The Distance to the Galactic Center Obtained by Infrared Photometry of RR Lyrae Variables

Details The Distance to the Galactic Center Obtained by Infrared Photometry of RR Lyrae Variables The Distance to the Galactic Center Obtained by Infrared Photometry of RR Lyrae Variables

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.1674c&link_type=abstract

Astronomical Journal v.110, p.1674

Astronomy and Astrophysics

Astronomy

50

Galaxy: Center, Stars: Variables: Rr Lyrae, Galaxy: Structure

Scientific paper

We report K-band photometry of 58 RR Lyraes in the field of Baade's Window (1=1°, b=-3.9°). Using a metallicity- and reddening-insensitive relation between MK and log P for RR Lyraes in this field and in another at l=0°, b=-12° studied by Femley et al. [MNRAS, 226, 927 (1987)], we derive the distance to the galactic center. Using the distance scale of Carney et al. [ApJ, 386, 663 (1992)], we find R0=7.8±0.4 kpc. Adjusting that distance scale's zero point to yield an LMC distance modulus (m-M)0=18.5 mag results in R0=8 S kpc. Including the systematic uncertainties from the two different distance scales results in R0=8.3±1.0 kpc. We discuss some implications for the star formation history in the bulge using the derived distances.

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