All Tables

Table 1: Comparison of Lick indices measured on ELODIE stellar spectra with indices from other databases of stellar spectra, for stars in common. The indices for Worthey et al. (1994) were taken from the table published in their paper. The indices for the Jones library were measured by ourselves (see text). The values are the mean offset (ELODIE-other database), the slope of the linear regression and the dispersion $\sigma$ around it (see Fig. 2).
Table 2: Various H $\gamma$ indices and resolutions (last column). H $\gamma$ _VHR and H $\gamma$ _Z are the new ones that we propose (see Sects. 5.3 and 5.4).
Table 3: Sensitivity of line equivalent widths to age (1-13 Gyr) and metallicity ( ${\rm [Fe/H]}=-1.7$ to 0.4). $\Delta _{\rm [Fe/H]}$ represents the fractional change in [Fe/H] needed to produce a 10% variation of the index value at the zero point ( $Z_\odot$ , 12 Gyr). $\Delta _{\rm age}$ is the similar quantity computed with the age. $\frac{\Delta_{\rm age}}{\Delta_{\rm [Fe/H]}}$ is the ratio of fractional change in age to the fractional change in [Fe/H] required to produce the same change in the index value (Jones & Worthey 1995; Worthey 1994). High absolute values correspond to high sensitivity to Z. This quantity is evaluated around the ( $Z_\odot$ , 12 Gyr) zero point. The last column reproduces the values in Table 6 of Worthey (1994) and in Table 2 of Jones & Worthey (1995).