Are three systematic observational effects on abundance determinations in giant extragalactic H II regions?

Details Are three systematic observational effects on abundance determinations in giant extragalactic H II regions? Are three systematic observational effects on abundance determinations in giant extragalactic H II regions?

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983prhe.work..317r&link_type=abstract

IN: ESO Workshop on Primordial Helium, Garching, West Germany, February 2, 3, 1983, Proceedings (A83-50030 24-90). Garching, Wes

Astronomy and Astrophysics

Astronomy

2

Abundance, Astronomical Spectroscopy, H Ii Regions, Intergalactic Media, Interstellar Chemistry, Electron Energy, Helium Ions, Line Spectra, Oxygen Ions, Star Distribution, Stellar Structure

Scientific paper

The spectrophotometric data already available on giant H II regions in M101 are used to resolve the ionization structure of these objects. A rough approach to determine total helium and oxygen abundances by using the information on the spatial variation of ionic abundances yields Yp = .24 and delta Y/delta Z = 2.3. The radial variations of He(+) are found to be inconsistent with the behavior expected from the oxygen ionization structure. Ionization corrections for He obtained in the usual way may therefore be in error. The often incomplete coverage of these giant H II regions and related objects by small aperture observations possibly leads to systematic effects in the determination of chemical abundances.

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