Galactocentric Distance With the OGLE and Hipparcos Red Clump Stars

Abstract

We compare red clump stars with parallaxes known to better than 10% in the Hipparcos catalog and corrected for the interstellar extinction, with the OGLE red clump stars in Baade's Window also corrected for the interstellar extinction. There are $\sim 600$ and $\sim 10,000$ such stars in the two data sets, respectively. We find empirically that the average I-band magnitude of red clump stars does not depend on their intrinsic color in the range $0.8<(V-I{)}_0<1.4$. The red clump luminosity function is well represented by a gaussian with the peak at $M_{I_0,m}=-0.26$, and the dispersion ${\sigma }_{RC}\approx 0.2$ mag. This allows a single step determination of the distance to the galactic center and gives $R_0=8.4\pm 0.4$ kpc. The number of red clump stars is so large that a formal statistical error is only $\sim 1$. The local stars are relatively blue and have a small color dispersion: $<(V-I)>=1.01,{\sigma }_{(V-I)}=0.08$, while for the bulge stars $<(V-I{)}_0>=1.22,{\sigma }_{(V-I{)}_0}=0.14$. Presumably, the bulge population has a broader range and a higher average metallicity than the local disk population.

revised version re-submitted to the ApJL, 10 pages, 4 figures

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