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Gamma Mensae, Latinized from γ Mensae, is an orange-hued star system in the southern constellation of Mensa. The apparent visual magnitude of 5.19[2] indicates it is dimly visible to the naked eye. Based upon an annual parallax shift of 7.70 mas as seen from the Earth,[1] it is about 102 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.033 due to interstellar dust.[9] The system shows the high velocity kinematic properties of a population II star, but has Sun-like abundances of most elements.[11]

γ Mensae
Location of γ Mensae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Mensa
Right ascension 05h 31m 53.01393s[1]
Declination −76° 20′ 27.4779″[1]
Apparent magnitude (V) 5.19[2]
Characteristics
Spectral type K2 III[3][4]
U−B color index +1.18[2]
B−V color index +1.13[2]
Astrometry
Radial velocity (Rv)+56.7±0.8[5] km/s
Proper motion (μ) RA: +140.646[6] mas/yr
Dec.: +269.634[6] mas/yr
Parallax (π)31.1021 ± 0.1519 mas[6]
Distance104.9 ± 0.5 ly
(32.2 ± 0.2 pc)
Absolute magnitude (MV)+2.70[7]
Orbit[8]
Period (P)7.455±4.857 yr
Semi-major axis (a)51±10″
Eccentricity (e)0.59±0.15
Inclination (i)53±8°
Longitude of the node (Ω)117±90°
Periastron epoch (T)1995.111±4.085
Argument of periastron (ω)
(secondary)		124±74°
Details[9]
γ Men A
Mass1.04 M☉
Radius4.99 R☉
Luminosity21 L☉
Surface gravity (log g)2.76[3] cgs
Temperature4,491[3] K
Metallicity [Fe/H]+0.22 dex
Age10.60 Gyr
Other designations
γ Men, CD−76° 222, HD 37763, HIP 25918, HR 1953, SAO 256201[10]
Database references
SIMBADdata

This is a probable astrometric binary system[4] with poorly constrained orbital elements. The visible member, component A, is an evolved K-type giant star with a stellar classification K2 III[3] At about 10.6 billion years of age, it has nearly the same mass as the Sun but has expanded to five times the Sun's radius.[9] The star shines with 21 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,491 K.[3]


References


  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
  4. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  6. 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.
  7. 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.
  8. Hartkopf, W. I.; et al. (June 30, 2006), Sixth Catalog of Orbits of Visual Binary Stars, United States Naval Observatory, retrieved 2017-06-02.
  9. Wittenmyer, Robert A.; Liu, Fan; Wang, Liang; Casagrande, Luca; Johnson, John Asher; Tinney, C. G. (July 2016), "The Pan-Pacific Planet Search. V. Fundamental Parameters for 164 Evolved Stars", The Astronomical Journal, 152 (1): 15, arXiv:1605.00323, Bibcode:2016AJ....152...19W, doi:10.3847/0004-6256/152/1/19, S2CID 55991800, 19.
  10. "gam Men". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-16.{{cite web}}: CS1 maint: postscript (link)
  11. Foy, R. (May 1980), "Detailed analysis of high velocity stars", Astronomy and Astrophysics, 85 (3): 287–294, Bibcode:1980A&A....85..287F.

На других языках

[de] Gamma Mensae

γ Mensae (Gamma Mensae; kurz γ Men) ist mit einer scheinbaren Helligkeit von 5,19m[2] der zweithellste Stern des am Südhimmel gelegenen Sternbilds Tafelberg. Dennoch ist der Stern so lichtschwach, dass er für das bloße Auge gerade noch wahrnehmbar ist. Nach im Dezember 2020 veröffentlichten Auswertungen der Messergebnisse der Raumsonde Gaia beträgt seine Distanz zur Erde etwa 107 Lichtjahre.[1] Seine scheinbare Helligkeit wird durch die vom interstellaren Staub hervorgerufene Extinktion um etwa 0,03m geschwächt.[5]
- [en] Gamma Mensae


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