We have obtained medium-resolution , deep optical long-slit spectra of the bulge planetary nebula ( PN ) M 2-24 .
The spectrum covers the wavelength range from 3610–7330 Å .
Over two hundred emission lines have been detected .
The spectra show a variety of optical recombination lines ( ORLs ) from C , N , O and Ne ions .
The diagnostic diagram shows significant density and temperature variations across the nebula .
Our analysis suggests that the nebula has a dense central emission core .
The nebula was thus studied by dividing it into two regions : 1 ) an high ionization region characterized by an electron temperature of T _ { e } = 16 300 K and a density of \log N _ { e } ( { cm } ^ { -3 } ) = 6.3 ; and 2 ) a low ionization region represented by T _ { e } = 11 400 K and \log N _ { e } ( { cm } ^ { -3 } ) = 3.7 .
A large number of ORLs from C , N , O and Ne ions have been used to determine the abundances of these elements relative to hydrogen .
In general , the resultant abundances are found to be higher than the corresponding values deduced from collisionally excited lines ( CELs ) .
This bulge PN is found to have large enhancements in two \alpha -elements , magnesium and neon .