Note the PI will be traveling 17-20 May and away from email. Summer phone number: 713-254-1476 (until 20 August) Summer address: Reginald J. Dufour 55969 Tom Smith Rd. Bandon, OR 97411 ----- Submission 1 (Sun May 14 12:32:38 GMT 2006) ----- Assigned ID: 562 ----- Submission 1 (Fri Jan 27 23:42:35 GMT 2006) ----- Phase I Proposal 562 (cy15final) successfully submitted. ----- Submission 2 (Sat Jan 28 00:26:53 GMT 2006) ----- ----- Submission 3 (Sat Jan 28 20:41:26 GMT 2006) ----- CIII] Imagery of Planetary Nebulae We propose to image five planetary nebulae (PNe) with the F185W filter of WFPC2 in order to study the spatial distribution of the ultraviolet C III] 1909 Angstrom line relative to [O III] 5007 Angstrom and other optical lines. This program follows a Cycle 12 SNAP program (GO 9740) of WFPC2 F185W imaging of PNe and H II regions which validated the feasibility of obtaining images of bright PNe in C III] through careful continuum subtraction and calibrations based on archival IUE SWP and LWP/R spectra. However, in the SNAP program only short (10 minute) exposures of four PNe were taken; we now propose much longer exposures (60-72 minutes) to obtain the desired signal-to-noise to develop high quality C++ ionization maps for comparison with O++ and other ions via photoionization modeling. The five PNe chosen: NGC 2392, NGC 3242, NGC 6543, NGC 6720, and NGC 7662 were selected on the basis of their high surface brightness, extensive UV spectra available from IUE and HST, and numerous WFPC2 images in the archives in other emission lines. We expect the results of this study to impact the utility and accuracy of using the C III] 1909 lines compared to [O III] 5007 for C/O abundance derivations in PNe and H II regions.
The observations consist of long WFPC2 exposures of five planetary nebulae (PNe) centered in the WF3 CCD (WF3-FIX) through the F185W (for the UV CIII] 1909 Ang line + continuum) filter and shorter (3 x 60 sec) exposures with the F547M (continuum) filter. The project has been granted 11 orbits (despite a typo in the front pages of the original APT submission. Thanks to the PC, Shelly Meyett, for clearing this matter up with the time allocation powers at STScI! For NGC 2392, NGC 3242, and NGC 7662, visibility lenghts over two orbits permit three 60 sec F547M exposures and 900+800 sec F185W exposures in the first orbit, followed by two 1200 sec exposures in the second orbit. For NGC 6543, slightly longer visibility orbits permit two 900 sec F185W exposures in the first orbit and two 1300 sec exposures in the second orbit. For NGC 6720, which has a lower surface brightness, three orbits are allocated, with exposures as per the three PNe in the first group over the first two orbits, plus a duplication of the second orbit F185W (1200 + 1200 sec) exposures in the third orbit. No special requirements are made, "point and shoot!" RJD 5/12/2006 None None ISM AND CIRCUMSTELLAR MATTER 12 false 0.0 false false false false false SUPPORTED ISM PLANETARY NEBULA Updated 5/11/06 RJD F(1909+cont)=2.0E-13 ergs cm-2 sec-1 arcsec-1 J2000 00 00 0.0000 +00 00 0.00 J2000 ISM PLANETARY NEBULA Updated 5/11/06 RJD F(1909+cont)=2.5E-13 ergs sec-1 cm-2 arcsec-2 J2000 10 24 46.1100 -18 38 32.60 J2000 ISM PLANETARY NEBULA Updated 5/11/06 RJD F(1909+cont)=1.5E-13 ergs sec-1 cm-2 arcsec-2 J2000 17 58 33.4200 +66 37 59.50 J2000 ISM PLANETARY NEBULA Updated 5/11/06 RJD F(1909+cont)=2.8E-14 ergs sec-1 cm-2 arcsec-2 J2000 18 53 35.0800 +33 01 45.00 J2000 ISM PLANETARY NEBULA Udated 5/11/06 RJD F(1909+cont)=1.3E-13 ergs sec-1 cm-2 arcsec-2 J2000 23 25 54.0000 +42 32 6.03 J2000 WFPC2 Imaging No F185W WFPC2 Imaging No F547M WFPC2 Imaging No F185W WFPC2 Imaging No F547M WFPC2 Imaging No F185W WFPC2 Imaging No F547M WFPC2 Imaging No F185W WFPC2 Imaging No F547M WFPC2 Imaging No F185W WFPC2 Imaging No F547M 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