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Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8116h&link_type=abstract
HST Proposal ID #8116
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Hst Proposal Id #8116 Stellar Ejecta
Scientific paper
BD +30^degrees3639 is one of the most important and extensively observed of all planetary nebulae. One of the few PNe with X-ray emission from the shocked stellar wind, it is an approved AXAF target. ISO observations led to the unexpected discovery of crystalline silicates in this carbon- rich nebula. This, and other evidence, shows that BD+30 has undergone rapid chemical evolution, and is likely to show abundance anomalies and gradients in the ionized gas. We propose to obtain several long-slit near-UV and optical spectra of BD+30. This will enable us to map the C/O ratio with high spatial resolution { 0.2"}. We will also obtain co- spatial determinations of the temperature and density, map the behavior of the enigmatic C II 4267 recombination line, and perhaps track the Si/C ratio. We propose 2nd-epoch observations to our earlier {1994} WFPC2 images to measure the angular expansion. To map the velocity field of BD+30 - crucial to get its distance from the angular expans ion - we will take echelle spectr a in the C II Lambda2326 line. Such detailed mapping is necessary in light of the discovery of high-velocity outflows, not only in molecular gas {CO, H_2}, but even optical lines. These observations will complete a comprehensive picture of a PN which can open a window onto the final dredge-up and mass-loss phase of AGB evolution.
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