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J/AJ/106/1080          Lithium in Praesepe                    (Soderblom+, 1993)

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)
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
ReadMe 80 . This file table2 46 63 Observations of lithium in Praesepe solar-type stars
Byte-by-byte Description of file: table2
Bytes Format Units Label Explanations
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)
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 Origin: AAS CD-ROM series, Volume 1, 1993
(End) Patricia Bauer [CDS] 14-Sep-1994
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