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Stellar vs. Hii region chemical abundances in nearby galaxies

Published online by Cambridge University Press:  09 March 2010

Fabio Bresolin
Fabio Bresolin*
Affiliation:
Institute for Astronomy, 2680 Woodlawn Drive, 96822 Honolulu, HI, USA email: bresolin@ifa.hawaii.edu
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Abstract

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We have obtained new spectrophotometric data for 28 Hii regions in the spiral galaxy NGC 300, a member of the nearby Sculptor Group. The detection of several auroral lines has allowed us to measure electron temperatures and direct chemical abundances for the whole sample. We determine for the first time in this galaxy a radial gas-phase oxygen abundance gradient based solely on auroral lines. The gradient corresponds to −0.077±0.006 dex kpc−1, which agrees very well with the galactocentric trend in metallicity obtained for 29 B and A supergiants in the same galaxy. The intercept of the regression for the nebular data virtually coincides with the intercept obtained from the stellar data. This result provides increased confidence on the direct method to determine extragalactic nebular abundances.

Keywords

HII regionsISM: abundancesstars: abundancesgalaxies: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S265: Chemical Abundances in the Universe: Connecting First Stars to Planets , August 2009 , pp. 233 - 236
Copyright
Copyright © International Astronomical Union 2010

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