Other
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10294l&link_type=abstract
HST Proposal ID #10294
Other
Hst Proposal Id #10294 Ism
Scientific paper
We propose to astrometrically register and co-add the complete archive of WFPC2 PC-chip imaging centered on SN 1987A, creating a "SN 1987A Deep Field." These data span 16 epochs between 1994 Feb and 2002 May in six broad-, one medium- and three narrow-band filters with total exposure times ranging from 1.3-11.4 hours. This dataset will be used to: 1} map out the faintest line-emitting structures in the photoionized bipolar circumstellar nebula surrounding SN 1987A, 2} generate fading lightcurves and [OIII]/{H-alpha+[NII]} line emission maps of the various component substructures of this nebula, 3} establish a highly-accurate astrometric grid of stars within 20 arcseconds of SN 1987A, 4} generate very deep {m 25.5-26.5} broad-band photometry of these same LMC field stars, and 5} identify any variable stellar sources in the field. Additionally, we would seek to register and stack the surrounding WF chip images, extending the stellar and ISM field out to 2 arcminute radius. Once we have accomplished our goals we will make these images publically available. Further science that would be available from these publicly-released deep field images includes: 1} a deep map of LMC interstellar line emission unrelated to SN 1987A, which can be correlated with other imaging and spectroscopic datasets, 2} a small, but deeper, set of stellar photometry than currently exists in this field from which stellar population, IMF and extinction studies can be done, and 3} a sample of variable stars and other stellar types potentially useful as distance estimators.
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