Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pkas....8...83k&link_type=abstract
Publications of the Korean Astronomical Society, vol.8, no.1, p.83-104
Astronomy and Astrophysics
Astronomy
1
Scientific paper
In principle, both radiation and collision are capable of pumping the SiO masers. In order to check which pumping mechanism is more efficient, we calculated the rate equation for our model including the 3 vibrational states with 7 rotational states of each vibrational state. Through solving the radiative transfer equation with Sovolev approximation, we estimated the line profiles from an expanding envelope for several transitions. It is found that the collision works more efficiently than the radiation for the inversion in excited vibrational states. However in an expanding envelope model we could not get the strong line intensity as observed one because the population inversion is possible only in a small restricted region. For the enough population inversion to get the observed maser intensity, the number density of SiO and hydrogen molecules should be up to about 2e5 /cm3 and 1e9 /cm3, respectively, and the inversion should be occurred in the region of no less than 11014 cm.
Kim Eunhyeuk
Lee Sang-Gak
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