiating six [5] times the Sun's luminosity from its photosphere at 6,899 K. [5]

References

  1. 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.
  2. 1 2 3 4 Rakos, K. D.; et al. (February 1982), "Photometric and astrometric observations of close visual binaries", Astronomy and Astrophysics Supplement Series, 47: 221–235, Bibcode:1982A&AS...47..221R.
  3. 1 2 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, arXiv: 0806.2878 , Bibcode:2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x , S2CID   14878976.
  4. 1 2 3 4 5 6 7 8 9 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.
  5. 1 2 3 4 5 6 7 8 9 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.
  6. 1 2 3 4 McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527.
  7. ↑ "41 Aqr -- Star in double system", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg , retrieved 2012-02-23.
  8. ↑ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv: astro-ph/0003329 , Bibcode:2000ApJ...539..732A, doi:10.1086/309278, S2CID   16673121.
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