The Extinction Toward the Galactic Bulge from RR Lyrae Stars

Details The Extinction Toward the Galactic Bulge from RR Lyrae Stars The Extinction Toward the Galactic Bulge from RR Lyrae Stars

2007-12-03

arxiv.org/abs/0712.0389v1

Astronomy and Astrophysics

Astrophysics

4 Figures, accepted to AJ

Scientific paper

10.1088/0004-6256/135/2/631

We present mean reddenings toward 3525 RR0 Lyrae stars from the Galactic bulge fields of the MACHO Survey. These reddenings are determined using the color at minimum $V$-band light of the RR0 Lyrae stars themselves and are found to be in general agreement with extinction estimates at the same location obtained from other methods. Using 3256 stars located in the Galactic Bulge, we derive the selective extinction coefficient $R_{V,VR}=A_V/E(V-R) = 4.3 \pm 0.2$. This value is what is expected for a standard extinction law with $R_{V,BV} = 3.1 \pm 0.3$.

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