Cycle 24 mid-cycle call 22165185 Assigned ID: 1284 ----- Attempting Submission 1 (Fri Sep 30 23:01:41 GMT 2016) ----- Changes in this version: (1) updated acquisition exposure time (2) adjusted exposure times to get equal exposures on the four FP-POS positions (3) slight restriction of the scheduling window to allow us to monitor the target from the ground in the run-up to the HST observations (HST observations to occur after 15-Feb-2017) -1657982152 ----- Attempting Submission 1 (Tue Dec 20 04:35:21 GMT 2016) ----- ----- Attempting Submission 2 (Tue Jan 03 15:34:21 GMT 2017) ----- The Catalina Real Time Transient survey recently observed an optical outburst from a binary long thought to be a contact binary, and therefore not expected to display large outbursts. Optical follow-up observations proved it to be a cataclysmic variable, a white dwarf accreting from a K star. However, with an orbital period of 5h, the Roche radius would be too small to contain a main sequence K star, suggesting that the system has undergone nuclear evolution prior to the onset of mass transfer. We apply for COS spectroscopy to measure the temperature of the white dwarf, the average accretion rate of the binary, as well as the chemical composition of the donor star. We will use COS/G140L to obtain a UV spectrum of this binary to be able to carry out spectral fitting of the white dwarf to determine its temperature, investigate the emission line ratios (e.g. C/N) as a measure of the evolutionary state of the donor star, i.e. the accretion of CNO-processed material and search for photospheric metal lines from the accretor in the spectrum. The exposure time in each orbit is adjusted to get the maximum exposure time on each FP-POS. The binary is eclipsing, so we will use the TIME-TAG mode in case the observations include the eclipse. This is not the primary aim of the observations, so we do not require any special scheduling to observe the eclipse. The orbital period is 5hr, so much longer than the HST orbit. Stellar Physics 12 false false false false false false AVAILABLE STAR DA INTERACTING BINARY NO J2000 J2000 GALEX FUV = 20.13 +/- 0.18 GALEX NUV = 19.65 +/- 0.10 UNIDENTIFIED BLANK FIELD NO This target is a blank piece of sky, which is the bright object safe pointing and is 9.81" away at a PA 64.0 degs from CRTSJ1621+4412. J2000 COS/FUV Spectroscopic No No G140L 1280 1483457473879 The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. Changes in this version: (1) updated acquisition exposure time (2) adjusted exposure times to get equal exposures on the four FP-POS positions (3) slight restriction of the scheduling window to allow us to monitor the target from the ground in the run-up to the HST observations (HST observations to occur after 15-Feb-2017) I am also applying for a Swift UVOT TOO to confirm the UV brightness and check for any UV variability. This should be scheduled in evening local time. Flags need to be cleared during the work day. (Tic-Visit :proposal-id 14893 :visit-id "01" :proposal-version -1 :trans-version "20160601" :date "03-Jan-2017 15:31:12.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 565504 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14893 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14893 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2974 :al-overhead-at-end 0 :internal-dur-at-end 114 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3307 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14893 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3085 :al-overhead-at-end 0 :internal-dur-at-end 114 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3307 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14893 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3085 :al-overhead-at-end 0 :internal-dur-at-end 369 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3307 :pcs-gap 0 ) false 3 0 1483457473879 This visit is for BOP checking the safe target only and should not execute onboard HST. (Tic-Visit :proposal-id 14893 :visit-id "01" :proposal-version -1 :trans-version "20160601" :date "03-Jan-2017 15:31:12.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 565504 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14893 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14893 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2974 :al-overhead-at-end 0 :internal-dur-at-end 114 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3307 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14893 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3085 :al-overhead-at-end 0 :internal-dur-at-end 114 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3307 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14893 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3085 :al-overhead-at-end 0 :internal-dur-at-end 369 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3307 :pcs-gap 0 ) false 3 0 This visit will not execute as it is for BOP checking the safe target. This visit will be withdrawn after the science visit is placed on the calendar. This visit allocates and sets up the safe position offset slot for visit 01 (labeled: Imaging aqn and spectrum), which will use that slot. This S/C visit should go earlier in the week while visit 01 (labeled: Imaging aqn and spectrum) will be at least 3 days later. The S/C visit will contain only 1 exposure. NOTE: Weekends are to be avoided since the CS must clear the target within 24 hours of HST execution. false -1 -1