Photometric Transformations

Details Photometric Transformations Photometric Transformations

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9666g&link_type=abstract

HST Proposal ID #9666

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Hst Proposal Id #9666

Scientific paper

The ACS filters provide sufficient variety that transformations to several standard systems can in principle be obtained with proper calibrations. Specifically ACS includes for the first time on HST a full set of Sloan Digital Sky Survey filters, and these are used in about one-third of the overall science program. Although a separate program, ACS SDSS Primary Standard Photometry, will obtain calibrations using the fundamental Sloan standard {and for which the STIS Cycle 11 Cal program will obtain spectra}, observations of rich stars fields containing a variety of stars at different colors are needed to establish photometric transforms including color terms. In addition to the Sloan filters, ACS contains analogues of the primary WFPC2 filters in the optical, and subsets of these can be usefully transformed to the Johnson-Cousins system which is advantageous for many science applications.

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