Kappa Leporis

Kappa Leporis, Latinized from κ Leporis, is a binary star[10] system in the southern constellation of Lepus. The pair have apparent visual magnitudes of 4.43 and 7.00, with the former being bright enough to be seen with the naked eye. As of 2000, they had an angular separation of 2.179 arc seconds along a position angle of 357.3°. Based upon an annual parallax shift of 4.48 mas as measured from Earth,[1] the system is located roughly 730 light years from the Sun. The system is travelling away from the Sun with a radial velocity of +20.8 km/s.[5]

Kappa Leporis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lepus
Right ascension  05h 13m 13.87761s[1]
Declination −12° 56′ 28.6463″[1]
Apparent magnitude (V) 4.43 + 7.00[2]
Characteristics
Spectral type B9 V[3]
U−B color index −0.34[4]
B−V color index −0.10[4]
Astrometry
Radial velocity (Rv)+20.8±1.0[5] km/s
Proper motion (μ) RA: −12.29[1] mas/yr
Dec.: −0.79[1] mas/yr
Parallax (π)4.48 ± 0.58[1] mas
Distanceapprox. 730 ly
(approx. 220 pc)
Absolute magnitude (MV)−2.34[6]
Details[3]
κ Lep A
Mass4.86±0.39 M☉
Radius2.6[7] R☉
Luminosity1,346 L☉
Surface gravity (log g)3.44[8] cgs
Temperature11,588 K
Metallicity [Fe/H]−0.07[8] dex
Rotational velocity (v sin i)135 km/s
Other designations
κ Lep, 4 Lep, BD−13° 1092, GC 6387, HD 33949, HIP 24327, HR 1705, SAO 150239, CCDM J05132-1256AB[9]
Database references
SIMBADdata

The brighter, blue-white hued member of the system, component A, is a B-type main-sequence star with a stellar classification of B9 V.[3] It has nearly five[3] times the mass of the Sun and around 2.6[7] times the Sun's radius. The star is radiating 1,346 times the Sun's luminosity from its photosphere at an effective temperature of 11,588 K.[3] It displays an infrared excess at a wavelength of 12μm, making it a candidate host for a circumstellar debris disk.[11]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Fabricius, C.; Makarov, V. V. (April 2000), "Two-colour photometry for 9473 components of close Hipparcos double and multiple stars", Astronomy and Astrophysics, 356: 141–145, Bibcode:2000A&A...356..141F.
  3. Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  4. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  6. 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.
  7. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. Saffe, C.; Gómez, M.; Pintado, O.; González, E. (October 2008), "Spectroscopic metallicities of Vega-like stars", Astronomy and Astrophysics, 490 (1): 297–305, arXiv:0805.3936, Bibcode:2008A&A...490..297S, doi:10.1051/0004-6361:200810260.
  9. "kap Lep". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-18.
  10. 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.
  11. Mannings, Vincent; et al. (1998), "Candidate Main-Sequence Stars with Debris Disks: A New Sample of Vega-like Sources", The Astrophysical Journal, 497: 330–341, Bibcode:1998ApJ...497..330M, CiteSeerX 10.1.1.502.7594, doi:10.1086/305432.
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