Xi Mensae
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]
| 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[1] mas |
| Distance | 336 ± 2 ly (103.2 ± 0.6 pc) |
| Absolute magnitude (MV) | 0.57[2] |
| Details | |
| Mass | 1.91[4] M☉ |
| Radius | 8.97+0.22 −0.55[1] R☉ |
| Luminosity | 50.3±0.4[1] L☉ |
| Surface gravity (log g) | 3.02[5] cgs |
| Temperature | 5,131+166 −60[1] K |
| Metallicity [Fe/H] | 0.06[5] dex |
| Age | 281[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- 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.
- 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.
- Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
- 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, 88.
- 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.
- "ksi Men". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 May 2018.
- 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.
- Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331: 45, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x.