摘要
安装于云南天文台 1米反光镜上的新Tek 1 0 2 4× 1 0 2 4CCD相机是很好的系统 ,它的某些性能已在文 [1 ],[2 ],[3]中报导。自 1 998年 7月起此相机的有关机械部分已重做 ,并且CCD芯片也被另一片类似的Tek 1 0 2 4× 1 0 2 4代替。但原来的滤光片末换 ,不幸 ,这些玻璃滤光片都已霉变。霉菌侵入玻璃内部 ,使滤光片难以复原 ,企图用平场来改正这种影响不能成功。在这段时期内 ,所有使用了这些滤光片的测光都有可能受影响。当更换了B滤光片后 ,B星等已正常。其它滤光片也在准备更换中。
The new Tek 1024×1024 CCD camera installed on the Zeiss 1 meter reflector of Yunnan Observatory is a good system. Some properties of this camera have been reported by us recently (Yao et.al. 1997,1998). The mechanical part of the camera was re built and the CCD chip replaced by another similar Tek 1024×1024 chip, since July of 1998. However, the filters used originally are not changed. Unfortunately, the glass filters become mould. The mould has already intruded into the inside of the glass, that can not be recovered. our attempt failed to get rid of the influence of the mould by flat fielding. Evidences are given in this paper. We are afraid that all the photometry carried out during this period might suffer from this trouble.
