HST-ACS photometry of the isolated dwarf galaxy VV124=UGC 4879 - Detection of the blue horizontal branch and identification of two young star clusters

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Volume 533 (September 2011)

A&A, 533 (2011) A37

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Table 1

Photometric errors from artificial stars experiments.

F814W	σ(F814W_o − F814W_i)	σ(col_o − col_i)^a


20.0^b	0.009	0.006
21.0	0.010	0.009
22.0	0.013	0.014
23.0	0.021	0.024
24.0	0.040(0.045)^c	0.044(0.045)
25.0	0.077(0.085)	0.084(0.087)
26.0	0.153(0.164)	0.175(0.180)
27.0	0.236(0.242)	0.281(0.286)

Notes.

^(a)

col_o = F606W_o − F814W_o; col_i = F606W_i − F814W_i.

^(b)

The reported errors are standard deviations computed for recovered artificial stars having F814W_o within ± 0.5 mag from the value reported in Col. 1.

^(c)

Numbers within parentheses refer to the sample with CRO ≤ 1.0, which is adopted in the analysis of the clusters. All the other values refer to the standard CRO ≤ 0.3 sample. The alternative value is reported only when it differs by more than 0.001 mag from the standard value.

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