Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969ap%26ss...3..292m&link_type=abstract
Astrophysics and Space Science, Volume 3, Issue 2, pp.292-300
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
Radio measurements of the electron temperature of Hii regions are obtained from the ratio of the brightness temperature of a hydrogen recombination line to that of the adjacent continuum, while optical measurements are obtained from the ratio of [O iii] forbidden-line intensities. The radio and optical measurements made under the assumption of an isothermal Hii region,T R andT opt respectively, are combined to derive a temperature distribution for an entire nebula. A spherical Hii region in local thermodynamic equilibrium with constant density which is optically thin in both the line and the continuum is used as a model. Assuming linear temperature gradients withT R=6000K andT opt=10000K, it is found thatT=12000K (1 0.74r/R), wherer is the distance from the center andR is the radius of the nebula.
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