Long-Slit Spectrophotometry of the H II Regions GUM 38a and GUM 38b

Details Long-Slit Spectrophotometry of the H II Regions GUM 38a and GUM 38b Long-Slit Spectrophotometry of the H II Regions GUM 38a and GUM 38b

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...486..847g&link_type=abstract

Astrophysical Journal v.486, p.847

Astronomy and Astrophysics

Astronomy

12

Ism: H Ii Regions, Ism: Individual Alphanumeric: Rcw 57, Ism: Abundances, Ism: Structure

Scientific paper

We present new long-slit spectrophotometric observations in the range 3700--7200 Angstroms of the H II regions Gum 38a and Gum 38b (RCW 57). We study the spatial distribution of reddening and excitation throughout the complex by means of emission-line intensities. From the strong reddening difference, we confirm that Gum 38a and Gum 38b are two individual complexes, the former being in the foreground. We derive chemical abundances in both nebulae, the results of which are similar to those of the Orion Nebula. This is consistent with the fact that the three nebulae are located at similar Galactocentric distances. We also discuss the general ionization structure of the complexes based on the spectral properties of several filaments and diffuse emission around the central bright knots of Gum 38a and beyond. In particular, we found an interesting filament with strong [O I] lambda lambda 6300, 6364 lines.

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