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P. Zhao, J. E. Grindlay, P. Edmonds, M. R. Garcia, J. E. McClintock, S. S. Murray (CfA), A. Cool (SFSU)
Chandra X-ray Observatory has unprecedented spatial resolution and sensitivity. Its 0.5 arcsec on-axis PSF provides for the first time an angular resolution comparable to ground based optical telescopes. Thus the serendipitous sources in each Chandra field constitute a rich collection of previously unknown X-ray sources with precise positions. The Chandra Multiwavelength Plane (ChaMPlane) Survey is a project to identify a large sample of these serendipitous X-ray sources in the galactic plane, including cataclysmic variables, quiescent low mass x-ray binaries, Be X-ray binaries and stellar coronal sources (see our paper ``ChaMPlane: Measuring the Faint X-ray Binary and Stellar X-ray Content of the Galaxy'' in this meeting). A pilot survey of this project has been successfully conducted in clear weather at the CTIO 4m in March, 2000 with the newly installed MOSAIC-II CCD detector. Nine Chandra cycle-1 fields were observed. Photometry down to 24th R magnitude in the galactic plane was performed in the V, R, I and H\alpha bands. X-ray sources are identified by their H\alpha excess in the R vs. (H\alpha - R) diagram. We will show the preliminary results comparing with the available Chandra X-ray images, including the field of the X-ray nova A0620-00 which has already been observed with Chandra.