... properties

Appendices A-C are only available in electronic form at http://www.edpsciences.org

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... widths

For those readers interested in computing expected errors in atomic indices measured in Å, it is possible to use

$$\sigma(I_{\rm a}) \simeq \frac{c_1 - c_2 \; I_{\rm a}}{{\mbox{\rm {\it S/N}({\rm\AA})}}},$$

where c₁ and c₂ coefficients for typical line-strengh features are given in Table 1 of Cardiel et al. (1998). Note that in this case the error estimates depend on the absolute index value.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... (2001)

Available at http://www.sdss.mpg.de/sdssMPA/Spectral_Tools/

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... indicators

In the computation of the numbers listed in Tables 2-7 we have assumed that all the spectral data are not correlated. Since some of the line-strength indices and colors overlap, we are implicitly assuming that overlapping features are obtained in independent measurements (i.e. different spectra and photometric colors).

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.