0 Assigned ID: 1394 ----- Attempting Submission 1 (Fri Mar 01 04:19:17 GMT 2013) ----- HST Phase I Proposal 1394 (SSS_phase1_Sci.pdf.apt) successfully submitted. ----- Attempting Submission 2 (Fri Mar 01 23:40:10 GMT 2013) ----- HST Phase I Proposal 1394 (SSS_phase1_Sci.pdf.apt) successfully submitted. ----- Attempting Submission 3 (Fri Mar 01 23:59:12 GMT 2013) ----- HST Phase I Proposal 1394 (SSS_phase1_Sci.pdf.apt) successfully submitted. ----- Attempting Submission 4 (Sat Mar 02 00:39:13 GMT 2013) ----- Updated slits to 31x0.05NDA for HHD147933 and HD147934 to keep within STIS health and safety limits. The 52x0.05 slit must now be used for HD147888 in order to match the resolution of the other stars. ETC runs have been updated accordingly, and orients added to keep unwanted stars out of the slit. 123540693 ----- Attempting Submission 1 (Wed Jun 19 16:14:41 GMT 2013) ----- ----- Attempting Submission 2 (Thu Jun 26 20:33:30 GMT 2014) ----- The first evidence for variations in diffuse interstellar band (DIB) strengths over distance scales as small as a few hundred AU was presented by Cordiner et al. (2013), who measured diferences of 5% - 9% in the equivalent widths of several DIBs between the close binary stars rho Oph A and B (separated by c. 344 AU). Larger differences were observed between AB and rho Oph D (separation 19,000 AU), indicative of substantial small-scale variations in the abundances of the large molecules believed to cause the DIBs. This finding offers an unprecedented opportunity to examine the factors that control diffuse band strengths in the relatively small and controlled environment of rho Oph, in order to help resolve the 92-year-old mystery of the identities of the carriers. A secondary objective is to measure the properties of the gas responsible for small-scale structure towards rho Oph, and ascertain the cause of previously-observed atomic and molecular absorption line strength variations. This will provide important information on the nature of diffuse molecular gas in a star-forming region, of relevance to theories regarding molecular cloud formation. We propose to achieve these goals through very high-sensitivity measurements of the ionisation state, temperature, density and depletion of the interstellar gases in the sightlines towards rho Oph A, B and D through high-signal-to-noise, high-resolution observations of atoms, ions and molecules at wavelengths 117-240 nm. Primary diagnostics include the relatively-unsaturated absorption lines of C I, Fe I, Fe II and C2. We require use of the high-resolution MAMA UV echelle, and aim to abtain the highest S/N possible for C$_2$ and Fe lines (while keeping the observing time request reasonable), in order to detect small differences in line strengths between our targets. We thus propose to obtain a continuum S/N of 130 in the spectral range 2124-2401~\AA\ using the E230H $c2263$ echelle setting with the NUV-MAMA detector. The $0.2''$ slit will be employed to maximise throughput and provide sufficient resolution for our science goals in this spectral region. Using the online STIS ETC with flux-calibrated user-supplied spectra of each star obtained from the IUE archive, the desired S/N can be obtained in approximately 3000~s for $\rho$~Oph~B and 5000~s for $\rho$~Oph A. To obtain the required C\,{\sc i} fine structure spectra at 1190-1330~\AA, as well as (relatively unsaturated) lines of O\,{\sc i}, P\,{\sc ii}, Kr\,{\sc i}, Ge\,{\sc ii}, Mg\,{\sc ii}, Mn\,{\sc ii} and Ni\,{\sc ii}, we propose to employ the E140H $i1271$ echelle setting in the FUV. Use of the $0.03''$ slit is required for observation of $\rho$~Oph A and B which, according to the ETC, have total detector count rates of 104,000~s$^{-1}$ and 143,000~s$^{-1}$, respectively, in the range 1170-1372~\AA. In order to discern differences in spectral line profiles at the level of a few percent, we also require reobservation of $\rho$~Oph D in the FUV using the $0.03''$ slit. Required exposure times to reach the required S/N of $\approx100$ at 1270~\AA\ are 2000~s for A, 1500~s B and 8000~s for D. To achieve highest possible resolution, we request use of the `repeller wire off setting' of the FUV MAMA. To keep within the $2'$ limit for small-angle maneuvers, we propose to observe A \& B in one visit and D in a separate visit. The STIS CCD will be used for target acquisition; counts from our (bright) targets will be restricted by use of the O\,{\sc ii} filter. Two 6-minute peakup maneuvers will be required to center the stars in the $0.03''$ slit at the start of FUV observations. The telescope pointing accuracy is $0.003''$ for a $3''$ small-angle maneuver (SAM), so an additional peakup is not required after the $3.1''$ SAM from B to A. No peakup is required for the $0.2''$ slit. ISM AND CIRCUMSTELLAR MATTER 12 false true false false AVAILABLE STAR B0-B2 V-IV Coordinates from Hipparcos, calculated for J2000 including proper motion RHO-OPH-A J2000 J2000 1.75e-10 erg/cm2/s/A at 1320 A; 1.20e-11 erg/cm2/s/A at 2300 A (+- 10%) STAR B0-B2 V-IV Coordinates from Hipparcos, calculated for J2000 including proper motion RHO-OPH-B J2000 J2000 2.43e-10 erg/cm2/s/A at 1320 A; 1.89e-11 erg/cm2/s/A at 2300 A (+- 10%) STAR B3-B5 III-I This object was generated by the targetselector and retrieved from the SIMBAD database. RHO-OPH-D J2000 J2000 3.6e-11 erg/cm2/s/A at 1320 A (+- 10%) STIS/FUV-MAMA Spectroscopic No No E140H 1271 STIS/FUV-MAMA Spectroscopic No No E140H 1271 STIS/NUV-MAMA Spectroscopic No No E230H 2263 STIS/NUV-MAMA Spectroscopic No No E230H 2263 STIS/FUV-MAMA Spectroscopic No No E140H 1271 1403814805817 The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. 1409872656000 99.2786254105929 (Tic-Visit :proposal-id 13365 :visit-id "01" :proposal-version -1 :trans-version "20130502" :date "26-Jun-2014 16:33:24.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 471392 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13365 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13365 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2911 :al-overhead-at-end 0 :internal-dur-at-end 113 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3244 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13365 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3022 :al-overhead-at-end 245 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3244 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13365 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3022 :al-overhead-at-end 0 :internal-dur-at-end 113 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3244 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13365 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3022 :al-overhead-at-end 132 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3244 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13365 :visit-id "01" :orbit-number 5 :pcs-time 222 :si-vis-utilization 3022 :al-overhead-at-end 250 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3244 :pcs-gap 0 ) true 5 0 3x3 pixel box 18,036 or S/N ~130 ETC is for 1 second integration with 52x0.05 This ACQPEAK is with 31x0.05NDA with 0.4 times the predicted count rate. 8827*0.4 = 3530 per 7 pixel high sample or S/N~59 ETC run uses a scaled IUE large aperture spectrum (that includes flux from both HD147933 and HD147934). Scaling factor of 0.65 accounts for the contribution of HD147933, and factor 0.4 accounts for the difference in throughput between the requested 31x0.05NDA slit and the 52x0.05 slit available in the ETC. ETC run uses a scaled IUE large aperture spectrum (that includes flux from both HD147933 and HD147934). Scaling factor of 0.65 accounts for the contribution of HD147933, and factor 0.4 accounts for the difference in throughput between the requested 31x0.05NDA slit and the 52x0.05 slit available in the ETC. Count rate for 52x0.05 aperture is 7685 counts/2.5 (31x0.05NDB = ND0.4 or 1/2.5) =3074 counts per 7 pixel res element ETC run uses a scaled IUE large aperture spectrum (that includes flux from both HD147933 and HD147934). Scaling factor of 0.35 accounts for the contribution of HD147934, and factor 0.4 accounts for the difference in throughput between the requested 31x0.05NDA slit and the 52x0.05 slit available in the ETC. ETC run uses a scaled IUE large aperture spectrum (that includes flux from both HD147933 and HD147934). Scaling factor of 0.35 accounts for the contribution of HD147934, and factor 0.4 accounts for the difference in throughput between the requested 31x0.05NDA slit and the 52x0.05 slit available in the ETC. ETC run uses a scaled IUE large aperture spectrum (that includes flux from both HD147933 and HD147934). Scaling factor of 0.35 accounts for the contribution of HD147934, and factor 0.4 accounts for the difference in throughput between the requested 31x0.05NDA slit and the 52x0.05 slit available in the ETC. 1403812020575 The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. 1407923352000 98.62614592531742 (Tic-Visit :proposal-id 13365 :visit-id "02" :proposal-version -1 :trans-version "20130502" :date "26-Jun-2014 15:46:59.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 261968 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13365 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13365 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2911 :al-overhead-at-end 0 :internal-dur-at-end 113 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3244 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13365 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3021 :al-overhead-at-end 99 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3244 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13365 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3022 :al-overhead-at-end 99 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3244 :pcs-gap 0 ) true 3 0 Use 52x0.05 aperture to match spectral resolution for Rho Oph A and B 1 sec integration yields 3600 c/resolution element 7 pixels high. Utilize the 52x0.05 aperture to match the spectral resolution for Rho Oph A and B. global count rate is 57,000 c/s See 02.003 for global count rate See 02.003 for global count rate