Assigned ID: 384 ----- Attempting Submission 1 (Fri Feb 25 15:40:06 GMT 2011) ----- Please check schedulability. I can tolerate some reduction in visibility interval if necessary to schedule both SAA avoidence (due to continuous STIS orbits) and as much exposure time per orbit (for time series). ----- Attempting Submission 1 (Wed Jun 29 17:04:46 GMT 2011) ----- Time series analyses of stellar wind lines are a primary tool for determining the nature and origin of structure in stellar winds. They have provided considerable insight into OB star winds and a recent analysis of a fragmentary FUSE time series demonstrated the presence of apparently similar variability in CSPNe winds. Building on these FUSE results, we request 5 STIS orbits to follow the wind variability in the CSPNe NGC6543. The new data will allow us to verify whether the 4.1 hour time scale inferred from the FUSEdata is related to the rotation period of the star, and we will use wind lines from excited states, available in the STIS band, to determine whether the origin of the wind structure is rooted in the stellar photosphere. If true, this result would be at odds with currently accepted theories for the formation of CSPNe and would suggest a sub-surface convection zone as the origin of the wind activity. All of this is possible in just 5 contiguous STIS orbits because, while the wind in NGC6543 has the same terminal velocity as a typical OB star, it is 20-30 times smaller, resulting in a correspondingly smaller wind flushing time and rotation period.

We intend to obtain a time series of short STIS E140M spectra of the central star of NGC6543 for 5 continuous orbits with a minimal amount of occultation. HOT STARS 12 false 0.0 0.0 false false false false SUPPORTED STAR PLANETARY NEBULA CENTRAL STAR This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 STIS/FUV-MAMA Spectroscopic No No E140M 1425 1309361214454 /Users/massa/emachines/latex/proposals/hst/hst11/OP-cache/12489_ph2-v01.xml 4550 The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12489 :visit-id "01" :proposal-version -1 :trans-version "20110509" :date "29-Jun-2011 11:26:46.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 6750160 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12489 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12489 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 4211 :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 4550.0 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12489 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 4103 :al-overhead-at-end 81 :internal-dur-at-end 134 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 4550.0 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12489 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 4307 :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 4550.0 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12489 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 4324 :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 4550.0 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12489 :visit-id "01" :orbit-number 5 :pcs-time 222 :si-vis-utilization 4307 :al-overhead-at-end 0 :internal-dur-at-end 452 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 4550.0 :pcs-gap 0 ) true 5 0