Kappa Leonis
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]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas[1] |
| 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 |
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 Edit
- ^ a b c d e 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.
- ^ a b c d e f g h i j k Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". Astronomical Journal. 150 (3). 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. S2CID 118505114.
- ^ a b 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.
- ^ a b 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. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
- ^ Park, Sunkyung; et al. (2013). "Wilson-Bappu Effect: Extended to Surface Gravity". The Astronomical Journal. 146 (4): 73. arXiv:1307.0592. Bibcode:2013AJ....146...73P. doi:10.1088/0004-6256/146/4/73. S2CID 119187733.
- ^ a b 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. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209. S2CID 121883397.
- ^ a b McWilliam, Andrew (1990). "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances". The Astrophysical Journal Supplement Series. 74: 1075. Bibcode:1990ApJS...74.1075M. doi:10.1086/191527.
- ^ 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.
- ^ a b "* kap Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-05-20.
- ^ Allen, Richard Hinckley (1963) [1899]. Star Names: Their Lore and Meaning (Revised ed.). New York: Dover Publications. pp. 67–72. ISBN 0-486-21079-0.
- ^ Hoffleit, D.; Warren Jr., W. H. (1991). "VizieR Correlated Data, HR 3731". Bright Star Catalogue, 5th Revised Ed. VizieR. Retrieved 2010-05-20.
- ^ 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.
- ^ Samus, N. N.; Durlevich, O. V.; 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.