Identical Phase II to Visit 1 (Apr 2012) +visit 7 (Oct 2012) of GO12465 aside from G430M central wavelength and epoch. GO13052 visit 1 requested for Oct 2012, with visit 2 in Apr 2013. ----- Attempting Submission 1 (Fri Jul 06 08:53:19 GMT 2012) ----- We propose to carry out a comprehensive census of the most massive stars in the central parsec (4") of the starburst cluster, R136, which powers the Tarantula Nebula in the LMC. R136 is both sufficiently massive that the upper mass function is richly populated and young enough that its most massive stars have yet to explode as supernovae. The identification of very massive stars in R136, up to 300 solar masses, raises general questions of star formation, binarity and feedback in young massive clusters. The proposed STIS spectral survey of ~36 stars more massive than ~50 solar masses within R136 is ground-breaking, of legacy value, and is specifically tailored to a) yield physical properties; b) detect the majority of binaries by splitting observations between Cycles 19 and 20; c) measure rotational velocities, relevant for predictions of rotational mixing; d) quantify mass-loss properties for very massive stars; e) determine surface compositions; f) measure radial velocities, relevant for runaway stars and cluster dynamics; g) quantify radiative and mechanical feedback. This census will enable the mass function of very massive stars to be measured for the first time, as a result of incomplete and inadequate spectroscopy to date. It will also perfectly complement our Tarantula Survey, a ground-based VLT Large Programme, by including the most massive stars that are inaccessible to ground-based visual spectroscopy due to severe crowding. These surveys, together with existing integrated UV and optical studies will enable 30 Doradus to serve as a bona-fide template for unresolved extragalactic starburst regions. Completion of Cycle 19 (GO 12465) UV + optical slit scan across LMC star cluster R136 from SE to NW. Due to severe crowding in cluster core, initial acquisition (+ peakup) is of an isolated bright star Melnick 34. Offset positions and position angle 64 degrees (E of N) are selected to ensure that both R136a1 and a2 are included in NW1 slit (offset: -1.863 sec in RA and +2.97 arcsec in Dec with respect to Melnick 34). Execution split across Cycles 19 and 20 to search for long period binaries. Visit 1 G430M setup requested in Oct 2012 window to ensure 6 month baseline with respect to Cycle 19 G430M visit (SE9-NW1, Apr 2012) necessary to search for radial velocity variations (resulting from potential long period binary companions). Similarly Visit 2 setup requested for Apr 2013 window, since other G430M visits for NW2-NW8 scheduled for Oct 2012. ICRS coordinates for Melnick 34 are obtained from 2MASS. F555W photometry of brightest source in each slit is obtained from WFC3 images (De Marchi et al. 2011). Visits 1 + 2 in GO 13052 identical to visits 1 + 7 for GO 12465 except for G430M wavelength setup (3936 -> 4194). HOT STARS 12 false 0.0 0.0 false false false false SUPPORTED EXT-CLUSTER OPEN CLUSTER STAR FORMING REGION VEGAMAG Photometry from WFC3 F555W Early Release Obervation IB6WD6050 (De Marchi et al. 2011). ICRS astrometry of Melnick 34 (2MASS 05384424-6906058). Used for acquision due to severe crowding within R136 itself. J2000 J2000 B-V = 0.25 EXT-CLUSTER OPEN CLUSTER -9.176 arcsec RA, 1.350 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit Hunter 55 (VEGA V = 14.74) EXT-CLUSTER OPEN CLUSTER -9.264 arcsec RA, +1.530 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit - R136B (VEGA V = 13.24) EXT-CLUSTER OPEN CLUSTER -9.352 arcsec RA, +1.710 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit - Hunter 45 (VEGA V = 14.65) EXT-CLUSTER OPEN CLUSTER -9.439 arcsec RA, +1.890 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit - Hunter 116 (VEGA V = 15.788) EXT-CLUSTER OPEN CLUSTER -9.527 arcsec RA, +2.070 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit - Hunter69 (VEGA B = 15.1) EXT-CLUSTER OPEN CLUSTER -9.615 arcsec RA, +2.250 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit - Hunter 73 (VEGA V = 15.13) EXT-CLUSTER OPEN CLUSTER -9.703 arcsec RA, +2.430 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit - Hunter 3 (VEGA V = 14.41) EXT-CLUSTER OPEN CLUSTER -9.790 arcsec RA, +2.610 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit - Hunter 50 (VEGA V = 14.65) EXT-CLUSTER OPEN CLUSTER -9.878 arcsec RA, +2.790 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit R136a3 (VEGA V = 12.97) EXT-CLUSTER OPEN CLUSTER -9.966 arcsec RA, +2.970 arcsec Dec offset (R136a1/a2) from Mk34 in WFC3 V555W image. Brightest cluster star in slit R136a1 (VEGA V = 12.28) EXT-CLUSTER OPEN CLUSTER -10.054 arcsec RA, +3.150 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit - R136a7 (VEGA V = 13.97) EXT-CLUSTER OPEN CLUSTER -10.142 arcsec RA, +3.330 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit - R136a4+a8 (VEGA V = 13.41) EXT-CLUSTER OPEN CLUSTER -10.229 arcsec RA, +3.510 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit - Hunter 30 (VEGA V = 14.21) EXT-CLUSTER OPEN CLUSTER -10.317 arcsec RA, 3.690 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit - Hunter 35 (VEGA V = 14.43 EXT-CLUSTER OPEN CLUSTER -10.405 arcsec RA, +3.870 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit - Hunter 92 (VEGA V = 15.46) EXT-CLUSTER OPEN CLUSTER -10.493 arcsec RA, +4.050 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit - Hunter 64 (VEGA V = 15.03) EXT-CLUSTER OPEN CLUSTER -10.580 arcsec RA, +4.230 arcsec Dec offset from Mk34 in WFC3 V555W image. Brightest cluster star in slit - Hunter 40 (VEGA V = 14.56) STIS/CCD Spectroscopic No No G430M 4194 STIS/CCD Spectroscopic No No G430M 4451 STIS/CCD Spectroscopic No No G430M 4706 STIS/CCD Spectroscopic No No G750M 6581 STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/CCD Spectroscopic No No G430M 3936 POS-TARG DITHER 0.35546 0.35546 arcsec = 7 CCD pixels x 0.05078 arcsec/pix (= pixels over which 1D spectra extracted) LINE false false 2 90.0 STIS-ALONG-SLIT 4 false The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. /Users/pac/Documents/OP-cache/13052_July2012-v01.xml 1341478888368 STIS G430M/4194 scan (52x0.2 arcsec) across star cluster R136 at 10 (visit 1) + 7 (visit 2) adjoining slit positions (PA=64 degrees). ORIENT = PA+45 or PA+180+45 = 109 or 289 (Tic-Visit :proposal-id 13052 :visit-id "01" :proposal-version -1 :trans-version "20120604" :date "05-Jul-2012 10:01:24.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 460544 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13052 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13052 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3190 :al-overhead-at-end 72 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3582 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13052 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3102 :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 3582 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13052 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3082 :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 3582 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13052 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3085 :al-overhead-at-end 0 :internal-dur-at-end 399 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3582 :pcs-gap 0 ) true 4 0 ETC predicts S/N=174 for 1 sec exposure through F28X50LP aperture for Melnick 34 (V=13.09). Peakup on Melnick 34 for accurate positioning prior to offset. ETC predicts 58,000 e- from source in 0.5 sec exposure through 52x0.1 aperture for Melnick 34 (V=13.09), order of magnitude below saturation level. The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. /Users/pac/Documents/OP-cache/13052_July2012-v02.xml 1341478894431 STIS G430M/4194 slit scan (52x0.2 arcsec) across R136 at 10 (visit 1) + 7 (visit 2) adjoining positions (PA=64 degrees). ORIENT = PA+45 or PA+180+45 = 109 or 289 (Tic-Visit :proposal-id 13052 :visit-id "02" :proposal-version -1 :trans-version "20120604" :date "05-Jul-2012 10:01:33.0" :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 331728 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13052 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13052 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3080 :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 3582 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13052 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3082 :al-overhead-at-end 72 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3582 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13052 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3085 :al-overhead-at-end 0 :internal-dur-at-end 360 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3582 :pcs-gap 0 ) true 3 0 ETC predicts S/N=174 for 1 sec exposure through F28X50LP aperture for Melnick 34 (V=13.09). Peakup on Melnick 34 for accurate positioning prior to offset. ETC predicts 58,000 e- from source in 0.5 sec exposure through 52x0.1 aperture for Melnick 34 (V=13.09), order of magnitude below saturation level.