Faint Photometric Standard Fields for HST

Details Faint Photometric Standard Fields for HST Faint Photometric Standard Fields for HST

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..363w&link_type=abstract

NOAO Proposal ID #2000B-0363

Physics

Scientific paper

Some of the most important projects with the most expensive telescope ever built - HST - are hostage to the uncertainty in the absolute calibration of its photometric system. The standard practice in the past has been to calibrate faint objects observed with long exposures against bright stars observed with very short exposures. There is now good evidence that this is the main cause of uncertainty in the absolute photometric accuracy of WFPC2 on HST. PBS is about to submit a paper describing > 15,000 new photometric standard stars in the BVRI system, reaching as faint as V=22. We propose to use the Mini-Mosaic Imager on the WIYN telescope to transfer this photometric system to carefully chosen fields that have already been observed with WFPC2. This will allow us to retroactively recover the history of the absolute calibration of WFPC2 throughout its mission , and hence improve the available photometric accuracy for all WFPC2 observations. Future HST observations of the new fields would allow us to follow WFPC2's absolute calibration to the end of its mission, and could later serve as the basis for calibrating ACS and WFPC3. This will greatly reduce the error budgets for a wide variety of fundamental projects (e.g., extragalactic Cepheids and RR Lyrae stars; supernovae; globular-cluster ages; distance and metallicity estimates from colors and magnitudes of red giant branch tips).

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