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J/AJ/106/1080          Lithium in Praesepe                    (Soderblom+, 1993)
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The evolution of the lithium abundances of solar-type stars. IV. Praesepe
        Soderblom D.R., Fedele S.B., Jones B.F., Stauffer J.R.,  Prosser C.F.
        <Astron. J. 106, 1080 (1993)>
        =1993AJ....106.1080S    (SIMBAD/NED Reference)
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ADC_Keywords: Clusters, open; Spectroscopy; Equivalent widths; Abundances

Abstract:
    Echelle observations are presented of lithium in 63 F and G dwarfs of
    the Praesepe cluster. For stars earlier than about G0V, Praesepe
    follows the same trends seen in the Hyades, which has approximately the
    same age and composition. Stars in Praesepe later than about G5V have
    more Li than their Hyades counterparts, possibly because Praesepe is
    slightly younger than the Hyades or has slightly lower metallicity.
    Significant differences in the abundance of Li are seen among stars of
    the same color, and, as in the Hyades, there is a tendency for the
    deviant stars to be binaries to the extent that duplicity in Praesepe
    is known. There are also stars with much less Li than most cluster
    members yet which appear to be true members of Praesepe. The close
    binary KW 181 has a normal Li abundance, despite the fact that similar
    close binaries in the Hyades are Li rich.



File Summary:
--------------------------------------------------------------------------------
 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
table2          46         63    Observations of lithium in Praesepe
                                  solar-type stars
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Byte-by-byte Description of file: table2
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   Bytes Format  Units   Label      Explanations
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   1-  3  I3     ---     KW         Number in catalog of Klein-Wassink (1927)
   6-  9  I4     ---     VL         []? Number in catalog of Vanderlinden (1933)
  12- 14  A3     ----    Sp         Spectral type, where available, taken from
                                     Corbally & Garrison (1986), Corbally &
                                     Garrison (1983) or Wilson (1963), in order
                                     of preference
  17- 20  F4.2   mag     B-V        B-V color from Mendoza (1967)
  23- 26  F4.2   mag     V-I        Johnson (V-I) from Mendoza (1967)
  29- 32  I4     K       Teff       Effective temperature
      35  A1     ---   l_WLi        Limit flag on WLi
  36- 38  I3     0.1nm   WLi        Equivalent width of Li 6708
      41  A1     ---   l_log(N(Li)) Limit flag on N(Li)
  42- 46  F5.2   ---     log(N(Li)) Lithium abundance (scale log N(H) = 12)
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Origin: AAS CD-ROM series, Volume 1, 1993

References:
  Corbally C.J. & Garrison R.F. 1986, AJ, 92, 90
  Corbally C.J. & Garrison R.F. 1983, JRASC, 77, 28
  Klein-Wassink, W.J. 1927, Groningen Publ. No. 41
  Mendoza E.E. 1967, Bol. Obs. Tonantzintla y Tacubaya, 4, 149
  Vanderlinden, H.L. 1933, Etude de l'amas de Praesepe (Gembloux: J. Duculot)
  Wilson O.C. 1963, ApJ, 138, 832
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(End)                                         Patricia Bauer [CDS]   14-Sep-1994