Astronomy and Astrophysics, volume 544A, 155-155 (2012/8-1)
The horizontal branch luminosity vs. metallicity in M31 globular clusters.
FEDERICI L., CACCIARI C., BELLAZZINI M., FUSI PECCI F., GALLETI S. and PERINA S.
Abstract (from CDS):
Thanks to the outstanding capabilites of the HST, our current knowledge about the M31 globular clusters (GCs) is similar to our knowledge of the Milky Way GCs in the 1960s-1970s, which set the basis for studying the halo and galaxy formation using these objects as tracers, and established their importance in defining the cosmic distance scale. We intend to derive a new calibration of the MV(HB)-[Fe/H] relation by exploiting the large photometric database of old GCs in M31 in the HST archive. We collected the BVI data for 48 old GCs in M31 and analysed them by applying the same methods and procedures to all objects. We obtained a set of homogeneous colour-magnitude diagrams (CMDs) that were best-fitted with the fiducial CMD ridge lines of selected Milky Way template GCs. Reddening, metallicity, horizontal branch (HB) luminosity and distance were determined self-consistently for each cluster. There are three main results of this study: i) the relation MV(HB)=0.25(±0.02)[Fe/H]+0.89(±0.03), which is obtained from the above parameters and is calibrated on the distances of the template Galactic GCs; ii) the distance modulus to M31 of (m-M)0=24.42±0.06mag, obtained by normalising this relation at the reference value of [Fe/H]=-1.5 to a similar relation using V0(HB). This is the first determination of the distance to M31 based on the characteristics of its GC system, which is calibrated on Galactic GCs, iii) the distance to the Large Magellanic Cloud (LMC), which is estimated to be 18.54±0.07mag as a consequence of the previous results. These values agree excellently with the most recent estimate based on HST parallaxes of Galactic Cepheid and RR Lyrae stars, as well as with recent methods.
galaxies: individual: M31 - galaxies: star clusters: general - catalogs - Local Group - techniques: photometric
VizieR on-line data:
<Available at CDS (J/A+A/544/A155): clusters.dat g58.dat g219.dat g108.dat g105.dat b468.dat g1.dat g351.dat g64.dat g87.dat g119.dat g287.dat g302.dat g11.dat g33.dat g76.dat g312.dat g319.dat g322.dat gc1.dat gc2.dat gc3.dat gc4.dat gc5.dat gc6.dat gc7.dat gc8.dat gc9.dat gc10.dat ec1.dat ec2.dat ec3.dat ec4.dat>
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