Abstract
OH17.7-2.0 is a typical POST-AGB star. We have observed the circumstellar OH maser radiation of OH17.7-2.0 using Parkes 64m radiotelescope, Australia. We have obtained four peaks in its spectra: the both peaks are from weaker-sources found in our observation run, and the other two are from the stronger-source observed previously. We used a two-dimensional Gaussian fitting procedure to obtain best-fitting positions for each of the four OH peaks. The best-fitting positions show that the position of the stronger OH maser source is clearly consistent with that of a IRAS point source. According to the best-fitting positions the characters of the both weaker-sources have been analysed. Meanwhile the time variation of the weaker-source has been studied.
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