Astronomy:Eta Mensae
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Short description: Star in the constellation Mensa
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Mensa |
| Right ascension | 04h 55m 11.20309s[1] |
| Declination | −74° 56′ 12.6705″[1] |
| Apparent magnitude (V) | 5.47[2] |
| Characteristics | |
| Spectral type | K4 III[3][4] |
| U−B color index | +1.82[2] |
| B−V color index | +1.52[2] |
| Astrometry | |
| Proper motion (μ) | RA: +28.27[1] mas/yr Dec.: +61.52[1] mas/yr |
| Parallax (π) | 5.0299 ± 0.0998[5] mas |
| Distance | 650 ± 10 ly (199 ± 4 pc) |
| Absolute magnitude (MV) | −1.08[6] |
| Details | |
| Luminosity | 616[7] L☉ |
| Surface gravity (log g) | 1.15[8] cgs |
| Temperature | 4,055[7] K |
| Metallicity [Fe/H] | −0.17[8] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
Eta Mensae, Latinized from η Mensae, is the Bayer designation for a solitary,[4] orange-hued star in the southern constellation of Mensa. This object has an apparent visual magnitude of 5.47,[2] which is sufficiently luminous to be faintly visible to the naked eye. Based upon an annual parallax shift of 4.88 mas as seen from Earth,[1] this star is located roughly 670 light years from the Sun.
This is an evolved K-type giant star with a stellar classification of K4 III.[3] It is radiating 616 times the Sun's luminosity from its photosphere at an effective temperature of 4,055 K.[7] The star displays an infrared excess that suggests the presence of circumstellar dust.[10][11] Eta Mensae is a probable member of the stream of stars associated with the Hyades cluster.[12]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Johnson, 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.
- ↑ 3.0 3.1 Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ↑ 4.0 4.1 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 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.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ 8.0 8.1 Soubiran, C. et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics 515: A111, doi:10.1051/0004-6361/201014247, Bibcode: 2010A&A...515A.111S.
- ↑ "eta Men". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=eta+Men.
- ↑ Kim, Sungsoo S. et al. (April 2001), "Extent of Excess Far-Infrared Emission around Luminosity Class III Stars", The Astrophysical Journal 550 (2): 1000–1006, doi:10.1086/319803, Bibcode: 2001ApJ...550.1000K.
- ↑ Zuckerman, B. et al. (June 1995), "Luminosity Class III Stars with Excess Far-Infrared Emission", Astrophysical Journal Letters 446: L79, doi:10.1086/187935, Bibcode: 1995ApJ...446L..79Z.
- ↑ Eggen, Olin J. (1996), "The Stellar Content of Star Stream I", Astronomical Journal 111: 1615, doi:10.1086/117901, Bibcode: 1996AJ....111.1615E.
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