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60 Leonis

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This article is about b Leonis; it is not to be confused with β Leonis.
60 Leonis
Location of 60 Leonis (circled in red)
Observation data
Epoch J2000      Equinox J2000
Constellation Leo[1]
Right ascension 11h 02m 19.77577s[2]
Declination +20° 10′ 47.4265″[2]
Apparent magnitude (V) 4.398[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type A1 Vm[5]
U−B color index +0.05[6]
B−V color index +0.07[6]
Astrometry
Radial velocity (Rv)−11.10±0.7[7] km/s
Proper motion (μ) RA: −8.67[2] mas/yr
Dec.: 39.07[2] mas/yr
Parallax (π)25.73±0.18 mas[2]
Distance126.8 ± 0.9 ly
(38.9 ± 0.3 pc)
Absolute magnitude (MV)+1.47[1]
Details[8]
Mass2.11±0.06 M☉
Radius1.80±0.07 R☉
Luminosity24.1±1.4 L☉
Surface gravity (log g)4.22±0.20 cgs
Temperature9,540±180 K
Metallicity 0.00±0.10 dex
Rotational velocity (v sin i)17.2±2.0[9] km/s
Age195±15 Myr
Other designations
b Leo, 60 Leo, NSV 18592, AAVSO 1057+20, BD+20°2547, FK5 2880, HD 95608, HIP 53954, HR 4300, SAO 81637[10]
Database references
SIMBADdata

60 Leonis is a star in the zodiac constellation of Leo, located 127 light years from the Sun. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.4.[3] The star is moving closer to the Earth with a heliocentric radial velocity of −11 km/s.[7]

This is an Am star[11] with a stellar classification of A1 Vm,[5] although LeBlanc et al. (2015) consider it an Ap star.[9] The atmosphere displays clear indications of stratification of iron with no significant magnetic field detected.[9] It is 195 million years old with a relatively low projected rotational velocity of 17 km/s.[9] The star has 2.11 times the mass of the Sun and 1.80 times the Sun's radius. It is radiating 24.1 times the Sun's luminosity from its photosphere at an effective temperature of 9,540 K.[8]

References

  1. ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. ^ 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.
  3. ^ a b Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H.
  4. ^ Takeda, Yoichi; Kawanomoto, Satoshi; Ohishi, Naoko; Kang, Dong-Il; Lee, Byeong-Cheol; Kim, Kang-Min; Han, Inwoo (2018). "Photospheric carbon, nitrogen, and oxygen abundances of A-type main-sequence stars*". Publications of the Astronomical Society of Japan. 70 (5): 91. arXiv:1807.06265. Bibcode:2018PASJ...70...91T. doi:10.1093/pasj/psy091.
  5. ^ a b Sreedhar Rao, S.; Abhyankar, K. D. (1991). "MK morphological study of AM stars at 66 A/mm". Journal of Astrophysics and Astronomy. 12 (2): 133. Bibcode:1991JApA...12..133S. doi:10.1007/BF02709302. S2CID 59324843.
  6. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  7. ^ a b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  8. ^ a b Maestro, V.; Che, X.; Huber, D.; Ireland, M. J.; Monnier, J. D.; White, T. R.; Kok, Y.; Robertson, J. G.; Schaefer, G. H.; Brummelaar, T. A. T.; Tuthill, P. G. (2013). "Optical interferometry of early-type stars with PAVO@CHARA - I. Fundamental stellar properties". Monthly Notices of the Royal Astronomical Society. 434 (2): 1321. arXiv:1306.5937. Bibcode:2013MNRAS.434.1321M. doi:10.1093/mnras/stt1092. S2CID 2361434.
  9. ^ a b c d LeBlanc, F.; et al. (November 2015). "Project VeSElkA: results of abundance analysis I - HD 71030, HD 95608, HD 116235 and HD 186568". Monthly Notices of the Royal Astronomical Society. 453 (4): 3766–3771. Bibcode:2015MNRAS.453.3766L. doi:10.1093/mnras/stv1466.
  10. ^ "* b Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 6 October 2012.
  11. ^ Adelman, Saul J.; et al. (May 1999). "Elemental abundance analyses with DAO spectrograms - XXI. The hot metallic-lined stars 60 Leonis and 6 Lyrae". Monthly Notices of the Royal Astronomical Society. 305 (3): 591–601. Bibcode:1999MNRAS.305..591A. doi:10.1046/j.1365-8711.1999.02435.x.
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