Physics – Optics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5676d&link_type=abstract
HST Proposal ID #5676
Physics
Optics
Hst Proposal Id #5676 Interstellar Medium Sn &Amp, Snr
Scientific paper
The Crab Nebula is the most observable SNR that is composed mainly of processed ejecta rather than swept-up interstellar matter. This makes it one of the most critical of all astronomical objects for SN and nucleosynthesis theory. However, despite its fame, the Crab is NOT understood and does not yet give much support to stellar evolution and nucleosynthesis theory. A shortage of nitrogen is particularly troubling, among other unresolved puzzles. Meanwhile, chemical abundance variations and correlations with bipolar structure have recently become interesting with reference to other objects (e.g. SN1987A). ...These problems absolutely require UV observations of the Crab which can be done only with HST. UV spectra with FOS are most obviously needed, mainly to obtain C, N, Mg, and Si abundances. UV images with FOC are also highly desirable, in case there are surprises such as (e.g.) carbon-rich UV-bright condensations. No such data will have been obtained yet by the end of HST Cycle 2 -- not even a brief reconnaissance. Here we propose a suitable program of exploratory FOC and especially FOS observations. These observations are appropriate for Cycle 3 (i.e., before COSTAR) because their spatial resolution is limited by S/N, not by telescope optics.
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