The Zero Point of Extinction Toward Baade's Window
Andrew Gould, Piotr Popowski, Donald M. Terndrup
Abstract
We measure the zero point of the Stanek (1996) extinction map by comparing the observed (V-K) colors of 206 K giant stars with their intrinsic (V-K)0 colors as derived from their Hβindices. We find that the zero point of the Stanek map should be changed by ΔAV = -0.10 +/- 0.06 mag, obtaining as a bonus a three-fold reduction of the previous statistical error. The most direct way to test for systematic errors in this determination would be to conduct a parallel measurement based on the (V-K) colors of RR Lyraes (type ab).
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