Astronomy:Kappa Mensae
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Short description: Star in the constellation of Mensa
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Mensa |
| Right ascension | 05h 50m 16.7857s[1] |
| Declination | −79° 21′ 40.900″[1] |
| Apparent magnitude (V) | 5.45 ± 0.01[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B9 V[4] |
| U−B color index | −0.24[5] |
| B−V color index | −0.08[5] |
| Astrometry | |
| Radial velocity (Rv) | 9.5 ± 2[6] km/s |
| Proper motion (μ) | RA: −4.815[1] mas/yr Dec.: +66.518[1] mas/yr |
| Parallax (π) | 11.018 ± 0.0604[1] mas |
| Distance | 296 ± 2 ly (90.8 ± 0.5 pc) |
| Absolute magnitude (MV) | +0.78[7] |
| Details | |
| Mass | 3.44[8] M☉ |
| Radius | 1.95±0.09[9] R☉ |
| Luminosity | 66.4+2.6 −2.5[3] L☉ |
| Surface gravity (log g) | 4.21[8] cgs |
| Temperature | 10,965±50[3] K |
| Metallicity [Fe/H] | 0.00[10] dex |
| Rotational velocity (v sin i) | 290[11] km/s |
| Age | 115[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kappa Mensae, Latinized from κ Mensae, is a solitary[14] star in the southern circumpolar constellation Mensa. Its distance of 296 light years[1] based on its parallax shift gives it an apparent magnitude of 5.45,[2] making it faintly visible to the naked eye. However, it is receding from the Sun with a heliocentric radial velocity of 9.5 km/s.[6]
Kappa Mensae has a stellar classification of B9 V,[4] indicating that it is an ordinary B-type main-sequence star. At present it has 3.44 times the mass of the Sun[8] and a diameter of 1.95 R☉.[9] It radiates at 66[3] times the luminosity from its photosphere at an effective temperature of 10,965 K,[3] giving it a bluish white hue. The star is very young, aged 115 million years,[8] having completed only 33.7% of its main sequence lifetime.[3] Kappa Mensae has a high rate of spin, rotating with a projected rotational velocity of 290 km/s.[11]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. Bibcode: 2012A&A...537A.120Z.
- ↑ 4.0 4.1 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0.. Bibcode: 1975mcts.book.....H.
- ↑ 5.0 5.1 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J.
- ↑ 6.0 6.1 Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". International Astronomical Union 30: 57. Bibcode: 1967IAUS...30...57E.
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 8.0 8.1 8.2 8.3 8.4 David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-Type Stars: StrÖmgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal 804 (2): 146. doi:10.1088/0004-637X/804/2/146. ISSN 1538-4357. Bibcode: 2015ApJ...804..146D.
- ↑ 9.0 9.1 Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. ISSN 0004-6361. Bibcode: 1999A&A...352..555A.
- ↑ Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. ISSN 0320-0108. Bibcode: 2012AstL...38..771G.
- ↑ 11.0 11.1 Levato, H.; Grosso, M. (June 2004). "New Projected Rotational Velocities of All Southern B-type Stars of the Bright Star Catalogue". Astronomical Society of the Pacific 215: 51. Bibcode: 2004IAUS..215...51L.
- ↑ "kap Men". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=kap+Men.
- ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino 1. Bibcode: 1879RNAO....1.....G.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (11 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. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E.
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