Astronomy:49 Aquarii

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Short description: Star in the constellation Aquarius
49 Aquarii
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius
Right ascension  22h 23m 30.84904s[1]
Declination −24° 45′ 45.5865″[1]
Apparent magnitude (V) 5.53[2]
Characteristics
Spectral type K0 III CN II[3]
B−V color index 0.979±0.003[2]
Astrometry
Radial velocity (Rv)−12.97±0.07[4] km/s
Proper motion (μ) RA: +98.380[1] mas/yr
Dec.: −2.909[1] mas/yr
Parallax (π)12.2800 ± 0.0965[1] mas
Distance266 ± 2 ly
(81.4 ± 0.6 pc)
Absolute magnitude (MV)1.01[2]
Details[4]
Mass2.18±0.14 M☉
Radius9.10±0.51 R☉
Luminosity50.1+11.6
−9.4 L☉
Surface gravity (log g)2.85±0.09 cgs
Temperature4,954±24 K
Metallicity [Fe/H]+0.05±0.03 dex
Rotational velocity (v sin i)1.42±0.45 km/s
Age950±210 Myr
Other designations
CD−25° 15905, HD 212271, HIP 110529, HR 8529, SAO 191105[5]
Database references
SIMBADdata

49 Aquarii, abbreviated 49 Aqr, is a star in the zodiac constellation of Aquarius. 49 Aquarii is its Flamsteed designation. It is a dim star with an apparent visual magnitude of 5.53.[2] The distance to 49 Aqr, as determined from its annual parallax shift of 12.28 mas,[1] is 266 light years. It is moving closer to the Earth with a heliocentric radial velocity of −13 km/s.[4]

This is an aging K-type giant star with a stellar classification of K0 III CN II.[3] It shows a spectral anomaly with the absorption lines of cyanogen (CN). This is a red clump giant, indicating that it is generating energy through the helium fusion at its core.[6] It is around 950 million years old with 2.2 times the mass of the Sun and has expanded to nine times the Sun's radius. It is radiating 50 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,954 K.[4]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. 
  2. ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1988mcts.book.....H. 
  4. ↑ 4.0 4.1 4.2 4.3 Jofré, E. et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics 574: A50, doi:10.1051/0004-6361/201424474, Bibcode: 2015A&A...574A..50J. 
  5. ↑ "49 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=49+Aqr. 
  6. ↑ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal 539 (2): 732–741, doi:10.1086/309278, Bibcode: 2000ApJ...539..732A. 



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