Kinematics and Dynamics of the Galactic Bulge through Planetary Nebulae

The Galactic Bulge: the Stellar and Planetary Nebulae Populations

We compare abundances patterns in the Bulge for elements observed in stars and in planetary nebulae. Some α elements, like Mg and Ti, are overabundant in respect to Fe, and others are not, like He, O, Si, S, Ar, Ca. The first ones favor a quick evolution of the Galactic Bulge, and the seconds a much slower one.

Radial velocities of planetary nebulae towards the Galactic bulge

Accurate radial velocities for a sample of 71 planetary nebulae, mostly located in the direction of the Galactic Centre, are presented. Most of the nebulae discussed in this paper are likely members of the Galactic bulge, based on their radial velocity, longitude and derived distance. The data give a large improvement over existing catalogues, doubling the sample of bulge planetary nebulae with...

Observations of planetary nebulae in the Galactic Bulge

High quality spectrophotometric observations of 30 Planetary Nebulae in the Galactic Bulge have been made. Accurate reddenings, plasma parameters, and abundances of He, O, N, S, Ar, Cl are derived. We find the abundances of O, S, Ar in the Planetary Nebulae in the Galactic Bulge to be comparable with the abundances of the Planetary Nebulae in the Disk, high abundances being maybe slightly more ...

Central Stars of Planetary Nebulae in the Galactic Bulge

Context. Optical high-resolution spectra of five central stars of planetary nebulae (CSPN) in the Galactic bulge have been obtained with Keck/HIRES in order to derive their parameters. Since the distance of the objects is quite well known, such a method has the advantage that stellar luminosities and masses can in principle be determined without relying on theoretical relations between both qua...

Stars and Planetary Nebulae in the Galactic Bulge