Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop10057j&link_type=abstract
HST Proposal ID #10057
Physics
Hst Proposal Id #10057
Scientific paper
We request 3 orbits to observe a well-calibrated region in the Orion Nebula with the primary goal of deriving monochromatic L-flats at specific central wavelengths {lambda_c} for {a} WFC {inner+outer} Halpha {FR716N, FR782N} and [OIII] {FR551N, FR601N} ramp filters. {b} WFC middle ramp filters {FR388N, FR459M, FR505N, FR6546N, FR914M}.{c} HRC middle ramp filters {FR388N, FR459M, FR505N, FR656N, FR914M}. As a secondary goal, we will get an independent check of the wavelength calibration which will be provided by the IDT team from the Cycle 11 program 9671. We request 1.5 CVZ orbits to observe two well-calibrated standard star fields in 47 Tuc with the primary goal of deriving WFC and HRC continuum L-flats for three middle {WFC1-MRAMP} filters: FR656N, FR388N, and FR505N. These filters are selected as they are frequently used to map the Halpha 6563 A, [OII] 3727A, and [OIII] 5007A lines and they include the least {FR388N} and most {FR505N} uniform ramps, based on ground data {ISR ACS 02-01}. These 3 filters should provide a good baseline for testing our approach and gauging the range of non-uniformity in the continuum L-flats. For good spatial sampling, the 2 fields are selected with stellar densities appropriate to WFC and HRC. For good spectral sampling we will step in the central wavelength in steps of 80 A, with 30s exposure at each lambda_c providing good S/N for V=15-20 mag stars. We will use 2K subarrays to reduce the frequency of buffer dumps.
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