Astronomy:Kappa Leonis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h 24m 39.25874s[1] |
| Declination | +26° 10′ 56.3650″[1] |
| Apparent magnitude (V) | 4.460[2] |
| Characteristics | |
| Spectral type | K2 III[2] |
| U−B color index | +1.31[3] |
| B−V color index | +1.23[3] |
| Astrometry | |
| Radial velocity (Rv) | +27.94[4] km/s |
| Proper motion (μ) | RA: –31.64[1] mas/yr Dec.: –48.20[1] mas/yr |
| Parallax (π) | 16.20 ± 0.21[1] mas |
| Distance | 201 ± 3 ly (61.7 ± 0.8 pc) |
| Absolute magnitude (MV) | 0.66±0.028[5] |
| Details | |
| Mass | 1.44[2] M☉ |
| Radius | 17[6] R☉ |
| Luminosity | 89[2] L☉ |
| Surface gravity (log g) | 2.34[7] cgs |
| Temperature | 4,403±24[2] K |
| Metallicity [Fe/H] | +0.01[7] dex |
| Rotational velocity (v sin i) | 10[8] km/s |
| Age | 4.33[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kappa Leonis, Latinized from κ Leonis, is a double star in the constellation Leo.[9] It was called Al-minħar al-asad (Arabic: المنخر الأسد), meaning "the Lion's nose."[10] The name is corrupted to Al Minliar al Asad in the Yale Bright Star Catalogue.[11] This star is visible to the naked eye with an apparent visual magnitude of 4.46.[2] It has an annual parallax shift of 16.20 mas as seen from Earth, which provides a distance estimate of about 201 light years. Kappa Leonis is moving away from the Sun with a radial velocity of +28 km/s.[4]
The primary component is an evolved K-type giant star with a stellar classification of K2 III.[2] It is about the same age as the Sun with an estimated 144%[2] of the Sun's mass and has expanded to 17[6] times the Sun's girth. It is radiating 89[2] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,400 K.[2]
Kappa Leonis has a magnitude 10.4 companion at an angular separation of 2.1 arc seconds. The pair most likely form a binary star system.[12] The companion is a suspected variable star.[13]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". Astronomical Journal 150 (3): 88. doi:10.1088/0004-6256/150/3/88. Bibcode: 2015AJ....150...88L.
- ↑ 3.0 3.1 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "Ubvrijkl Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99. Bibcode: 1966CoLPL...4...99J.
- ↑ 4.0 4.1 Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data". Astronomy and Astrophysics 430: 165–186. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F.
- ↑ Park, Sunkyung et al. (2013). "Wilson-Bappu Effect: Extended to Surface Gravity". The Astronomical Journal 146 (4): 73. doi:10.1088/0004-6256/146/4/73. Bibcode: 2013AJ....146...73P.
- ↑ 6.0 6.1 Massarotti, Alessandro et al. (January 2008). "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity". The Astronomical Journal 135 (1): 209–231. doi:10.1088/0004-6256/135/1/209. Bibcode: 2008AJ....135..209M.
- ↑ 7.0 7.1 McWilliam, Andrew (1990). "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances". The Astrophysical Journal Supplement Series 74: 1075. doi:10.1086/191527. Bibcode: 1990ApJS...74.1075M.
- ↑ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities: I. Main sequence single stars. II. Main sequence spectroscopic binaries and eclipsing systems". Contrib. Os. Astrofis. Asiago 239: 1. Bibcode: 1970CoAsi.239....1B.
- ↑ 9.0 9.1 "* kap Leo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+kap+Leo.
- ↑ Allen, Richard Hinckley (1963). Star Names: Their Lore and Meaning (Revised ed.). New York: Dover Publications. pp. 67–72. ISBN 0-486-21079-0. https://archive.org/details/starnamestheirlo00alle/page/67.
- ↑ Hoffleit, D.; Warren Jr., W. H. (1991). "VizieR Correlated Data, HR 3731". Bright Star Catalogue, 5th Revised Ed. VizieR. http://vizier.u-strasbg.fr/viz-bin/VizieR?-6N&-out.form=H0&//*&-source%3DV/50/notes&HR%3D3731.
- ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1: B/gcvs. Bibcode: 2009yCat....102025S.
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