Saturation and spectral asymmetry in 1612MHz shell masers

Details Saturation and spectral asymmetry in 1612MHz shell masers Saturation and spectral asymmetry in 1612MHz shell masers

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mnras.391..334g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 391, Issue 1, pp. 334-342.

Astronomy and Astrophysics

Astronomy

1

Masers, Molecular Processes, Stars: Agb And Post-Agb, Stars: Mass-Loss, Radio Lines: Stars

Scientific paper

At least one `dying' asymptotic giant branch star has been observed to show a strong spectral asymmetry in the decay of its 1612MHz OH maser spectrum, with the red peak decaying substantially more rapidly than the blue peak. We have tested a model which explains the general behaviour of such stars to see if it can also explain asymmetry of this type. We find that it is actually very difficult to overcome a natural propensity for the blue peak to decay more rapidly, which is tied to the distribution of OH molecules and pumping radiation in the model. A possible solution is the presence of strongly saturating rays in the blue peak from a large stellar radiosphere, which decay more slowly than an almost unsaturated red peak.

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