Computer Science
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011noao.prop..163p&link_type=abstract
NOAO Proposal ID #2011A-0163
Computer Science
Scientific paper
To test galactic chemical evolution models, it is important to have accurate abundance ratios as observational constraints. There are two effects that increase the O/H ratio over the usually adopted constraints based on HII regions: (a) The fraction of O trapped in dust grains that increase O/H by about 0.1 dex (Peimbert & Peimbert, 2010); (b) the presence of temperature inhomogeneities that increase the O/H by approximately 0.3 dex. The objective of this proposal is to study the second of these effects. Our main goal is to measure several He I lines with high signal to noise in order to determine the helium temperature which is rarely measured. In order to do this we want to observe long slit spectra for a small sample of extragalactic low and very low metallicity H II regions (most of them dwarf H II galaxies). From the comparison of such temperature with the oxygen temperature we will obtain the temperature inhomogeneities (t^2) and use them to determine the abundance discrepancy factor for oxygen, and recalibrate the diagram O_23 vs. O/H.
Peimbert Antonio
Pena Angelica M.
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