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]
| 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 mas[1] |
| Distance | approx. 730 ly (approx. 220 pc) |
| Absolute magnitude (MV) | −2.34[6] |
| Details[3] | |
| κ Lep A | |
| Mass | 4.86±0.39 M☉ |
| Radius | 2.6[7] R☉ |
| Luminosity | 1,346 L☉ |
| Surface gravity (log g) | 3.44[8] cgs |
| Temperature | 11,588 K |
| Metallicity [Fe/H] | −0.07[8] dex |
| Rotational velocity (v sin i) | 135 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 edit
- ^ a b c d e f 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, S2CID 18759600.
- ^ 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.
- ^ a b c d e 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, S2CID 55586789.
- ^ a b 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.
- ^ a b 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, S2CID 59451347, A61.
- ^ 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, S2CID 119257644.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b 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, S2CID 15059920.
- ^ "kap Lep". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-18.
{{cite web}}: CS1 maint: postscript (link) - ^ 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, S2CID 14878976.
- ^ Mannings, Vincent; et al. (1998), "Candidate Main-Sequence Stars with Debris Disks: A New Sample of Vega-like Sources", The Astrophysical Journal, 497 (1): 330–341, Bibcode:1998ApJ...497..330M, CiteSeerX 10.1.1.502.7594, doi:10.1086/305432, S2CID 122421281.