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Beta Mensae

From Wikipedia, the free encyclopedia
Star in the constellation Mensa
β Mensae
Location of β Mensae (circled)
Observation data
EpochJ2000.0      EquinoxJ2000.0 (ICRS)
ConstellationMensa
Right ascension05h 02m 42.99847s[1]
Declination−71° 18′ 51.4765″[1]
Apparent magnitude (V)5.31[2]
Characteristics
Spectral typeG8 III[3]
U−Bcolor index+0.77[2]
B−Vcolor index+1.00[2]
Astrometry
Radial velocity (Rv)−11.40[4] km/s
Proper motion (μ)RA: −4.368[1]mas/yr
Dec.: +10.815[1]mas/yr
Parallax (π)4.9368±0.0810 mas[1]
Distance660 ± 10 ly
(203 ± 3 pc)
Absolute magnitude (MV)−1.62[5]
Details
Mass3.58[4] M
Radius25.85+0.69
−0.62
[1] R
Luminosity345±7[1] L
Surface gravity (log g)2.54±0.11[6] cgs
Temperature5,088±44[6] K
Metallicity [Fe/H]+0.00±0.04[6] dex
Age270[4] Myr
Other designations
β Men,CPD−71° 309,FK5 2380,GC 6232,HD 33285,HIP 23467,HR 1677,SAO 256154,PPM 368632[7]
Database references
SIMBADdata

Beta Mensae,Latinized from β Mensae, is the third-brighteststar in theconstellation ofMensa. Despite this, it is only faintly visible to the naked eye, appearing as a dim, yellow-hued point of light with anapparent visual magnitude of 5.31.[2] The star is positioned near the southwest edge of theLarge Magellanic Cloud, but it does not form part of this much more distantsatellite galaxy. Based upon an annualparallax shift of just 4.11 mas as seen from the Earth,[8] the star is located at a distance of roughly 790 light years from theSun. It is moving closer with a heliocentricradial velocity of −11 km/s.[4]

This is a solitary,[9]G-typegiant star with astellar classification of G8 III.[3] It is around 270 million years old with 3.6 times themass of the Sun.[4] Having exhausted the supply of hydrogen at itscore, it has expanded to 26[1] times theSun's radius. Beta Mensae is radiating 513[4] times theSun's luminosity from itsphotosphere at aneffective temperature of about 5,088 K.[6]

References

[edit]
  1. ^abcdefghBrown, 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. Gaia DR2 record for this source atVizieR.
  2. ^abcdJohnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars",Communications of the Lunar and Planetary Laboratory,4 (99): 99,Bibcode:1966CoLPL...4...99J.
  3. ^abHouk, Nancy; Cowley, A. P. (1979),Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan,Bibcode:1978mcts.book.....H.
  4. ^abcdefLuck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants",The Astronomical Journal,150 (3): 23,arXiv:1507.01466,Bibcode:2015AJ....150...88L,doi:10.1088/0004-6256/150/3/88,S2CID 118505114, 88.
  5. ^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.
  6. ^abcdAlves, S.; et al. (April 2015), "Determination of the spectroscopic stellar parameters for 257 field giant stars",Monthly Notices of the Royal Astronomical Society,448 (3):2749–2765,arXiv:1503.02556,Bibcode:2015MNRAS.448.2749A,doi:10.1093/mnras/stv189.
  7. ^"bet Men".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2017-08-16.{{cite web}}: CS1 maint: postscript (link)
  8. ^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.
  9. ^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.
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