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Helium abundances in inner Galaxy planetary nebulae

Published online by Cambridge University Press:  23 April 2010

Oscar Cavichia ,
Roberto D. D. Costa  and
Walter J. Maciel
Oscar Cavichia
Affiliation:
IAG, University of São Paulo, 05508-900, São Paulo-SP, Brazil email: cavichia@astro.iag.usp.br
Roberto D. D. Costa
Affiliation:
IAG, University of São Paulo, 05508-900, São Paulo-SP, Brazil
Walter J. Maciel
Affiliation:
IAG, University of São Paulo, 05508-900, São Paulo-SP, Brazil
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Abstract

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New helium abundances of planetary nebulae located towards the bulge of the Galaxy were derived, based on observations made at OPD (Brazil). We present accurate helium abundances for 56 PNe located towards the galactic bulge. The data show good agreement with other results in the literature, in the sense that the distribution of the abundances is similar to previous works. Furthermore, the radial helium gradient is extended towards the galactic center. The results show that no trend can be identified when comparing the internal gradient (R ≤ 4 kpc) to the whole galactic disk.

Keywords

ISM: planetary nebulae: generalGalaxy: abundancesevolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 171 - 172
Copyright
Copyright © International Astronomical Union 2010

References

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