A new expectation function for fitting the OH curves of circumstellar maser lines.

Details A new expectation function for fitting the OH curves of circumstellar maser lines. A new expectation function for fitting the OH curves of circumstellar maser lines.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..115..387d&link_type=abstract

Astronomy and Astrophysics Supplement, v.115, p.387

Astronomy and Astrophysics

Astrophysics

2

Masers, Methods: Data Analysis, Stars: Agb And Post-Agb, Radio Lines: Stars

Scientific paper

For the purpose of measuring the periods and the spatial extent of OH masing regions in the circumstellar envelopes of OH/IR stars, it has become a common practice to use a piecewise sine function to model the OH flux curves. Although such a function offers a model which accounts for the asymmetry observed, we propose a new and simpler expectation function which reproduces the observed asymmetry naturally. This expectation function is also more reliable and easier to implement in a nonlinear least squares procedure. This model is applied to four cool variable stars which have been monitored for a period of roughly two years in the 1612 and 1667MHz lines of the OH radical.

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