Using astrometric techniques developed by Anderson et al., we determine proper motions （PMs） in the ~ 14.60 × 16.53 arcmin^2 area of the kinematically ＂thick-disk＂ globular cluster M 12. The cluster＇s proxim...Using astrometric techniques developed by Anderson et al., we determine proper motions （PMs） in the ~ 14.60 × 16.53 arcmin^2 area of the kinematically ＂thick-disk＂ globular cluster M 12. The cluster＇s proximity and sparse nature makes it a suitable target for ground-based telescopes. Archive images with time gap of ~ 11.1 years were observed with the wide-field imager （WFI） mosaic cam-era mounted on the ESO 2.2m telescope. The median value of PM error in both components is 0.7masyr^-1 for the stars having V ≤ 20mag. PMs are used to determine membership probabil-ities and to separate field stars from the cluster sample. In electronic form, a membership catalog of 3725 stars with precise coordinates, PMs and BVRI photometry is being provided. One of the possible applications of the catalog is demonstrated by gathering the membership information of the variable stars, blue stragglers and X-ray sources reported earlier in the cluster＇s region.展开更多
满足IP68防护标准的环保密封设计和超坚固的外壳适合最极端的工业应用；6个10／100 TX自适应速率端口．采用符合iP68防护等级的M12接头；电源接口采用牢固的M12接头；支持Rapid Super Ring（RSR）快速自愈环网专利技术。自愈时间小于5m...满足IP68防护标准的环保密封设计和超坚固的外壳适合最极端的工业应用；6个10／100 TX自适应速率端口．采用符合iP68防护等级的M12接头；电源接口采用牢固的M12接头；支持Rapid Super Ring（RSR）快速自愈环网专利技术。自愈时间小于5ms，无缝恢复（断线复接恢复时间为零）；展开更多
基金supported by grants from the Ministry of Science and Technology(MOST),Taiwan(MOST Nos.103-2112M-007-020-MY3,104-2811-M-007-024,105-2811-M007-038,105-2119-M-007-029-MY3,106-2112-M-007006-MY3 and 106-2811-M-007-051)
文摘Using astrometric techniques developed by Anderson et al., we determine proper motions （PMs） in the ~ 14.60 × 16.53 arcmin^2 area of the kinematically ＂thick-disk＂ globular cluster M 12. The cluster＇s proximity and sparse nature makes it a suitable target for ground-based telescopes. Archive images with time gap of ~ 11.1 years were observed with the wide-field imager （WFI） mosaic cam-era mounted on the ESO 2.2m telescope. The median value of PM error in both components is 0.7masyr^-1 for the stars having V ≤ 20mag. PMs are used to determine membership probabil-ities and to separate field stars from the cluster sample. In electronic form, a membership catalog of 3725 stars with precise coordinates, PMs and BVRI photometry is being provided. One of the possible applications of the catalog is demonstrated by gathering the membership information of the variable stars, blue stragglers and X-ray sources reported earlier in the cluster＇s region.
文摘满足IP68防护标准的环保密封设计和超坚固的外壳适合最极端的工业应用；6个10／100 TX自适应速率端口．采用符合iP68防护等级的M12接头；电源接口采用牢固的M12接头；支持Rapid Super Ring（RSR）快速自愈环网专利技术。自愈时间小于5ms，无缝恢复（断线复接恢复时间为零）；
