Calibration of the WFPC2 HeII and [SII] Filters.

Details Calibration of the WFPC2 HeII and [SII] Filters. Calibration of the WFPC2 HeII and [SII] Filters.

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11231o&link_type=abstract

HST Proposal ID #11231. Cycle 16

Physics

Scientific paper

Observations of NGC 6720 the Ring Nebula will be used to determine the calibration constants for the important emission-line filters that isolate nebular HeII F469N and [SII] F673N emission. The pre-launch calibrations are inadequate because of possible temporal changes and the fact that these interference filters are used in a different configuration from that of the ground calibration. The Ring Nebula is a nearly ideal reference source as multiple 2.4"x4.0" samples have been accurately measured spectro-photometrically and five of the six samples can be imaged with one pointing of the HST. The method of derivation of the calibration constants will be the same as previously employed to calibrate the primary emission-line filters for the WFPC2 F487N, F502N, F656N, F658N and ACS F502N, F658N, F660N using the Orion Nebula as a reference source. However, Orion cannot be used for this calibration because the targeted lines are weak [SII] or absent HeII and the scattered-light continuum is strong. The Ring Nebula has strong HeII emission in its middle, strong [SII] emission in its main ring, and a weak atomic only continuum.;

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