SIMBAD references

2004ApJS..153..501G - Astrophys. J., Suppl. Ser., 153, 501-522 (2004/August-0)

Chemical abundances of the galactic H II region NGC 3576 derived from very large telescope echelle spectrophotometry.

GARCIA-ROJAS J., ESTEBAN C., PEIMBERT M., RODRIGUEZ M., RUIZ M.T. and PEIMBERT A.

Abstract (from CDS):

We present echelle spectrophotometry of the Galactic H II region NGC 3576. The data have been taken with the VLT UVES echelle spectrograph in the 3100-10400 Å range. We have measured the intensities of 458 emission lines, 344 are permitted lines of H0, He0, C+, N0, N+, N++, O0, O+, Ne+, S++, Si0, Si+, Ar0, and Ar+; some of them are produced by recombination and others mainly by fluorescence. Electron temperatures and densities have been determined using different continuum and line intensity ratios. We have derived He+, C++, O+, O++, and Ne++ ionic abundances from pure recombination lines. We have also derived abundances from collisionally excited lines for a large number of ions of different elements. Remarkably consistent estimations of t2 have been obtained by comparing Balmer and Paschen with [O III] temperatures, and O++ and Ne++ ionic abundances obtained from collisionally excited and recombination lines. The chemical composition of NGC 3576 is compared with those of other Galactic H II regions and with the one from the Sun. A first approach to the gas-phase Galactic radial abundance gradient of C as well as of the C/O ratio has been made.

Abstract Copyright:

Journal keyword(s): ISM: Abundances - ISM: Individual: NGC Number: NGC 3576 - ISM: H II Regions - Line: Identification

Status at CDS:  

CDS comments: HD 974999 is a misprint for HD 97499.

Simbad objects: 16

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2020.06.03-22:47:37

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