高美古2m级望远镜的多模式终端——YFOSC方案

A Proposal for the Muti-mode Instrument YFOSC Attached to the 2m Telescope at the Gaomeigu Station

多模式终端是目前世界上许多大型、先进望远镜配备的终端设备 ,具有功能多、转换方便、节省经费等优点。丽江高美古的 2m级望远镜首先应该配备一架这样的终端—云南天文台暗天体分光仪和照相机 (YFOSC)。本文对该仪器的功能。

The multi-mode instrument means one instrument with several observational functions.The first one in the world-EFOSC was developed by ESO in 1984.It's outstanding advantages hold interest for astronomers and some similar instruments are now commonly used.A proposal for the multi-mode instrument YFOSC (Yunnan Observatory faint object spectrograph and camera) attached to the 2m telescope at the Gaomeigu Station is described,which includes the function requests,the construction,the main parameters,the observational capabilities,and the control system. The first function is focus reducer with 3/f and field view of 10′.The second can be used is a stellar coronagraph with opaque spots of 1″,1.5″,2″,......8″.The polarimeter mode is employed to measure the Stokes parameters.YFOSC offers spectroscopic function with low and moderate resolutions.The detectable magnitudes are estimated for each observational mode.Some parameters and filters are considered.