Assigned ID: 225 ----- Attempting Submission 1 (Thu Feb 24 23:37:49 GMT 2011) ----- HST Phase I Proposal 225 (V1309.apt) successfully submitted. ----- Attempting Submission 2 (Fri Feb 25 22:16:29 GMT 2011) ----- HST Phase I Proposal 225 (V1309Sco2011.apt) successfully submitted. ----- Attempting Submission 3 (Fri Feb 25 23:14:59 GMT 2011) ----- HST Phase I Proposal 225 (V1309Sco2011.apt) successfully submitted. ----- Attempting Submission 4 (Fri Feb 25 23:18:40 GMT 2011) ----- HST Phase I Proposal 225 (V1309Sco2011.apt) successfully submitted. ----- Attempting Submission 5 (Sat Feb 26 01:07:19 GMT 2011) ----- HST Phase I Proposal 225 (V1309Sco2011.apt) successfully submitted. ----- Attempting Submission 1 (Fri Aug 05 20:27:25 GMT 2011) ----- The 2008 eruption of V1309 Sco was recently proved to have resulted from the merger of two nondegenerate stars. Such mergers have long been thought to occur, but they are so rare that this is the first one ever observed while it happened. Stellar mergers are predicted to produce pre-merger mass loss in addition to mass loss from the outburst at the time of merger. We have discovered a ~3.5 arcsecond elongated feature at 3.6 and 4.5 microns in archival Spitzer/IRAC survey images, which extends directly from V1309 Sco. The images were obtained 11 months before the outburst. At the estimated distance of V1309 Sco, the extended material is ~10,000 AU in size. High resolution imaging presents the first opportunity to determine important information about both pre-merger and merger-outburst mass loss, which will be valuable in testing and refining merger models and will have general implications for stellar cluster evolution models. Spitzer/IRAC resolution is insufficient to learn details of this feature's morphology. This object has never been imaged at subarcsecond resolution. Ground-based spectra suggest that the extended material should have a complex morphology influenced by multiple mass ejections and possibly a jet. Our observations will test theoretical predictions that mergers should have significant pre-merger mass loss. We select filters to resolve and measure emission from shocked features, which we will use in conjunction with shock models and diagnostics to determine or put limits on the densities, speeds, and temperatures of both the pre-merger and post-merger ejecta which are expected to be now colliding.

We will take images. ISM AND CIRCUMSTELLAR MATTER 12 false 0.0 0.0 false false false false SUPPORTED STAR K V-IV This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 I = 19.0 NIC1 Imaging No No F164N NIC1 Imaging No No F166N NIC1 Imaging No No F187N NIC1 Imaging No No F190N NIC2 Imaging No No F212N NIC2 Imaging No No F215N POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 2 false POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 3 false POS-TARG DITHER 0.173 LINE 0.112 false false 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 4 false 1312571255941 /Users/seppo/V1309/OP-cache/V1309-final-v01.xml The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12684 :visit-id "01" :proposal-version -1 :trans-version "20110509" :date "05-Aug-2011 12:07:33.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 365632 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12684 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12684 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2864 :al-overhead-at-end 0 :internal-dur-at-end 166 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) true 1 0 1312571287511 /Users/seppo/V1309/OP-cache/V1309-final-v02.xml The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12684 :visit-id "02" :proposal-version -1 :trans-version "20110509" :date "05-Aug-2011 12:08:06.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 118304 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12684 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12684 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2800 :al-overhead-at-end 0 :internal-dur-at-end 180 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) true 1 0 1312571226057 /Users/seppo/V1309/OP-cache/V1309-final-v03.xml The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12684 :visit-id "03" :proposal-version -1 :trans-version "20110509" :date "05-Aug-2011 12:07:05.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12684 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12684 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2940 :al-overhead-at-end 116 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) true 1 0