CDROM/AJ/V106/P1080 Lithium in Praesepe (Soderblom+ 1993) ================================================================================ The Evolution of the Lithium Abundances of Solar-Type Stars. IV. Praesepe David R. Soderblom, Stephen B. Fedele, Burton F. Jones, John R. Stauffer & Charles F. Prosser <1993, AJ, 106, 1080> =1993AJ....106.1080S ================================================================================ 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: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table2.dat 46 63 Observations of lithium in Praesepe solar-type stars -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 I3 --- KW *Number in catalog of Klein-Wassink (1927) 4- 9 I6 --- VL *Number in catalog of Vanderlinden (1933) 10-11 2X --- --- Blank 12-14 A3 --- Sp *Spectral type 15-20 F6.2 mag B-V *B-V color 21-26 F6.2 mag V-I Johnson (V-I) from Mendoza (1967) 27-32 I6 K Teff Effective temperature 33-34 2X --- --- Blank 35 A1 --- l_W6708 [< ] Limiting character for W6708 36-38 I3 10-4nm W6708 Equivalent width of Li 6708 39-40 2X --- --- Blank 41 A1 --- l_N_Li [< ] Limiting character N_Li 42-46 F5.2 --- N_Li log N(Li) on scale where log N(H) = 12 -------------------------------------------------------------------------------- Notes for file: table2.dat -------------------------------------------------------------------------------- KW: Number in catalog of Klein-Wassink, W.J. 1927, Groningen Publ. No. 41 VL: Number in catalog of Vanderlinden, H.L. 1933, Etude de l'amas de Praesepe (Gembloux: J. Duculot) Sp: Spectral type, where available, taken from Corbally & Garrison 1986, AJ, 92, 90, Corbally & Garrison 1983, JRASC, 77, 28, or Wilson 1963, ApJ, 138, 832, in order of preference B-V: B-V color from Mendoza 1967, Bol. Obs. Tonantzintla y Tacubaya, 4, 149 -------------------------------------------------------------------------------- ================================================================================ (End) Lee Brotzman [ADS] 19-Mar-1995