Erratum: ``Where the Blue Stragglers Roam: Searching for a Link between Formation and Environment'' (ApJ, 661, 210 [2007])

Details Erratum: ``Where the Blue Stragglers Roam: Searching for a Link between Formation and Environment'' (ApJ, 661, 210 [2007]) Erratum: ``Where the Blue Stragglers Roam: Searching for a Link between Formation and Environment'' (ApJ, 661, 210 [2007])

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...678..564l&link_type=abstract

The Astrophysical Journal, Volume 678, Issue 1, pp. 564-566.

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We made an error in our conversion of arcseconds to pixels when calculating the core radii for the WF chips. Using a conversion factor of 0.046" pixel-1 led to an overestimation of the size of the core in pixels by a factor slightly exceeding 2. Here we provide a corrected version of Figure 2, in addition to corrected versions of Tables 1 and 2. The overall trends are unaffected and our figures and Spearman correlation coefficients remain similar.
We also take this opportunity to note that the accuracy of Piotto et al.'s (2002) assumption that each cluster core has been centered on the PC chip proved to be more of a concern when considering these smaller radii, since for clusters with small rc, the core could be offset from the center of the PC chip by more than one core radius. For this erratum, we calculated our own cluster centers by binning the stellar positions on the PC chip, fitting Gaussians to the corresponding histograms in both the x and y directions, and then using the peak of the distributions to extract the cluster centers (specifics available upon request). The pixel coordinates are given such that the lower left corner of the WF3 chip is at (x,y)=(0,0). The center of the PC chip is then at (984, 984), in units of WF chip pixels.
We present the corrected counts of blue stragglers and other populations in Table 2, and present our revised Figure 2 in this erratum. The results from our previous paper remain essentially unchanged.

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