Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.295..401e&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 295, No. 2, p. 401 (1998).
Astronomy and Astrophysics
Astronomy
208
Line: Identification - Ism: Abundances - H Ii Regions - Ism: Individual: Orion Nebula
Scientific paper
We present echelle spectroscopy in the 3500- to 7060-Å range for two positions of the Orion nebula. The data were obtained using the 2.1-m telescope at Observatorio Astrónmico Nacional in San Pedro Mártir, Baja California. We have measured the intensities of about 220 emission lines, in particular 81 permitted lines of C+, N+, N++, 0°, 0+, Ne0, Si+, Si++ and S+, some of them produced by recombination only and others mainly by fluorescence. We have determined electron temperatures, electron densities and ionic abundances using different continuum and line intensity ratios. We derived the He, C and 0 abundances from recombination lines and find that the C/H and 0/H values are very similar to those derived from B stars of the Orion association, and that these nebular values are independent of the temperature structure. We have also derived abundances from collisionally excited lines. These abundances depend on the temperature structure; accurate t2 values have been derived comparing the On recombination lines with the [O III] collision ally excited lines. The gaseous abundances of Mg, Si and Fe show significant depletions, implying that a substantial fraction of these atoms is tied up in dust grains. The derived depletions are similar to those found in warm clouds of the Galactic disc, but are not as large as those found in cold clouds. A comparison of the solar and Orion chemical abundances is made.
Escalante Vladimir
Esteban Cesar
Peimbert Manuel
Torres-Peimbert Silvia
No associations
LandOfFree
Chemical composition of the Orion nebula derived from echelle spectrophotometry does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Chemical composition of the Orion nebula derived from echelle spectrophotometry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chemical composition of the Orion nebula derived from echelle spectrophotometry will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1605513