AK Leporis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lepus |
| Right ascension | 05h 44m 26.543s[1] |
| Declination | −22° 25′ 18.77″[1] |
| Apparent magnitude (V) | 6.141[2] |
| Characteristics | |
| Spectral type | K2V[3] |
| U−B color index | +0.74[4] |
| B−V color index | +0.96[4] |
| Variable type | BY Draconis[3] |
| Astrometry | |
| Radial velocity (Rv) | −9.57 ± 0.13[5] km/s |
| Proper motion (μ) | RA: −304.4[6] mas/yr Dec.: −352.2[6] mas/yr |
| Parallax (π) | 112.0 mas[7] |
| Distance | 28 ly (9.0[8] pc) |
| Absolute magnitude (MV) | 6.31[2] |
| Details | |
| Surface gravity (log g) | 4.66 ± 0.01[9] cgs |
| Temperature | 4,869 ± 61[9] K |
| Metallicity [Fe/H] | 0.01 ± 0.06[9] dex |
| Rotational velocity (v sin i) | 2.8 ± 1.8[5] km/s |
| Age | 0.9[8] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
AK Leporis is a star in the southern constellation of Lepus the hare. It has an apparent visual magnitude of 6.141,[2] so, according to the Bortle scale, it is faintly visible from rural skies at night. This star forms a visual double with Gamma Leporis—the two have an angular separation of 97″, making them difficult to separate with the naked eye even under the best conditions.[11] Both Gamma Leporis and AK Leporis are members of the Ursa Major Moving Group of stars that share a common motion through space.[5]
This is a BY Draconis variable star that undergoes brightness variations due to stellar activity. Differential rotation causes changes to the periodicity of the variation depending on the latitude of the activity.[3] X-ray emission has been detected from AK Leporis, and it is located at or near a radio source.[7]
Infrared observation of this star shows a large excess at a wavelength of 24 µm. This may be explained by the proximity of Gamma Leporis to the line of sight, or there may be a red dwarf companion or a dust disc. There is no excess observed at 70 µm.[8]
References
- ^ a b Roeser, S.; Bastian, U. (September 1988), "A new star catalogue of SAO type", Astronomy and Astrophysics Supplement Series, 74 (3): 449–451, Bibcode:1988A&AS...74..449R.
- ^ a b c Nordström, Andersen; et al. (2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14000 F and G dwarfs", Publications of the Astronomical Society of Australia, 21 (2): 129–133, Bibcode:2004PASA...21..129N, doi:10.1071/AS04013.
- ^ a b c Lecavelier Des Etangs, A.; et al. (August 2005), "A photometric survey of stars with circumstellar material", Astronomy and Astrophysics, 439 (2): 571–574, Bibcode:2005A&A...439..571L, doi:10.1051/0004-6361:20042401.
- ^ a b Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
- ^ a b c Biazzo, K.; et al. (December 2012), "Elemental abundances of low-mass stars in nearby young associations: AB Doradus, Carina Near and Ursa Major", Monthly Notices of the Royal Astronomical Society, 427 (4): 2905–2916, arXiv:1209.2591, Bibcode:2012MNRAS.427.2905B, doi:10.1111/j.1365-2966.2012.22132.x.
{{citation}}: CS1 maint: unflagged free DOI (link) - ^ a b Høg, E.; et al. (March 2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27–L30, Bibcode:2000A&A...355L..27H, doi:10.1888/0333750888/2862.
- ^ a b Lazio, T. Joseph W.; et al. (January 2010), "A Blind Search for Magnetospheric Emissions from Planetary Companions to Nearby Solar-Type Stars", The Astronomical Journal, 139 (1): 96–101, arXiv:0910.3938, Bibcode:2010AJ....139...96L, doi:10.1088/0004-6256/139/1/96.
- ^ a b c Lawler, S. M.; et al. (November 2009), "Explorations Beyond the Snow Line: Spitzer/IRS Spectra of Debris Disks Around Solar-type Stars", The Astrophysical Journal, 705 (1): 89–111, arXiv:0909.0058, Bibcode:2009ApJ...705...89L, doi:10.1088/0004-637X/705/1/89.
- ^ a b c Prugniel, Ph.; et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769.
- ^ "V* AK Lep". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-04-02.
{{cite web}}: CS1 maint: postscript (link) - ^ Kaler, James B., "Gamma Leporis", Stars, University of Illinois, retrieved 2015-04-02.
