Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..66...39b&link_type=abstract
Astrophysics and Space Science, vol. 66, no. 1, Nov. 1979, p. 39-46.
Astronomy and Astrophysics
Astrophysics
25
H Ii Regions, Radio Observation, Stellar Mass, Supernova Remnants, Angular Resolution, Galactic Radiation, H Alpha Line, H Beta Line, High Resolution, Hot Stars, Radio Spectra
Scientific paper
An optical survey of NGC 604, the brightest H ii complex in M33, has lead to the dis- covery of a single supernova remnant, in agreement with the predominantly thermal radio spectrum of the region. For the same NGC 604, we have derived from the Hfl flux and the evolutionary tracks of the stars, the population and the birth-rates of Main Sequence, high-mass stars. The computation is in agreement with the observations of the upper part of the stellar luminosity function. From the stellar population one predicts in the region a number of remnants significantly larger than 1. To explain this discrepancy, it is suggested the presence in NGC 604 of at least one overluminous, hot star (M2 - 9), which contributes to a large fraction of the ionizations
Benvenuti Piero
Dodorico Sandro
Dumontel M.
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