Other
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..417h&link_type=abstract
Astrophysical Journal, Part 1, vol. 224, Sept. 1, 1978, p. 417-436.
Other
159
Abundance, Chemical Composition, Galactic Structure, H Ii Regions, H Lines, Intergalactic Media, Nebulae, Electron Density (Concentration), Forbidden Bands, Helium, Neon, Nitrogen, Oxygen, Planetary Nebulae, Spiral Galaxies, Sulfur, Tables (Data)
Scientific paper
Line intensities are compiled for a large number of galactic H II regions, and physical conditions and chemical abundances are computed. Detailed observations of extragalactic H II regions are examined in order to deduce the electron temperatures from a measurement of the forbidden N II line at 5755 A and to deduce a more accurate sulfur abundance from the forbidden S III line at 6312 A. The questions of abundance gradients in the Galaxy and of line intensities as abundance indicators are considered. Improved abundances are presented for an inner-arm H II region in M101, and abundance gradients across M101 are compared with those in the Galaxy. The results show that: (1) there are oxygen and nitrogen abundance gradients among H II regions in the Galaxy; (2) certain line ratios exhibit generally the same gradients in the Galaxy as in other spiral galaxies; and (3) abundance gradients in M101 are similar to those in the Galaxy.
No associations
LandOfFree
The chemical composition of galactic and extragalactic H II regions 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 The chemical composition of galactic and extragalactic H II regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The chemical composition of galactic and extragalactic H II regions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-938753