Observations of Orion with the Nobeyama 45 m telescope

Ken'ichi Tatematsu  (NAOJ)

We started our study of Orion with a survey of the Orion A cloud in CS (1-0) and 13CO (1-0). On the basis of the core catalog from this survey, we studied the chemical evolution of Orion cores by observing the CCS and N2H+ emission.  Then, we employed the deuterium fraction of DNC and N2D+ to evaluate the chemical evolutionary state of Orion cores, and developed the Chemical Evolution Factor. Finally, I like to introduce our new observational results toward Orion using DNC and DCO+ using our new receiver 7BEE.