Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...437..239g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 437, no. 1, p. 239-261
Astronomy and Astrophysics
Astronomy
120
H Ii Regions, Infrared Astronomy, Interstellar Matter, Near Infrared Radiation, Star Formation, Stellar Evolution, Visible Spectrum, Wolf-Rayet Stars, Abundance, Astronomical Spectroscopy, Emission Spectra, H Alpha Line, Oxygen
Scientific paper
We present narrowband H-alpha imaging and long-slit optical and near-infrared spectroscopy of the giant H II region NGC 2363. The spectroscopic data are taken at two positions, in the brightest core and in a knot approximately 6 sec to the east, where we have found broad emission lines at 4660 A and 5810 A attributed to WC stars which suggest an age for the region between 3 and 5 Myr. The observations also confirm previously reported low-intensity broad components in H-alpha and (O III) emission lines, which extend some 500 pc across the region. For 15 different zones within the nebula, we derive the physical conditions and the chemical abundance of oxygen, nitrogen, neon, sulfur, and helium. No significant spatial variations are found for these abundances, with a mean value of oxygen 12 + log(O/H) = 7.89 and a helium mass fraction of y = 0.24. electron temperatures deduced from the Paschen discontinuity have been obtained for two different regions. These Paschen temperatures are significantly smaller than those obtained from the collisionally excited emission line diagnostics, suggesting the presence of large temperature fluctuations. The effect of these temperature fluctuations in the determination of the chemical abundances has been estimated.
Castañeda Hector
Cepa Jordi
Diaz Angeles I.
Garcia-Vargas Maria Luisa
Gonzalez-Delgado Rosa M.
No associations
LandOfFree
Violent star formation in NGC 2363 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 Violent star formation in NGC 2363, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Violent star formation in NGC 2363 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1326511