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κ Mensae
Location of κ Mensae (circled)
Observation data
Epoch J2000       Equinox J2000
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  mas/ yr [1]
Dec.: +66.518  mas/ yr [1]
Parallax (π)11.018 ± 0.0604  mas [1]
Distance296 ± 2  ly
(90.8 ± 0.5  pc)
Absolute magnitude (MV)+0.78 [7]
Details
Mass3.44 [8]  M☉
Radius1.95±0.09 [9]  R☉
Luminosity66.4+2.6
−2.5 [3]  L☉
Surface gravity (log g)4.21 [8]  cgs
Temperature10,965±50 [3]  K
Metallicity [Fe/H]0.00 [10]  dex
Rotational velocity (v sin i)290 [11] km/s
Age115 [8]  Myr
Other designations
κ Mensae, 32 G. Mensae, CPD−79° 202, HD 40953, HIP 27566, HR 2125, SAO 256248 [12] [13]
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. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv: 2012.01533. Bibcode: 2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657. S2CID  227254300. (Erratum:  doi: 10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode: 2000A&A...355L..27H. ISSN  0004-6361.
  3. ^ a b c d e f Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv: 1201.2052. Bibcode: 2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691. ISSN  0004-6361. S2CID  55586789.
  4. ^ a b 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. ^ a b 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. ^ a b Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". International Astronomical Union. 30: 57. Bibcode: 1967IAUS...30...57E.
  7. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. ISSN  1063-7737. S2CID  119257644.
  8. ^ a b c d e 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. arXiv: 1501.03154. Bibcode: 2015ApJ...804..146D. doi: 10.1088/0004-637X/804/2/146. ISSN  1538-4357.
  9. ^ a b 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. arXiv: astro-ph/9911002. Bibcode: 1999A&A...352..555A. ISSN  0004-6361.
  10. ^ Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv: 1606.08814. Bibcode: 2012AstL...38..771G. doi: 10.1134/S1063773712120031. ISSN  0320-0108. S2CID  255201789.
  11. ^ a b 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.
  12. ^ "kap Men". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 15, 2022.
  13. ^ 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.
  14. ^ 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. arXiv: 0806.2878. Bibcode: 2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x. eISSN  1365-2966. ISSN  0035-8711.
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