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Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9898o&link_type=abstract
HST Proposal ID #9898
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Hst Proposal Id #9898 Ism And Circumstellar Matter
Scientific paper
The emission line filter set for the ACS is seriously compromised because the Halpha and the primary [N II] lines are transmitted equally well by the F658N filter. This prevents an absolute calibration of these images with only a single filter, because one doesn't know the intrinsic ratio of these two lines. Absolute calibration is possible if one also makes observations in the [N II] dominated F660N filter and the calibration constants are known. This proposal describes a program that will allow determination of the calibration constants for the three emission line filters and how the observations can be corrected for continuum radiation passed through the same filters. The method was developed originally for WFPC2 and successfully applied there. The well calibrated Orion Nebula will be used as a reference source. Coordinate parallel observations of previously unobserved regions of the Orion Nebula and M 43 will be possible and these will be used to continue discovery of proplyds and other phenomena related to young stellar objects.
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