Kappa Leonis

Kappa Leonis, Latinized from κ Leonis, is a double star in the constellation Leo.[9] It was called Al-minħar al-asad, meaning the Lion's nose.[10] The name is corrupted as 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]

κ Leonis
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[1] mas
Distance201 ± 3 ly
(61.7 ± 0.8 pc)
Absolute magnitude (MV)0.66±0.028[5]
Details
Mass1.44[2] M☉
Radius17[6] R☉
Luminosity89[2] L☉
Surface gravity (log g)2.34[7] cgs
Temperature4,403±24[2] K
Metallicity [Fe/H]+0.01[7] dex
Rotational velocity (v sin i)10[8] km/s
Age4.33[2] Gyr
Other designations
Al Min'ħar al A'sad, κ Leo, 1 Leo, BD+26°1939, FK5 1244, HD 81146, HIP 46146, HR 3731, SAO 80807[9]
Database references
SIMBADdata

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. 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.
  2. 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.
  3. 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. 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. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272.
  5. 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.
  6. 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.
  7. 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.
  8. 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. "* kap Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-05-20.
  10. 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.
  11. Hoffleit, D.; Warren Jr., W. H. (1991). "VizieR Correlated Data, HR 3731". Bright Star Catalogue, 5th Revised Ed. VizieR. Retrieved 2010-05-20.
  12. 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.
  13. 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.
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