All Tables

Table 1: Log of the observations for NGC 6752. Date and time are UT, exposure times are in seconds. For both exposures the field center is at RA(2000) = 19:10:51.780, Dec(2000) = -59:58:54.70.
Table 2: List and relevant information for the target stars observed in NGC 6752. ID, B, V and coordinates (J2000) are taken from Momany et al. (2004); J, K are from the 2MASS catalog; radial velocities RV's (in km s^-1) from both gratings are heliocentric; listed S/N values are per pixel, computed from spectra acquired with HR11 when available, else with HR13; stars with "*'' in notes have V-K colours that deviate from the ones expected for RGB stars (see text). Stars with " $\dagger$ '' in notes have too few lines (being warm and/or of low S/N) to obtain reliable measurements and were dropped from further analysis. The complete table is available electronically at the CDS; we show here a few lines for guidance.
Table 3: Adopted atmospheric parameters and derived iron abundances in stars of NGC 6752; Nr indicates the number of lines used in the analysis. The complete table is available only in electronic form at the CDS.
Table 4: Sensitivities of abundance ratios to variations in the atmospheric parameters and to errors in the equivalent widths, as computed for a typical program star with $T_{\rm eff} \sim 4750$ K. The total error is computed as the quadratic sum of the three dominant sources of error, $T_{\rm eff}$ , $v_{\rm t}$ and errors in the EWs, scaled to the actual errors as described in the text (Col. 8: tot.1) or as the sum of all contributions (Col. 9: tot.2).
Table 5: Abundances of O and Na in NGC 6752. [Na/Fe] values are corrected for departures from LTE. HR is a flag for the grating used (1 = HR13 only, 2 = HR11 and HR13, 3 = HR11 only) and lim is a flag discriminating between real detections and upper limits in the O measurements (0 = upper limit, 1 = detection). The complete table is available only in electronic form at the CDS.