HD 82741
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 09h 35m 03.83005s[1] |
| Declination | +39° 37′ 17.3743″[1] |
| Apparent magnitude (V) | 4.81[2] |
| Characteristics | |
| Spectral type | G9.5 IIIb Fe-1[3] |
| B−V color index | 0.980[4] |
| Astrometry | |
| Radial velocity (Rv) | 0.992±0.002[2] km/s |
| Proper motion (μ) | RA: −30.124[1] mas/yr Dec.: +20.155[1] mas/yr |
| Parallax (π) | 14.6281 ± 0.2230 mas[1] |
| Distance | 223 ± 3 ly (68 ± 1 pc) |
| Absolute magnitude (MV) | 0.573[4] |
| Details | |
| Mass | 1.62[5] M☉ |
| Radius | 11[6] R☉ |
| Luminosity | 58.9[5] L☉ |
| Surface gravity (log g) | 2.6[6] cgs |
| Temperature | 4,809±51[5] K |
| Metallicity [Fe/H] | −0.18[4] dex |
| Rotational velocity (v sin i) | 1.0[6] km/s |
| Age | 2.74[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 82741 is a single[8] star in the northern constellation of Lynx. It is visible to the naked eye with an apparent visual magnitude of 4.81.[2] The distance to HD 82741 is 223 light years, as determined from its annual parallax shift of 14.6 mas.[1] It is moving further from the Earth with a heliocentric radial velocity of 1 km/s.[2]
At the age of 2.74[5] billion years, this is an evolved giant star with a stellar classification of G9.5 IIIb Fe-1,[3] where the suffix notation indicates an underabundance of iron in its atmosphere. It belongs to a sub-category of giants called the red clump, indicating that it is on the horizontal branch and is generating energy through the fusion of helium at its core.[9] With 1.62[5] times the mass of the Sun, it has expanded to 11[6] times the Sun's radius. It is radiating 58.9[5] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,809 K.[5]
References[edit]
- ^ a b c d e f 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.
- ^ a b c d Anderson, 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, S2CID 119257644.
- ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
- ^ a b c Soubiran, C.; et al. (2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788, S2CID 16602121.
- ^ a b c d e f g h Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
- ^ a b c d Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
- ^ "HD 82741". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-01.
- ^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ 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.
