2011MNRAS.412.1367T

Query : 2011MNRAS.412.1367T

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):

Optical integral field spectroscopy of the archetype protoplanetary disc LV 2 in the Orion nebula is presented, taken with the Very Large Telescope (VLT) FLAMES/Argus fibre array. The detection of recombination lines (RLs) of C II and O II from this class of objects is reported, and the lines are utilized as abundance diagnostics. The study is complemented with the analysis of Hubble Space Telescope (HST) Faint Object Spectrograph ultraviolet and optical spectra of the target contained within the Argus field of view. By subtracting the local nebula background the intrinsic spectrum of the proplyd is obtained and its elemental composition is derived for the first time. The proplyd is found to be overabundant in carbon, oxygen and neon compared to the Orion nebula and the Sun.

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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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 CPD-69 177 WD* 03 10 31.0195960176 -68 36 03.380768388 10.757 11.413 11.394 11.47 11.558 DA3.0 299 0
2 NAME tet01 Ori A2 * 05 35 15.8217 -05 23 14.097           ~ 10 0
3 * tet01 Ori A Ae* 05 35 15.8254015008 -05 23 14.334699480 5.87 6.75 6.73 6.42 6.21 B0V 508 0
4 NAME tet01 Ori B3 * 05 35 16.064 -05 23 07.05           ~ 13 0
5 * tet01 Ori B EB* 05 35 16.1339860056 -05 23 06.784444248 7.71 8.20 7.96     B1V 380 1
6 * tet01 Ori C SB* 05 35 16.4662967280 -05 23 22.921811880 4.20 5.15 5.13 4.91 4.73 O7Vp 1479 1
7 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
8 * tet01 Ori G Y*O 05 35 16.723 -05 23 16.56 14.712 13.704 13.678   13.081 K0.7 105 1
9 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
10 NAME Ori I As* 05 38 -02.8           ~ 653 0
11 CD-30 17706 WD* 20 10 56.8486912016 -30 13 06.627142663 11.654 12.286 12.242 12.311 12.381 DA3.1 267 0
12 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 673 1

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