Max Mutchler said he will take a look to insure that the dither patter is OK. ----- Attempting Submission 1 (Thu Jun 12 19:19:01 GMT 2008) ----- Assigned ID: 834 ----- Attempting Submission 1 (Sat Mar 08 00:14:23 GMT 2008) ----- Phase I Proposal 834 (10790.apt) successfully submitted. Planetary Nebulae, Globular Clusters and Binary Mergers Four planetary nebulae (PNe) have been found within 130 of the 150 globular clusters (GCs) of our Galaxy. This might not seem like many, but stellar evolution predicts that the old populations of these clusters should contain no PN at all! Observations of three of the four GC PNe show them to have peculiar characteristics, possibly indicative of a binary/merger origin. In particular two of the three observed GC PNe have masses which correspond to main sequence masses ~2-3 times the clusters' turn-off masses, sugesting mergers of two, or even three stars have taken place. One of the three observed PNe is H-deficient, a characteristic exhibited by only 5 out of hundreds of field PNe. H-deficient PNe have been associated with binarity. As usual, not all parameters for these three PNe are clean indications of their binary origin. In an approved cycle 15 ACS/WFI proposal we asked to obtain observations of the only GC PN that has never been observed before at high resolution and whose central star has never been detected, as well as of the one H-deficient GC PN for which only low-quality WFPC2 images exist. When ACS stopped working we moved part of the observations to WFPC2. With this proposal we ask to complete our project, by obtaining two ACS/WFI images that could not be efficiently taken with WFPC2. These objects could tip the balance toward a binary interpretation for the GC PNe or make us seriously reconsider our understanding of stellar evolution in old populations.
We will aquire ACS/WFI observations in the [OIII] filter (F502N) of the PNs JaFu1 and IRAS18333-2357. For JaFu1 (one orbit, one visit) we will use a 3-point dither pattern (796s x 3). For IRAS18333 we will use 2 orbits and a 4-point dither pattern, where 2 pointings will be taken in each orbit (441s x 2, 2322s, 2102s). We will center our objects on the WFC1 to insure that we do not end up in the gap between the two chips. A few changes were made to Phase II compared to what was proposed in Phase I. These have all been pre-approved. They are: a switch from HRC to WFI for the entire program. ISM AND CIRCUMSTELLAR MATTER 12 false 0.0 0.0 false false false false false SUPPORTED ISM PLANETARY NEBULA EJECTA EMISSION LINE NEBULA This object was generated by the targetselector and retrieved from the SIMBAD database. [OIII]=5.8e-15 erg/s/cm2/asec2 (observed) J2000 17 43 57.3800 -26 11 54.00 J2000 ISM PLANETARY NEBULA EJECTA EMISSION LINE NEBULA [OIII]=2.8e-15 erg/s/cm2/asec2 (observed) J2000 18 36 22.8200 -23 55 18.30 J2000 ACS/WFC Imaging No No F502N ACS/WFC Imaging No No F502N POS-TARG DITHER 3.0 LINE false false 3 85.28 ACS-WFC-DITHER-LINE 1 false POS-TARG DITHER 3.0 LINE false false 4 85.28 ACS-WFC-DITHER-LINE 2 false The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /Users/orsola/Work/Proposals/2008_HST_GCPN/OP-cache/GO11558-PhaseII-v01.xml (Tic-Visit :proposal-id 11558 :visit-id "01" :proposal-version -1 :trans-version "20080515" :date "12-Jun-2008 15:15:49.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11558 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11558 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2925 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11558 :visit-id "01" :orbit-number 2 :pcs-time 195 :si-vis-utilization 3063 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /private/tmp/OPVisit33970.xml (Tic-Visit :proposal-id 11558 :visit-id "02" :proposal-version -1 :trans-version "20080515" :date "12-Jun-2008 15:18:39.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 852672 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11558 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11558 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2932 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3267 :pcs-gap 0 ) true 1 0