OH17．7－20的拱星OH脉泽辐射的观测

THE OBSERVATION OF CIRCUMSTELLAR OH MASER RADIATION OF OH 17.7-2.0

本文作者用澳大利亚Ｐａｒｋｅｓ６４ｍ射电望远镜观测了ＯＨ１７．７－２．０的拱星ＯＨ脉泽辐射。在观测中共测得了三个峰，其中一个峰是我们新发现的弱源，两个峰是过去发现的强源。用二维Ｇａｕｓｓｉａｎ拟合我们发现强源位置与一个ＩＲＡＳ点源位置相一致，弱源位置在这个ＩＲＡＳ点源位置的西南方。强源的两个峰的速度位置和峰值流量密度都是比较稳定的。

We have observed the circumstellar OH maser radiation of OH 17.7-2.0 using Parkes 64m radio telescope, Australia. We have obtained three peaks in its spectrum: one is from a weaker-source found in our observation run, and the other two are from stronger-source observed previously. We used a two-dimensional Gaussian fitting procedure to obtain best-fitting positions for each of three 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, whereas that of the weaker one is on the south west of the stronger one. The velocities and peak flux densities of stronger two peaks are relatively stable.