HST VI photometry of 3 globulars in M31 (Fuentes-Carrera+, 2008)

Details HST VI photometry of 3 globulars in M31 (Fuentes-Carrera+, 2008) HST VI photometry of 3 globulars in M31 (Fuentes-Carrera+, 2008)

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ycat..34830769f&link_type=abstract

VizieR On-line Data Catalog: J/A+A/483/769. Originally published in: 2008A&A...483..769F

Physics

Galaxies: Nearby, Clusters: Globular, Photometry: Hst

Scientific paper

The Tables present the individual photometric measurements of stars in the field of view of the globular clusters G78 (table2a.dat), G213 (table2b.dat) and G280 (table2c.dat) in M31. Observations of the three clusters and their surrounding fields were done with the High Resolution Channel (HRC) of the Advanced Camera for Surveys (ACS) aboard HST. Four images of each globular cluster were taken using the F606W (close to V) and F814W (close to I) filters with total integration time of 505x4=2020s and 715x4=2860s, respectively. Images were dithered following the four-point dither pattern known as ACS-HRC-DITHER-BOX. The instrumental signature was removed from these images (bias, dark and flat-field correction) by the on-the-fly-reprocessing (OTFR) performed by CALACS. Images were corrected for geometric distortion and combined using the MultiDrizzle task of the STSci pipeline incorporated in PyRAF (Koekemoer et al., 2002, The 2002 HST Calibration Workshop, p.337 (2002hstc.conf..337K)).
Photometry was extracted using the DAOPHOT/ALLSTAR routines (Stetson 1994PASP..106..250S). Point-spread functions (PSFs) were constructed with DAOPHOT and stars were measured using the ALLSTAR routine. A detailed description of the procedure is presented in the paper.
In order to derive the color-magnitude diagrams (CMD) of each cluster, stars were statistically selected according to their photometric error, chi-square and sharpness values in order to get rid of spurious photometric detections that might contaminate the results. Remaining stars are indicated in the Tables with a "selection FLAG' value equal to 1. All values are in instrumental magnitudes.
(3 data files).

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