 A visual band light curve for AK Leporis, adapted from Nitschelm et al. (2000) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lepus |
| Right ascension | 05 44 26.537 |
| Declination | −22° 25′ 18.61″ |
| Apparent magnitude (V) | 6.141 |
| Characteristics | |
| Spectral type | K2V |
| U−B color index | +0.74 |
| B−V color index | +0.96 |
| Variable type | BY Draconis |
| Astrometry | |
| Radial velocity (Rv) | 9.57±0.13 km/s |
| Proper motion (μ) | RA: −304.905 mas/yr Dec.: −352.606 mas/yr |
| Parallax (π) | 112.4661 ± 0.0151 mas |
| Distance | 29.000 ± 0.004 ly (8.892 ± 0.001 pc) |
| Absolute magnitude (MV) | 6.31 |
| Details | |
| Mass | 0.8 M☉ |
| Radius | 0.8 R☉ |
| Luminosity | 0.3 L☉ |
| Surface gravity (log g) | 4.66±0.01 cgs |
| Temperature | 4,869±61 K |
| Metallicity | 0.01±0.06 dex |
| Rotational velocity (v sin i) | 2.8±1.8 km/s |
| Age | 0.9 Gyr |
| Other designations | |
| BD−22 1210, GJ 216 B, HD 38392, HR 1982, LTT 2363, SAO 170757, γ Leporis B | |
| Database references | |
| SIMBAD | data |
AK Leporis is a variable star in the southern constellation of Lepus the hare. It has an apparent visual magnitude of 6.141, 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. Both Gamma Leporis and AK Leporis are members of the Ursa Major Moving Group of stars that share a common motion through space.
This is a BY Draconis variable star that undergoes slight brightness variations due to stellar activity. Differential rotation causes changes to the periodicity of the variation depending on the latitude of the activity. X-ray emission has been detected from AK Leporis, and it is located at or near a radio source.
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.
References
- ^ Nitschelm, C.; des Etangs, A. Lecavelier; Vidal-Madjar, A.; Ferlet, R.; Olsen, E. H.; Dennefeld, M. (August 2000), "A three-year Strömgren photometric survey of suspected β Pictoris-like stars", Astronomy and Astrophysics Supplement Series, 145 (2): 275–281, Bibcode:2000A&AS..145..275N, doi:10.1051/aas:2000243.
- ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ 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.
- ^ 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.
- ^ Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
- ^ 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, S2CID 118617986.
- ^ 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, S2CID 54940439.
- ^ 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, S2CID 1272803.
- "V* AK Lep", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2015-04-02.
- Kaler, James B., "Gamma Leporis", Stars, University of Illinois, retrieved 2015-04-02.
- 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, S2CID 118537554.
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