Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.8925p&link_type=abstract
HST Proposal ID #8925
Physics
Hst Proposal Id #8925
Scientific paper
High dynamic range, high spatial resolution coronagraphic imaging of circumstellar nebulosity has come of age with access to HST's stable point spread function and the coronagraphic capabilities of its science instruments. The only instrument with a coronagraphic capabilty available to the GO community in cycle 10, STIS, has a white-light coronagraph. Subtraction of a PSF calibration star has proven to be an effective way of separating the PSF from the nebulosity of scientific interest. Due to STIS's broad bandpass from 0.2-1.0 microns, STIS coronagraphic images have significant color effects, requiring that the PSF calibrator as close in color to the program star as possible. Over the past few years we have been assembling a library of PSF standard stars observed at the most frequently used coronagraphic apertures on a grid of approximately delta {B-V}=0.2. This study aims to fill a gap in the existing library coverage by observing stars with {B-V}=0.37 and {B-V}=0.5.
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