0 ----- Attempting Submission 1 (Tue Apr 09 21:46:51 GMT 2019) ----- Determining the Cooling Curve of the Unique Extreme Amplitude Dwarf Nova V386 Ser Containing an Accreting, Pulsating White Dwarf. V386 Ser is a relatively rare close binary containing a well-studied (at quiescence) accreting, pulsating white dwarf that underwent its first known extreme amplitude dwarf nova outburst in January, 2019, and we request a short COS observation to measure the temperature of the white dwarf as soon as possible after the outburst. Since 2004, it has been pulsating at a period of 609 sec, which is known to be a triplet with a spacing indicating a puzzling extremely slow rotation for an accreting white dwarf. The only other pulsating white dwarf that went into a superoutburst and has been followed up with HST is GW Lib. That data revealed an unusually long and non-monotonic cooling time as well as changing modes of pulsation during its decline. However, the monitoring of GW Lib only started 3 yrs past its outburst. V386 Ser presents the unique opportunity to obtain the optimum measurement of the heating within a few months of the outburst when the accretion disk has dissipated enough to view the white dwarf. Obtaining this measurement in the UV with COS will constrain the cooling curve (hence the amount of accretion that took place) and how possible spinup from this accretion impacts the pulsation structure in the interior versus atmospheric rotation. We will use COS with the G140L grating to obtain time-tag spectra during 2 HST orbits of the pulsating white dwarf in the close binary V386 Ser. In January, 2019, V386 Ser underwent its first dwarf nova outburst since its discovery in 2002. Our goal is to obtain a temperature as soon as possible now that the system has faded back toward quiescence and we can view how much the white dwarf has been heated by the outburst. A quiescent very low resolution spectrum was obtained by HST using the SBC on June 30, 2005 when STIS was out of service ( Program 10233, observation J84E02021). Since we want to cover as much of the Far UV as possible, we will use the new 800 central wavelength. Target acquisition will be done using the ACQ/IMAGE in the NUV. The time-tag data will be used to search for the quiescent pulsation period of 608 sec or longer periods such as those evident in GW Lib after its outburst. The time-tag spectra will also allow removing the orbital motion of the white dwarf in order to obtain the best value for the white dwarf rotation from the Doppler broadened UV absorption lines of Si and C. Because the cooling curve of the white dwarf is best determined if we can observe soon after the white dwarf is visible (the disk has decreased its outburst luminosity), the best observation times would be May-June. This is also the time when the optical can be observed from the ground, allowing the ratio of UV/opt amplitude of any pulsations to be determined, which can determine the mode of pulsation. This is the first outburst since the discovery 19 years ago, so the outburst period is several decades. However, we will determine the precise quiescent optical magnitude within 24 hrs of the HST observation as done in the past for normal dwarf novae. As of March 31, the object is at 17.5 mag, returning to its quiescent value of g=19. Stellar Physics 3 false false true false false false false AVAILABLE STAR DWARF NOVA INTERACTING BINARY PULSATING VARIABLE NO This object was generated by the targetselector and retrieved from the SIMBAD database.This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 UNIDENTIFIED BLANK FIELD NO UNIDENTIFIED BLANK FIELD NO COS/FUV Spectroscopic No No G140L 1105 The scheduling data was generated by CASM 27.0. CASM was run in Phase II mode. 48 /solaris/user1/aroman/work/hst/OP-cache/15703-v01.xml This should be scheduled during the evening - Baltimore time. Offset flags need to be cleared during the work day. The PHASE requirement will enforce this. ORIENT is to avoid the possibility of a nearby object landing near the COS Bright Object Aperture. 1559190735000 190.0 (Tic-Visit :proposal-id 15703 :visit-id "01" :proposal-version -1 :trans-version "20181130" :date "14-May-2019 12:37:51.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 330560 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15703 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15703 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2513 :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 2880.0 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15703 :visit-id "01" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2578 :al-overhead-at-end 0 :internal-dur-at-end 407 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2880.0 :pcs-gap 0 ) false 2 0 /solaris/user1/aroman/work/hst/OP-cache/15703-v02.xml This visit allocates and sets up the safe position offset slot for visit 01 which will use that slot. This S/C visit should go earlier in the week while visit 01 will be at least 3 days later. The PHASE requirement will ensure that the visit is sheduled on a Monday. 1558930169000 190.0 (Tic-Visit :proposal-id 15703 :visit-id "02" :proposal-version -1 :trans-version "20181130" :date "10-Apr-2019 09:35:01.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "11" :si-bright-earth-limb-angle 20.0 :data-volume 0 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15703 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15703 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 5 :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 3142 :pcs-gap 0 ) false 1 0 /solaris/user1/aroman/work/hst/OP-cache/15703-v03.xml This visit is for BOP checking the safe target only and should not execute onboard HST. (Tic-Visit :proposal-id 15703 :visit-id "03" :proposal-version -1 :trans-version "20181130" :date "10-Apr-2019 09:35:02.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 365504 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15703 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15703 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2809 :al-overhead-at-end 0 :internal-dur-at-end 38 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15703 :visit-id "03" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2840 :al-overhead-at-end 0 :internal-dur-at-end 331 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) false 2 0 48 /solaris/user1/aroman/work/hst/OP-cache/15703-v11.xml This should be scheduled during the evening - Baltimore time. Offset flags need to be cleared during the work day. The PHASE requirement will enforce this. ORIENT is to avoid the possibility of a nearby object landing near the COS Bright Object Aperture. (Tic-Visit :proposal-id 15703 :visit-id "01" :proposal-version -1 :trans-version "20181130" :date "14-May-2019 12:37:51.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 330560 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15703 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15703 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2513 :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 2880.0 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15703 :visit-id "01" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2578 :al-overhead-at-end 0 :internal-dur-at-end 407 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2880.0 :pcs-gap 0 ) false 2 0 /solaris/user1/aroman/work/hst/OP-cache/15703-v12.xml This visit allocates and sets up the safe position offset slot for visit 01 which will use that slot. This S/C visit should go earlier in the week while visit 01 will be at least 3 days later. The PHASE requirement will ensure that the visit is scheduled on a Monday. (Tic-Visit :proposal-id 15703 :visit-id "02" :proposal-version -1 :trans-version "20181130" :date "10-Apr-2019 09:35:01.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "11" :si-bright-earth-limb-angle 20.0 :data-volume 0 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15703 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15703 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 5 :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 3142 :pcs-gap 0 ) false 1 0 /solaris/user1/aroman/work/hst/OP-cache/15703-v13.xml This visit is for BOP checking the safe target only and should not execute onboard HST. (Tic-Visit :proposal-id 15703 :visit-id "03" :proposal-version -1 :trans-version "20181130" :date "10-Apr-2019 09:35:02.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 365504 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15703 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15703 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2809 :al-overhead-at-end 0 :internal-dur-at-end 38 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15703 :visit-id "03" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2840 :al-overhead-at-end 0 :internal-dur-at-end 331 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) false 2 0