HST/ACS color-magnitude diagrams of candidate intermediate-age M 31 globular clusters. The role of blue horizontal branches.

Details HST/ACS color-magnitude diagrams of candidate intermediate-age M 31 globular clusters. The role of blue horizontal branches. HST/ACS color-magnitude diagrams of candidate intermediate-age M 31 globular clusters. The role of blue horizontal branches.

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ycat..35319155p&link_type=abstract

VizieR On-line Data Catalog: J/A+A/531/A155. Originally published in: 2011A&A...531A.155P

Physics

Galaxies: Nearby, Clusters: Globular, Photometry: Hst

Scientific paper

Tables b058.dat, b292_531.dat, b350.dat, b336.dat, b337.dat present the photometry of the individual stars of six M31 globular clusters. The observations were carried out with the ACS on board of the HST, employing the WFC+F435W/F606W filters. The data reduction has been performed using the ACS module of DOLPHOT, a point spread function-fitting package specifically devoted to the photometry of HST data, that provides as output the magnitudes and the pixel positions of the detected sources, and a number of quality parameters for a suitable sample selection. The tables present, for the chip holding the cluster, all the stars with valid measurements in both passbands, global quality flag=1, crowding parameter <0.5, chi-square parameter <2.5 and sharpness parameter between -0.3 and 0.3. The x,y coordinates, the magnitudes in the Vegamag system, the errors on the magnitudes and the ACS_WFC chip number are listed for each of the selected stars.
(6 data files).

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