HD 82741

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]

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[1] mas
Distance223 ± 3 ly
(68 ± 1 pc)
Absolute magnitude (MV)0.573[4]
Details
Mass1.62[5] M☉
Radius11[6] R☉
Luminosity58.9[5] L☉
Surface gravity (log g)2.6[6] cgs
Temperature4,809±51[5] K
Metallicity [Fe/H]−0.18[4] dex
Rotational velocity (v sin i)1.0[6] km/s
Age2.74[5] Gyr
Other designations
BD+40° 2224, FK5 2762, HD 82741, HIP 47029, HR 3809, SAO 61578[7]
Database references
SIMBADdata

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
  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. "HD 82741". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-01.
  8. 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.
  9. 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.
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