Physical parameters of reflection nebulae in the galaxy

Details Physical parameters of reflection nebulae in the galaxy Physical parameters of reflection nebulae in the galaxy

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.156...51c&link_type=abstract

(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Pheno

Astronomy and Astrophysics

Astrophysics

Hydrogen Clouds, Interstellar Matter, Milky Way Galaxy, Reflection Nebulae, B Stars, Magnesium, Photoionization, Spectral Line Width, Stellar Radiation

Scientific paper

Given observed equivalent widths of Mg II and Mg I absorptions due to an interstellar cloud in which a late-B star is embedded, it is shown that the basic physical parameters (kinetic temperature, mean density, electron density, and radius) can be constrained. Hydrogen ionization by means of cosmic rays and the effect of the stellar radiation field on the magnesium ionization equilibrium are taken into account. The method is applied to the reflection nebula surrounding the star HD 26676. The resulting solutions for the radius and temperature of the nebulosity are comparable to the typical values derived for diffuse interstellar clouds from optical and 21-cm measurements.

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