Assigned ID: 19 ----- Attempting Submission 1 (Tue Feb 15 16:34:36 GMT 2011) ----- HST Phase I Proposal 19 (cygloop.apt) successfully submitted. The warnings about inefficient FPPOS order do not seem to make sense, but if they do the impact is very minor. At one point there were warnings about integrations long enough for orbital motion to smear the spectral response. Give Given the expected resolution and S/N, that will be negligible. ----- Attempting Submission 1 (Fri Jul 01 15:14:47 GMT 2011) ----- The FP-POS order increases from 1 to 4, and according to the documentation that is the efficient order. Even if it is not the most efficient, the cost would be small. The target is extended and faint, so the normal target acquistion procedure would not work. Dust Destruction in the ISM: The Cygnus Loop Blast Wave Interstellar dust is destroyed in supernova remnant shocks, but the destruction rate is poorly known. Model-dependent constraints can be obtained from IR observations with Spitzer and from X-ray images, since liberation of volatiles from grains increases the X-ray emissivity. We propose to obtain a more direct, model independent measurement by using COS to observe emission in the C IV lines from carbon sputtered from grains as it is ionized toward equilibrium at X-ray emitting temperatures. We have chosen a shock wave in the Cygnus Loop where we have dust parameters from Spitzer, the electron temperature from Chandra, and shock speed and density from optical and FUSE spectra. The dust destruction zone is spatially resolved, and we have developed models for the evolution of Spitzer and Chandra spectra as grains are destroyed and refractory elements are returned to the gas phase. The UV sensitivity of COS makes this observation possible.
The program will observe three positions in the Cygnus Loop supernova remnant at and behind the shock wave. The COS 160M grating will be used to measure the fluxes of the C IV 1550 doublet and the He II 1640 line to determine the rate of sputtering of carbon atoms from dust grains swept up by the shock. This will be compared with X-ray and IR observations and models of the sputtering rate and grain size distribution. The positions are at the shock (1 orbit), 10" behind it (3 orbits) and 25" behind it (5 orbits). Depending on shock wave physics, it may be possible to measure the C IV line width as well as the intensity. No special orientation is required. Proper motion was taken into account when choosing the positions, and the proper motion over the course of a year of 0.1" is small enough that fine adjustment for the time of year is not necessary. ISM AND CIRCUMSTELLAR MATTER 12 false 0.0 0.0 false false false false SUPPORTED ISM SNR 1 orbit J2000 J2000 3.8e-15 erg/(cm2 s square arcsec) in C IV 1550 Doublet ISM SNR J2000 J2000 2.9e-16 ergs/(cm2 s square arcsec) in C IV 1550 doublet ISM SNR J2000 J2000 9.0e-17 ergs/(cm2 s square arcsec) in C IV 1550 doublet COS/FUV Spectroscopic No No G160M 1577 COS/FUV Spectroscopic No No G160M 1577 COS/FUV Spectroscopic No No G160M 1577 /home/raymond/prop/HST19/OP-cache/cygloop19_revised-v01.xml The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. Targets 1 and 2 (Tic-Visit :proposal-id 12545 :visit-id "01" :proposal-version -1 :trans-version "20110509" :date "28-Jun-2011 16:53:04.0" :trans-errors '(:WARNINGS 3 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 1531136 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12545 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12545 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2923 :al-overhead-at-end 0 :internal-dur-at-end 50 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12545 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3021 :al-overhead-at-end 0 :internal-dur-at-end 50 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12545 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3021 :al-overhead-at-end 0 :internal-dur-at-end 50 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12545 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3021 :al-overhead-at-end 0 :internal-dur-at-end 362 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) true 4 0 /home/raymond/prop/HST19/OP-cache/cygloop19_revised-v02.xml The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12545 :visit-id "02" :proposal-version -1 :trans-version "20110509" :date "28-Jun-2011 16:53:09.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 730816 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12545 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12545 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2866 :al-overhead-at-end 0 :internal-dur-at-end 40 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12545 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2964 :al-overhead-at-end 0 :internal-dur-at-end 40 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12545 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2964 :al-overhead-at-end 0 :internal-dur-at-end 40 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12545 :visit-id "02" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2964 :al-overhead-at-end 0 :internal-dur-at-end 40 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12545 :visit-id "02" :orbit-number 5 :pcs-time 222 :si-vis-utilization 2921 :al-overhead-at-end 0 :internal-dur-at-end 362 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) true 5 0