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2001A&A...380..300E - Astronomy and Astrophysics, volume 380, 300-308 (2001/12-2)
Abundances of recently discovered planetary nebulae towards the Galactic Bulge.
ESCUDERO A.V. and COSTA R.D.D.
Abstract (from CDS):
In this work we report spectrophotometric observations of a planetary nebula sample towards the galactic bulge. A total of 45 PNe was observed and their physical parameters (electron density and temperature) were derived. Ionic abundances were calculated using a three-level atom model and abundances were derived through ionisation correction factors.
Result. show low abundance objects at high galactic latitudes, indicating a possible vertical gradient inside the bulge. A few objects with low N/O ratio were found, which could have originated from old, low mass progenitors.
Result. show low abundance objects at high galactic latitudes, indicating a possible vertical gradient inside the bulge. A few objects with low N/O ratio were found, which could have originated from old, low mass progenitors.
Abstract Copyright: ∼
Journal keyword(s): ISM: planetary nebulae - galactic bulge - techniques: spectroscopic
VizieR on-line data: <Available at CDS (J/A+A/380/300): nebulae.dat fluxes.dat tables.tex>
Simbad objects: 52
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