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2011MNRAS.412.1367T - Mon. Not. R. Astron. Soc., 412, 1367-1380 (2011/April-1)
Chemical abundances in the protoplanetary disc LV 2 (Orion): clues to the causes of the abundance anomaly in H II regions.
TSAMIS Y.G., WALSH J.R., VILCHEZ J.M. and PEQUIGNOT D.
Abstract (from CDS):
The simultaneous coverage over LV 2 of the C III]λ1908 and [O III]λ5007 collisionally excited lines (CELs) and C II and O II RLs has enabled us to measure the abundances of C^2 +^ and O^2 +^ for LV 2 with both sets of lines. The two methods yield consistent results for the intrinsic proplyd spectrum, but not for the proplyd spectrum contaminated by the generic nebula spectrum, thus providing one example where the long-standing abundance anomaly plaguing metallicity studies of H II regions has been resolved. These results would indicate that the standard forbidden-line methods used in the derivation of light metal abundances in H II regions in our own and other galaxies underestimate the true gas metallicity.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): planets and satellites: general - protoplanetary discs - stars: pre-main-sequence - stars: protostars - ISM: abundances - H {sc ii} regions - ISM: individual objects: LV2 - ISM: individual objects: 167-317 - ISM: individual objects: Orion nebula
Simbad objects: 12
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