58 Leonis

58 Leonis
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 11h 00m 33.64811s[1]
Declination +03° 37′ 02.9766″[1]
Apparent magnitude (V) 4.852[2]
Characteristics
Spectral type K0.5 III Fe-0.5[3]
B−V color index 1.163[2]
Astrometry
Radial velocity (Rv)+5.98[2] km/s
Proper motion (μ) RA: +14.82[1] mas/yr
Dec.: −16.51[1] mas/yr
Parallax (π)9.05 ± 0.20 mas[1]
Distance360 ± 8 ly
(110 ± 2 pc)
Absolute magnitude (MV)−1.04[4]
Details
Mass1.89[2] M☉
Luminosity182[2] L☉
Surface gravity (log g)1.8[4] cgs
Temperature4,519±52[2] K
Metallicity [Fe/H]−0.16±0.10[4] dex
Age1.69[2] Gyr
Other designations
58 Leo, BD+04° 2407, FK5 1284, HD 95345, HIP 53807, HR 4291, SAO 118610, CCDM J11006+0337AB[5]
Database references
SIMBADdata

58 Leonis is a possible binary star[6] system in the southern part of the constellation of Leo, near the border with Sextans. It shines with an apparent magnitude of 4.85,[2] making it bright enough to be seen with the naked eye. An annual parallax shift of 9.05±0.20 mas yields a distance estimate of 360 light years. It is moving further from the Sun with a heliocentric radial velocity of +6 km/s.[2]

This orange hued star is an evolved K-type giant with a stellar classification of K0.5 III Fe-0.5,[3] indicating a mild underabundance of iron in its spectrum. It was identified as a barium star by P. M. Williams (1971).[7] These are theorized to be stars that show an enrichment of s-process elements by mass transfer from a now-white dwarf companion when it passed through the asymptotic giant branch stage.[8] MacConnell et al. (1972) classified 58 Leonis as a marginal barium star.[4] De Castro et al. (2016) consider this to be only a probable barium star, because of the low degree of s-process enrichment, and they rejected it from their sample. Rather than having an evolved companion, it may instead have formed from a cloud that was mildly enriched with s-process elements.[4]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference deCastro2016 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Williams1971 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Bergeat1997 was invoked but never defined (see the help page).