OIII / H-Beta Ratios of Emission Regions in the Arms and Disk of M33 and Luminosity Functions at the Fronts of the Arms

Details OIII / H-Beta Ratios of Emission Regions in the Arms and Disk of M33 and Luminosity Functions at the Fronts of the Arms OIII / H-Beta Ratios of Emission Regions in the Arms and Disk of M33 and Luminosity Functions at the Fronts of the Arms

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...104...15b&link_type=abstract

Astronomy and Astrophysics, Vol.104, P. 15, 1981

Astronomy and Astrophysics

Astrophysics

13

Scientific paper

We used a Fabry-Perot interferometer to obtain a great number of coherent spectrophotometric measures of both normal H ii regions and faint, diffuse emission regions in M 33. The results allowed us to find, in the central part of the galaxy, the same general centre-to-edge increase of Σ[O III]/Hβ as found by Searle (1971), and suggest ionization of the disk by the young stars of the arms.
We also showed an excitation disparity between the northern and southern parts of M 33, Σ[O III]/Hβ being higher in the southern part than in the northern part. This is true for H II regions in the arms, as well as for the diffuse disk.
All the observational results (line ratios, early star numbers at the fronts of the arms, Hα fluxes) for the southern and northern arms of M 33 and the galactic arms near the Sun are in agreement with a very simple model, in which the abundances and electronic temperatures are the same, and the luminosity functions are the same except for a truncation of those stars more massive than O7 in the northern arm of M33.

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