Extinction Map Of Baade's Window

Recently Wo'zniak & Stanek (1996) proposed a new method to investigate interstellar extinction, based on two band photometry, which uses red clump stars as a means to construct the reddening curve. I apply this method to the color-magnitude diagrams obtained by the Optical Gravitational Lensing Experiment (OGLE) to construct an extinction map of (40 0 ) 2 region of Baade's Window, with resolution of ¸ 30 arcsec. Such a map should be useful for studies of this frequently observed region of the Galactic bulge. The map and software useful for its applications are available via anonymous ftp. The total extinction A V varies from 1:26 mag to 2:79 mag within the (40 0 ) 2 field of view centered on (ff 2000 ; ffi 2000 ) = (18:03:20.9,--30:02:06), i.e. (l; b) = (1:001; \Gamma3:885). The ratio A V =E(V \Gamma I) = 2:49 \Sigma 0:02 is determined with this new method. Subject headings: Galaxy: general -- stars: Hertzsprung-Russell diagram -- stars: statistics 1. INTRODUCTION The Optical..