Astronomy and Astrophysics – Astronomy
Scientific paper
May 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974mmsai..45..335f&link_type=abstract
(Ministero della Pubblica Istruzione, CNR, and Universita di Trieste, European Regional Meeting in Astronomy, 2nd, Trieste, Ital
Astronomy and Astrophysics
Astronomy
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.
Felli Marcello
Panagia Nino
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