IRAF软件孔径测光参数与测光误差的研究  

Research on Aperture Photometric Parameters and Photometric Errors with IRAF

作　　者：温元斌[1] 郑永刚[1] 周凌云[1] 张雄[1] 

机构地区：[1]云南师范大学物理与电子信息学院,云南昆明650092

出　　处：《昆明理工大学学报（理工版）》2007年第3期44-47,51,共5页Journal of Kunming University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(项目编号:10363002;10663002);云南省自然科学基金资助项目(项目编号:2004A0027M)

摘　　要：CCD测光的标准处理软件是iraf,而在测光中常常要选择不同的测光孔径参数apertur和annulus的值,一般来说它们的值由FWHM来决定,FWHM选取直接影响到测光误差的大小,我们利用了云南天文台1.02m望远镜对BLlac天体Mrk501进行了测光,我们选择不同的apertur和annulus的比值,进行数据处理,获得了R波段apertur与annulus的比值和测光误差的关系.结果表明,当apertur与annulus比值增大时,测光误差增大.annulus的参数值应该大于apertur的参数值,此时测光误差较小.IRAF is the standard software for CCD photometry, and different values for aperture parameters and annulus are often selected in photometry, generally determined by FWHM, which directly influences the photo- metric errors. Accordingly, we have observed the BL Lac Mrk 501 with the 1.02m optical telescope of Yunnan Observatory. Through the ratio among different aperture and annulus, we have obtained the connection between the ratio of aperture and annulus at R wave band and the photometric error. The result indicates that the photo- metric error increases with the increase of the ratio between aperture and annulus, and vice versa. So the parame- ter value of annulus should be greater than that of the aperture when the photometric error is minimal.

关 键 词：CCD测光 光学观测 天文望远镜 

分 类 号：P152[天文地球—天文学]