The log Ne-log R diagram for compact H II regions

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Structure, H Ii Regions, Hydrogen Ions, Interstellar Gas, Cosmic Dust, Galactic Evolution, Galactic Rotation, Nebulae, O Stars, Radio Astronomy, Stellar Evolution, Tables (Data)

Scientific paper

Statistical characteristics of galactic H II regions are examined, along with the influence of dust on these characteristics and on the resolution of relevant components. It is assumed that although the observed parameters belong to different H II regions, they may represent an evolutionary sequence. Results indicate that the upper limit of the excitation parameter for regions ionized by a single star is 80, provided dust absorption is taken into consideration. From a statistical standpoint, regions with an excitation parameter greater than 80 should contain two or more early type stars, which are responsible for gas ionization.

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