Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...193...93t&link_type=abstract
Astrophysical Journal, vol. 193, Oct. 1, 1974, pt. 1, p. 93-95. Research supported by the University of Montreal, National Resea
Astronomy and Astrophysics
Astrophysics
36
B Stars, Early Stars, Galactic Radiation, O Stars, Stellar Radiation, Ultraviolet Radiation, Cosmic Dust, Galactic Nuclei, Gas Ionization, Ionizing Radiation, Milky Way Galaxy, Optical Thickness, Planetary Nebulae
Scientific paper
The ionizing radiation from the O5-B1 early-type stars in the Galaxy is discussed, and the flux of this radiation is estimated to be approximately 7.5 x 10 to the 52nd photons/sec. Adopting the results of Cahn and Kaler (1971) on the density and number of the optically thin planetary nebulae in the Galaxy, it is shown that the total ultraviolet radiation which escapes from these nebulae is very significant, and is of the order of that produced by the early-type stars. It is proposed that this radiation is an important source of ionization of the diffuse interstellar medium, and of heat supply to the interstellar grains. This radiation is very important particularly in the regions of the galactic center.
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