The Zero Point of Extinction Toward Baade's Window From RR Lyrae Stars

C. Alcock , R.A. Allsman , D. R. Alves , T.S. Axelrod , A.C. Becker , D.P. Bennett , K.H. Cook , K.C. Freeman

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K. Griest A. Gould J.A. Guern M.J. Lehner S.L. Marshall D. Minniti B.A. Peterson P. Popowski M.R. Pratt P.J. Quinn A.W. Rodgers C.W. Stubbs W. Sutherland T. Vandehei D.L. Welch

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classification 🌌 astro-ph

keywords lyraepointstarszerocolorsextinctionstanekagreement

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We measure the zero point of the Stanek (1996) extinction map by comparing the observed (V-K) colors of 20 RR Lyrae stars (type ab) found in the MACHO survey with their intrinsic (V-K)_0 colors as a function of period as determined from nearby RR Lyrae stars. We find that the zero point of the Stanek map should be changed by \Delta A_V = -0.11 +/- 0.05 mag, in excellent agreement with the recent measurement of Gould, Popowski & Terndrup (1997) using K giants.

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The Zero Point of Extinction Toward Baade's Window From RR Lyrae Stars

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