0 Assigned ID: 638 ----- Attempting Submission 1 (Fri Apr 07 16:50:12 GMT 2017) ----- HST Phase I Proposal 638 (VMS.apt) successfully submitted. Receipt: # 638-1 ----- Attempting Submission 2 (Fri Apr 07 20:36:39 GMT 2017) ----- HST Phase I Proposal 638 (VMS.apt) successfully submitted. Receipt: # 638-2 ----- Attempting Submission 3 (Fri Apr 07 21:01:37 GMT 2017) ----- HST Phase I Proposal 638 (VMS.apt) successfully submitted. Receipt: # 638-3 ----- Attempting Submission 4 (Fri Apr 07 23:35:11 GMT 2017) ----- HST Phase I Proposal 638 (VMS.apt) successfully submitted. Receipt: # 638-4 The BOT check for NGC4449 has been done by hand - see comments in APT file. On further photometry of the most distant galaxy Mrk 930, it was determined that the clusters in this object are too faint to obtain a reasonable S/N in 4 orbits. The target was therefore removed and the the 4 orbits were divided between SBS0335 and NGC4449. -348376321 ----- Attempting Submission 1 (Sun Jul 23 19:28:53 GMT 2017) ----- HST Phase II Proposal 15116 (15116_P2.apt) successfully submitted. Receipt: # 15116-1 ----- Attempting Submission 2 (Sun Aug 06 20:45:21 GMT 2017) ----- Very Massive Stars in the Local Universe The upper mass limit for stars is unknown. Recent UV observations of young (< 3 Myr), massive star clusters (>5 x10^4 M_sun) suggest that stars substantially more massive than 100 M_sun exist. These very massive stars (VMS) are not properly accounted for in current stellar population synthesis (SPS) codes, even though they will dominate the ionization and mechanical feedback in star-forming regions for the first few Myr. VMS have been detected as resolved stars in the nearby LMC cluster R136 and in the integrated light of two young super star clusters in two nearby starburst galaxies. Since JWST will obtain numerous UV rest-frame spectra of young high redshift galaxies, it is essential that we investigate whether VMS are common in local, low metallicity analogs, while we still have access to the UV domain. We propose to obtain FUV STIS spectroscopy of young (< 3 Myr) super star clusters in 4 starbursting galaxies with the aim of establishing if VMS are commonly formed in dense star-forming events at low metallicity. The crucial spectral diagnostics for VMS are only available in the FUV, and we will use the spectroscopy together with new SPS models to constrain the upper mass limit to the initial mass function, and to test the importance of VMS for feedback. These spectra will form an important part of the UV legacy of HST and will provide an excellent local-universe analog to the rest-frame UV spectra of high-z galaxies to be obtained with JWST. HST images were used to locate GSC2 stars to use as offsets. The offset to each target was measured from the offset star coordinates on the HST image. The slit orientation was chosen to pass through as many clusters as possible. A 4 point dither along the slit was chosen with a 0.5 arcsec spacing. The exposure times were determined using COS spectra of different regions in the galaxies and scaling using F140LP images. Stellar Populations 6 false false true false false false false SUPPORTED GALAXY DWARF COMPACT STARBURST YES J2000 F(1400)=3.0E-15 GALAXY DWARF COMPACT STARBURST J2000 F(1400) =2.0E-15 GALAXY DWARF COMPACT STARBURST J2000 F(1400)=1.7E-15 STAR F0-F2 NO J2000 STAR F3-F9 NO J2000 STAR F0-F2 NO J2000 STAR F0-F2 J2000 GALAXY DWARF COMPACT STARBURST YES STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/FUV-MAMA Spectroscopic No No G140L 1425 POS-TARG DITHER 0.5 LINE false false 4 90.0 STIS-ALONG-SLIT 1 false The scheduling data was generated by CASM 26.2.2. CASM was run in Phase II mode. 1552872398000 90.0 (Tic-Visit :proposal-id 15116 :visit-id "01" :proposal-version -1 :trans-version "20181130" :date "03-Jan-2019 16:00:48.0" :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 626736 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15116 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15116 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2812 :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 3145 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15116 :visit-id "01" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2843 :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 3145 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15116 :visit-id "01" :orbit-number 3 :pcs-time 302 :si-vis-utilization 2843 :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 3145 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15116 :visit-id "01" :orbit-number 4 :pcs-time 302 :si-vis-utilization 2843 :al-overhead-at-end 0 :internal-dur-at-end 375 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3145 :pcs-gap 0 ) false 4 0 The scheduling data was generated by CASM 27.0. CASM was run in Phase II mode. /private/var/folders/z3/xy_g1v_s5fz9yrhzb8thz4cr0001qc/T/OPVisit10761394402261861687.xml (Tic-Visit :proposal-id 15116 :visit-id "02" :proposal-version -1 :trans-version "20181130" :date "14-Jun-2019 15:32:55.0" :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 644144 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15116 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15116 :visit-id "02" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2997 :al-overhead-at-end 85 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15116 :visit-id "02" :orbit-number 2 :pcs-time 256 :si-vis-utilization 2982 :al-overhead-at-end 85 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15116 :visit-id "02" :orbit-number 3 :pcs-time 256 :si-vis-utilization 2982 :al-overhead-at-end 85 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15116 :visit-id "02" :orbit-number 4 :pcs-time 256 :si-vis-utilization 2982 :al-overhead-at-end 85 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) true 4 0 STIS.sp.1016820 - check on counts - BOP - no GALEX data Reines et al. (2010, ApJ, 708, 26) give a flux density for the target S26 of 1.3 E-14 erg/s/cm^2/A with the F170W WFPC2 filter. This is the shortest wavelength observation. The region S26 is much larger than the 0.2 arcsec STIS slit so this is a strong upper limit. Using the STIS ETC, the above flux at 1821 A (central wavelength of F170W), assuming an O3 V spectral type and no reddening, gives the number of counts as 0.65 c/s so the target is safe. The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1544743028000 48.0 (Tic-Visit :proposal-id 15116 :visit-id "03" :proposal-version -1 :trans-version "20181130" :date "03-Jan-2019 14:48:47.0" :trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 313584 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15116 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15116 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2876 :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 3149 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15116 :visit-id "03" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2987 :al-overhead-at-end 0 :internal-dur-at-end 375 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) false 2 2 The scheduling data was generated by CASM 27.0. CASM was run in Phase II mode. /private/var/folders/z3/xy_g1v_s5fz9yrhzb8thz4cr0001qc/T/OPVisit12385346383125639544.xml (Tic-Visit :proposal-id 15116 :visit-id "51" :proposal-version -1 :trans-version "20181130" :date "14-Jun-2019 15:32:58.0" :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 626736 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15116 :visit-id "51" :obset-id "51" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15116 :visit-id "51" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2812 :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 3145 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15116 :visit-id "51" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2843 :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 3145 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15116 :visit-id "51" :orbit-number 3 :pcs-time 302 :si-vis-utilization 2843 :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 3145 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15116 :visit-id "51" :orbit-number 4 :pcs-time 302 :si-vis-utilization 2843 :al-overhead-at-end 0 :internal-dur-at-end 375 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3145 :pcs-gap 0 ) true 4 0