49 Aquarii
| Observation data EpochJ2000EquinoxJ2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h23m30.84904s[1] |
| Declination | −24° 45′ 45.5865″[1] |
| Apparent magnitude(V) | 5.53[2] |
| Characteristics | |
| Spectral type | K0 III CN II[3] |
| B−Vcolor 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 ± 0.0965mas[1] |
| Distance | 266 ± 2ly (81.4 ± 0.6pc) |
| Absolute magnitude(MV) | 1.01[2] |
| Details[4] | |
| Mass | 2.18±0.14M☉ |
| Radius | 9.10±0.51R☉ |
| Luminosity | 50.1+11.6 −9.4L☉ |
| Surface gravity(logg) | 2.85±0.09cgs |
| Temperature | 4,954±24K |
| Metallicity[Fe/H] | +0.05±0.03dex |
| Rotational velocity(vsini) | 1.42±0.45km/s |
| Age | 950±210Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
49 Aquarii,abbreviated49 Aqr,is astarin thezodiacconstellationofAquarius.49 Aquariiis itsFlamsteed designation.It is a dim star with anapparent visual magnitudeof 5.53.[2]The distance to 49 Aqr, as determined from its annualparallax shiftof12.28mas,[1]is 266light years.It is moving closer to the Earth with a heliocentricradial velocityof −13 km/s.[4]
This is an agingK-typegiant starwith astellar classificationofK0 III CN II.[3]It shows aspectralanomaly with theabsorption linesof cyanogen (CN). This is ared clumpgiant, indicating that it is generating energy through thehelium fusionat its core.[6]It is around 950 million years old with 2.2 times themass of the Sunand has expanded to nine times theSun's radius.It is radiating 50 times theSun's luminosityfrom its enlargedphotosphereat aneffective temperatureof 4,954 K.[4]
References
[edit]- ^abcdefBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData 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.
- ^abcdAnderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation",Astronomy Letters,38(5): 331,arXiv:1108.4971,Bibcode:2012AstL...38..331A,doi:10.1134/S1063773712050015,S2CID119257644.
- ^abHouk, Nancy; Smith-Moore, M. (1978),Michigan catalogue of two-dimensional spectral types for the HD stars,vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan,Bibcode:1988mcts.book.....H.
- ^abcdJofré, E.; et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets",Astronomy & Astrophysics,574:A50,arXiv:1410.6422,Bibcode:2015A&A...574A..50J,doi:10.1051/0004-6361/201424474,S2CID53666931.
- ^"49 Aqr".SIMBAD.Centre de données astronomiques de Strasbourg.RetrievedOctober 23,2018.
- ^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,S2CID16673121.
