Xi Mensae

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Xi Mensae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Mensa
Right ascension 04h 58m 50.96791s[1]
Declination −82° 28′ 13.8521″[1]
Apparent magnitude (V) 5.84[2]
Characteristics
Spectral type G8/K0III[3]
B−V color index 0.932±0.006[2]
Astrometry
Radial velocity (Rv)−4.7±0.2[1] km/s
Proper motion (μ) RA: −4.701±0.091[1] mas/yr
Dec.: +2.648±0.107[1] mas/yr
Parallax (π)9.6939 ± 0.0535 mas[1]
Distance336 ± 2 ly
(103.2 ± 0.6 pc)
Absolute magnitude (MV)0.57[2]
Details
Mass1.91[4] M☉
Radius8.97+0.22
−0.55[1] R☉
Luminosity50.3±0.4[1] L☉
Surface gravity (log g)3.02[5] cgs
Temperature5,131+166
−60[1] K
Metallicity [Fe/H]0.06[5] dex
Age281[4] Myr
Other designations
ξ Men, CPD−82° 106, FK5 917, HD 34172, HIP 23148, HR 1716, SAO 258395[6]
Database references
SIMBADdata

ξ Mensae, Latinized as Xi Mensae, is a single[7] star in the southern circumpolar constellation of Mensa. It has a yellow-orange hue and is just barely visible to the naked eye as a dim point of light with an apparent visual magnitude of 5.84.[2] This object is located about 366 light years away from the Sun based on parallax, but is drifting closer with a radial velocity of −5 km/s.[1]

This object is an aging giant star with a stellar classification of G8/K0III.[3] It is 281[4] million years old with 1.91[4] times the mass of the Sun. The star displays micro-variability, fluctuating in brightness by 0.0049 magnitudes with a period of 148 days.[8] With the supply of hydrogen at its core exhausted, the star has cooled and expanded to nine[1] times the Sun's radius. It is radiating 50 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 5,131 K.[1]

References

  1. ^ a b c d e f g h i j k l 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. Gaia DR2 record for this source at VizieR.
  2. ^ 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 255204555.
  3. ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
  4. ^ a b c d Luck, 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. ^ a b Alves, 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.
  6. ^ "ksi Men". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 May 2018.
  7. ^ 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.
  8. ^ Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x, S2CID 10505995.
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