Local Group Galaxies: Abundances in NGC 3109

Details Local Group Galaxies: Abundances in NGC 3109 Local Group Galaxies: Abundances in NGC 3109

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..804..265l&link_type=abstract

PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP Conference Pr

Other

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Galaxies, Planetary Nebulae, H Ii Regions, Element Relative Abundance, Magellanic Clouds And Other Irregular Galaxies, Planetary Nebulae, Hii Regions, Emission And Reflection Nebulae, Chemical Composition And Chemical Evolution

Scientific paper

We present preliminary results of VLT spectroscopy follow-up of Planetary Nebulae (PNe) and HII regions in the dwarf Irregular galaxy NGC 3109. In total we have observed 15 PNe (of a total of 18) and about 50 HII: at least for 10 PNe and 10 HII regions the very faint [O III]4363 line is observed allowing to derive accurate abundances.
The comparison of the abundances with several other galaxies in the Local Group helps to trace general trends: these dwarf galaxies have low initial metallicities, but also He and N are less enriched compared to what it is observed in our Galaxy, M 33 or in the Magellanic Clouds. As already suspected in the LMC and the SMC, but now also seen at lower metallicities the abundances of O and Ne seems to be affected by nucleosynthesis during the life of the PN progenitor.

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