The metallicity of circumnuclear star forming regions

DÍAZ, A. I.; TERLEVICH, E.; CASTELLANOS, M.; HÄGELE, G

La Palma, Islas Canarias, España

Congreso; The Metal Rich Universe; 2006

Instituto de Astrofísica de Canarias

We present a spectrophotometric study of circumnuclear star forming regions (CNSFR) in the early type spiral galaxies: NGC 2903, NGC 3351 and NGC 3504, all of them of over solar metal- licity according to standard empirical calibrations. A detailed determination of their abundances is made after careful subtraction of the very prominent underlying stellar absorption. It is found that most regions show the highest abundances in HII region-like objects. The relative N/O and S/O abundances are discussed. In is also shown that CNSFR, as a class, segregate from the disk HII region family, clustering around smaller “softness parameter” values, and therefore higher ionizing temperatures.