Made several changes, in order to place the most favorable part of the nebula in the FOV, to take the two PSF stars close to the times when the Cepheid will have a similar color, and to place RS Pup at the center of the WFC field for Visit 10, rather than at the center of Chip 1 as it was before. ----- Attempting Submission 1 (Tue Jul 22 20:39:25 GMT 2008) ----- ----- Attempting Submission 2 (Fri May 29 20:31:45 GMT 2009) ----- ----- Attempting Submission 3 (Mon Jun 08 17:15:29 GMT 2009) ----- ----- Attempting Submission 4 (Fri Feb 19 22:59:09 GMT 2010) ----- Diagnostics are warnings only, about combining POS TARG with a centered dither pattern. Assigned ID: 668 ----- Attempting Submission 1 (Fri Mar 07 22:32:02 GMT 2008) ----- RS Puppis is one of the most luminous Cepheids in the Milky Way (P = 41.4 days) and an analog of the bright Cepheids used to measure extragalactic distances. An accurate distance would help anchor the zero-point of the bright end of the period-luminosity relation, but at a distance of about 2 kpc it is too far away for a trigonometric parallax with existing instrumentation. RS Pup is unique in being surrounded by a reflection nebula, whose brightness varies as pulses of light from the Cepheid propagate outwards. Members of our team have used ground-based imaging of the nebula to derive phase lags in the light variations of individual features in the nebula, and have inferred a seemingly very precise geometric distance to the star. However, there is an unavoidable ambiguity involving the cycle counts, which was resolved by assuming that the features lie in the plane of the sky. If this assumption is incorrect, a large systematic error would be introduced into the distance measurement. We show that polarimetric imaging using the high spatial resolution of ACS/WFC and its ability to image close to the star can resolve this ambiguity and yield a reliable geometric distance to RS Pup. We will also obtain a wide-field multicolor image of the nebula, in order to study its morphology and the mass-loss history of the Cepheid.

We will obtain polarimetric images of the reflection nebulosity around the Cepheid RS Puppis, using ACS/WFC with F606W and the three polarizers. We use a simple 2-point dither pattern. The 7 polarimetry visits will be spaced at 1/7 of the Cepheid pulsation period of 41.4 days, in order to have an equally spaced sampling of the reflected light curve. We will also obtain similar images of two nearby PSF stars, in order to be able to subtract the wings of the bright Cepheid image from the frames. These 2 stars have been chosen to sample the color range covered by the Cepheid during its pulsation period, and the observations of the blue and red PSF stars will be made close to the times at which the Cepheid is bluest and reddest, respectively. We will devote one orbit to obtaining direct (unpolarized) images in B and V, in order to study the morphology of the nebula. We will place the nebula in the center of the ACS/WFC field of view, and use a 2-point dither to cover the inter-chip gap. COOL STARS 12 false 0.0 1 false false false false false false SUPPORTED STAR CEPHEID CIRCUMSTELLAR MATTER EJECTA F3-F9 HD68860 J2000 08 13 3.6000 -34 35 5.00 J2000 STAR CEPHEID CIRCUMSTELLAR MATTER EJECTA F3-F9 These coordinates are for a location slightly SW of RS Pup itself, where ground-based observations have indicated that the linear polarization is high. HD68860 J2000 08 13 3.6000 -34 35 5.00 J2000 STAR G III-I Coordinates are offset from the star in order to place it at the same field location that will be used for RS Puppis. HD68111 J2000 00 00 0.0000 +00 00 0.00 J2000 STAR K III-I Coordinates are offset from the star in order to place it at the same field location that will be used for RS Puppis. HD71670 J2000 00 00 0.0000 +00 00 0.00 J2000 ACS/WFC Imaging No Yes F606W ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W ACS/WFC Imaging No Yes F606W ACS/WFC Imaging No Yes F606W POS-TARG DITHER 0.364 LINE false true 2 47.23 ACS-WFC-DITHER-LINE 1 false POS-TARG DITHER 3.011 LINE false true 2 85.27 ACS-WFC-DITHER-LINE 2 false Timing link suitability includes constraints ([02 After 01 by 5.8 to 6.1 days] [03 After 01 by 11.7 to 12.0 days] [04 After 01 by 16.6 to 17.9 days] [05 After 01 by 23.5 to 23.8 days] [06 After 01 by 29.4 to 29.8 days] [07 After 01 by 35.4 to 35.7 days] [09 After 01 by at most 4.0 days]) Same orient constraint links visits (01 02 03 04 05 06 07 10) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. 1266617971482 /user/bond/klingsor1/hstcycle17/rspup/OP-cache/11715-v01.xml The BETWEEN requirement is added to ensure that the observations are done in spring 2009 and not at the next opportunity in 2010. (Tic-Visit :proposal-id 11715 :visit-id "01" :proposal-version -1 :trans-version "20091209" :date "19-Feb-2010 17:19:30.0" :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 421472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11715 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11715 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2808 :al-overhead-at-end 0 :internal-dur-at-end 346 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3143 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([02 After 01 by 5.8 to 6.1 days]) Same orient constraint links visits (01 02 03 04 05 06 07 10) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. 1266617955476 /user/bond/klingsor1/hstcycle17/rspup/OP-cache/11715-v02.xml The seven visits are spaced at 1/7 of the 41.44-day Cepheid period, or 5.92 days, with a window 0.33 day wide. (Tic-Visit :proposal-id 11715 :visit-id "02" :proposal-version -1 :trans-version "20091209" :date "19-Feb-2010 17:19:14.0" :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 421472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11715 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11715 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2808 :al-overhead-at-end 0 :internal-dur-at-end 346 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3143 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([03 After 01 by 11.7 to 12.0 days] [08 After 03 by at most 4.0 days]) Same orient constraint links visits (01 02 03 04 05 06 07 10) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. 1266617939685 /user/bond/klingsor1/hstcycle17/rspup/OP-cache/11715-v03.xml The seven visits are spaced at 1/7 of the 41.44-day Cepheid period, or 5.92 days, with a window 0.33 day wide. (Tic-Visit :proposal-id 11715 :visit-id "03" :proposal-version -1 :trans-version "20091209" :date "19-Feb-2010 17:18:59.0" :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 421472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11715 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11715 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2808 :al-overhead-at-end 0 :internal-dur-at-end 346 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3143 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([04 After 01 by 16.6 to 17.9 days]) Same orient constraint links visits (01 02 03 04 05 06 07 10) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. 1266617918790 /user/bond/klingsor1/hstcycle17/rspup/OP-cache/11715-v04.xml The seven visits are spaced at 1/7 of the 41.44-day Cepheid period, or 5.92 days, with a window 0.33 day wide. (Tic-Visit :proposal-id 11715 :visit-id "04" :proposal-version -1 :trans-version "20091209" :date "19-Feb-2010 17:18:38.0" :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 421472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11715 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11715 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2808 :al-overhead-at-end 0 :internal-dur-at-end 346 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3143 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([05 After 01 by 23.5 to 23.8 days]) Same orient constraint links visits (01 02 03 04 05 06 07 10) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. 1266617901190 /user/bond/klingsor1/hstcycle17/rspup/OP-cache/11715-v05.xml The seven visits are spaced at 1/7 of the 41.44-day Cepheid period, or 5.92 days, with a window 0.33 day wide. (Tic-Visit :proposal-id 11715 :visit-id "05" :proposal-version -1 :trans-version "20091209" :date "19-Feb-2010 17:18:20.0" :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 421472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11715 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11715 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2808 :al-overhead-at-end 0 :internal-dur-at-end 346 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3143 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([06 After 01 by 29.4 to 29.8 days]) Same orient constraint links visits (01 02 03 04 05 06 07 10) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. 1266617876850 /user/bond/klingsor1/hstcycle17/rspup/OP-cache/11715-v06.xml The seven visits are spaced at 1/7 of the 41.44-day Cepheid period, or 5.92 days, with a window 0.33 day wide. (Tic-Visit :proposal-id 11715 :visit-id "06" :proposal-version -1 :trans-version "20091209" :date "19-Feb-2010 17:17:56.0" :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 421472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11715 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11715 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2808 :al-overhead-at-end 0 :internal-dur-at-end 346 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3143 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([07 After 01 by 35.4 to 35.7 days]) Same orient constraint links visits (01 02 03 04 05 06 07 10) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. 1266617852234 /user/bond/klingsor1/hstcycle17/rspup/OP-cache/11715-v07.xml The seven visits are spaced at 1/7 of the 41.44-day Cepheid period, or 5.92 days, with a window 0.33 day wide. (Tic-Visit :proposal-id 11715 :visit-id "07" :proposal-version -1 :trans-version "20091209" :date "19-Feb-2010 17:17:31.0" :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 421472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11715 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11715 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2808 :al-overhead-at-end 0 :internal-dur-at-end 346 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3143 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([08 After 03 by at most 4.0 days]) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. 1266617820873 /user/bond/klingsor1/hstcycle17/rspup/OP-cache/11715-v08.xml The AFTER requirement is added to ensure this PSF observation is done in the same timeframe as the Cepheid observations. (Tic-Visit :proposal-id 11715 :visit-id "08" :proposal-version -1 :trans-version "20091209" :date "19-Feb-2010 17:16:59.0" :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 421472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11715 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11715 :visit-id "08" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2814 :al-overhead-at-end 0 :internal-dur-at-end 346 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3152 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([09 After 01 by at most 4.0 days]) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. 1266617802193 /user/bond/klingsor1/hstcycle17/rspup/OP-cache/11715-v09.xml The AFTER requirement is added to ensure this PSF observation is done in the same timeframe as the Cepheid observations. (Tic-Visit :proposal-id 11715 :visit-id "09" :proposal-version -1 :trans-version "20091209" :date "19-Feb-2010 17:16:41.0" :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 421472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11715 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11715 :visit-id "09" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2808 :al-overhead-at-end 0 :internal-dur-at-end 346 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3143 :pcs-gap 0 ) true 1 0 Same orient constraint links visits (01 02 03 04 05 06 07 10) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. 1266619728229 /user/bond/klingsor1/hstcycle17/rspup/OP-cache/11715-v10.xml This is the unpolarized BV image of the RS Pup nebula. (Tic-Visit :proposal-id 11715 :visit-id "10" :proposal-version -1 :trans-version "20091209" :date "19-Feb-2010 17:48:46.0" :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 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11715 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11715 :visit-id "10" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2941 :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 3275 :pcs-gap 0 ) true 1 0