Bibcode
Centurion, M.; Vladilo, G.
Referencia bibliográfica
(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Phenomena in Galaxies, Puerto de la Cruz, Spain, July 4-15, 1988) Astrophysics and Space Science (ISSN 0004-640X), vol. 156, no. 1-2, June 1989, p. 51-56.
Fecha de publicación:
6
1989
Número de citas
0
Número de citas referidas
0
Descripción
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.