Description
A proper-motion study of a field of 20'x20' inside Plaut's low-extinction window (l,b) = (0{deg}, -8{deg}) has been completed. Relative proper motions and photographic BV photometry have been derived for ~21000 stars reaching to V~20.5mag, based on the astrometric reduction of 43 photographic plates, spanning over 21yr of epoch difference. Proper-motion errors are typically 1mas/yr, and field-dependent systematics are below 0.2mas/yr. Cross-referencing with the 2MASS catalog yielded a sample of ~8700 stars, from which predominantly disk and bulge subsamples were selected photometrically from the JH color-magnitude diagram. The two samples exhibited different proper-motion distributions, with the disk displaying the expected reflex solar motion as a function of magnitude.
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