Astronomy:HD 82741
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lynx[1] |
| Right ascension | 09h 35m 03.83005s[2] |
| Declination | +39° 37′ 17.3743″[2] |
| Apparent magnitude (V) | 4.81[1] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | G9.5 IIIb Fe-1[4] |
| B−V color index | 0.980[5] |
| Astrometry | |
| Radial velocity (Rv) | 0.992±0.002[1] km/s |
| Proper motion (μ) | RA: −30.124[2] mas/yr Dec.: +20.155[2] mas/yr |
| Parallax (π) | 14.6281 ± 0.2230[2] mas |
| Distance | 223 ± 3 ly (68 ± 1 pc) |
| Absolute magnitude (MV) | 0.573[5] |
| Details | |
| Mass | 1.62[6] M☉ |
| Radius | 8.78±0.61[7] R☉ |
| Luminosity | 58.9[6] L☉ |
| Surface gravity (log g) | 2.6[8] cgs |
| Temperature | 4,809±51[6] K |
| Metallicity [Fe/H] | −0.18[5] dex |
| Rotational velocity (v sin i) | 1.0[8] km/s |
| Age | 2.74[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 82741 is a single[10] star in the northern constellation of Lynx. It is visible to the naked eye with an apparent visual magnitude of 4.81.[1] The distance to HD 82741 is 223 light years, as determined from its annual parallax shift of 14.6 mas.[2] It is moving further from the Earth with a heliocentric radial velocity of 1 km/s.[1]
At the age of 2.74[6] billion years, this is an evolved giant star with a stellar classification of G9.5 IIIb Fe-1,[4] 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.[3] With 1.62 times the mass of the Sun,[6] it has expanded to 9 times the Sun's radius.[7] It is radiating 58.9 times the Sun's luminosity[6] from its enlarged photosphere at an effective temperature of 4,809 K.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ 5.0 5.1 5.2 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, doi:10.1051/0004-6361:20078788, Bibcode: 2008A&A...480...91S.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3), doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L.
- ↑ 7.0 7.1 Baines, Ellyn K.; Clark, James H.; Kingsley, Bradley I.; Schmitt, Henrique R.; Stone, Jordan M. (2025-05-07), "Vintage NPOI: New and Updated Angular Diameters for 145 Stars" (in en), The Astronomical Journal 169 (6): 293, doi:10.3847/1538-3881/adc930, ISSN 1538-3881, Bibcode: 2025AJ....169..293B.
- ↑ 8.0 8.1 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, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M.
- ↑ "HD 82741". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+82741.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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