No comments -1372831405 Assigned ID: 2760 ----- Attempting Submission 1 (Fri Mar 18 09:58:41 GMT 2022) ----- HST Phase I Proposal 2760 successfully submitted. Receipt: # 2760-1 This target is not used in this proposal. 0 ----- Attempting Submission 1 (Thu Jul 07 07:47:21 GMT 2022) ----- ----- Attempting Submission 2 (Thu Apr 27 07:27:18 GMT 2023) ----- That target was initially used for acquisition in NGC604. It is now replaced by target 11, ACQNGC604-MBH96-361 Very Massive Stars in M33 Very massive stars (VMS) are stars with masses in excess of 100 Msun. They are formed in clusters massive enough to populate the initial mass function up to high masses. They are very luminous objects spectroscopically similar to, but much less evolved than, Wolf-Rayet stars. They dominate the integrated ultraviolet spectrum of young clusters. Incorporating them in population synthesis is crucial to interpret spectroscopy of unresolved star forming regions and galaxies such as observed by the CLASSY survey. However very few VMS are directly observable in the Local Universe, especially in the UV: there are about ten such objects located either in 30 Dor in the LMC or in the Galactic cluster NGC 3603. We propose to nearly double the number of VMS UV spectra by targeting the only other place in the Local Universe where VMS can be studied individually in the UV: the two giant HII regions NGC595 and NGC604 in the Triangulum galaxy M33. Our goal is to obtain STIS/G140L spectra of nine (candidate) VMS previously identified in M33. We will determine the stellar and wind properties of VMS at sub-LMC metallicity using atmosphere models. We will determine how their mass loss rate depend on luminosity and Eddington parameter and implement these mass loss rates into new evolutionary models of VMS. Finally, we will develop population synthesis models using new empirical and synthetic spectra of VMS. We plan to obtain long slit STIS spectroscopy of nine candidate very massive stars in the galaxy M33. The stars are located in two giant HII regions: NGC595 and NGC 604. They have V magnitudes between 18.5 and 16.4. We plan to use the G140L filter combined with the MAMA detector to obtain UV spectra of these nine objects. The slit width is 2" (52"x2" in total). Each target can be observed independently, at any time (there is no time constraint). Observations need two orbits (grouped in one visit) for the faintest targets, and a single orbit for the brightest ones. Target acquisition is made either on the science target itself, or on a nearby (distance <2") bright object. Fabrice Martins and Jean-Claude Bouret are experts on the spectroscopic analysis of massive stars with the code CMFGEN. They have a record of publications studying the stellar and winds properties of OB and Wolf-Rayet stars in different environments (Galaxy, Magellanic Clouds, Local Group galaxies), using UV, optical and near-infrared spectroscopy. They are regular observers on ground-based facilities (ESO, CHFT) and on HST (STIS, COS). Ana Palacios is an expert on stellar evolution. She is a developer of the code STAREVOL. She recently implemented the treatment of VMS mass loss rates in STAREVOL. She is an expert on transport processes in stellar interiors. Stellar Physics and Stellar Types 6 false false false false false false false SUPPORTED EXT-STAR WOLF RAYET WOLF RAYET - WN NO Information retrieved from the SIMBAD database. RA/DEC from Gaia edr3 LGGS-J013332.82+304146.0 J2000 J2000 U=17.04, B=17.99 EXT-STAR WOLF RAYET WOLF RAYET - WN NO Information retrieved from the SIMBAD database. RA/DEC from Gaia edr3 AM85-M33-4 LGGS-J013332.97+304136.1 J2000 J2000 U=16.964, B=17.936 EXT-STAR WOLF RAYET NO This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 U=17.51 EXT-STAR WOLF RAYET NO This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 U=17.34, B=18.11 EXT-STAR WOLF RAYET WOLF RAYET - WN NO This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 U=16.57, B=17.20 EXT-STAR WOLF RAYET NO This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 U=16.70, B=17.38 EXT-STAR WOLF RAYET NO This object was generated by the targetselector and retrieved from the SIMBAD database. MBH96-365 J2000 J2000 B=16.27 EXT-STAR WOLF RAYET WOLF RAYET - WN NO This object was generated by the targetselector and retrieved from the SIMBAD database. CM81-13 J2000 J2000 U=16.680, B=17.492 EXT-STAR WOLF RAYET NO This object was generated by the targetselector and retrieved from the SIMBAD database. MBH96-367 LGGS-J013433.10+304659.0 J2000 J2000 U=15.671, B=16.661 EXT-STAR SUPERGIANT O NO J2000 B=16.4 EXT-STAR GIANT O J2000 U=16.97 / R=18.58 / I=18.78 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 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 STIS/FUV-MAMA Spectroscopic No No G140L 1425 /home/fmartins/proposal/hst/2022/OP-cache/phaseII_resubmitted-v01.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. STIS G140L observation of star NGC595 5 (Tic-Visit :proposal-id 17085 :visit-id "01" :proposal-version -1 :trans-version "20220516" :date "27-Apr-2023 09:18:01.0" :trans-errors '(:WARNINGS 0 :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 174416 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17085 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17085 :visit-id "01" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2787 :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 3180 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17085 :visit-id "01" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2788 :al-overhead-at-end 126 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) true 2 0 /home/fmartins/proposal/hst/2022/OP-cache/phaseII_resubmitted-v02.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. STIS G140L observation of star NGC595 4 (Tic-Visit :proposal-id 17085 :visit-id "02" :proposal-version -1 :trans-version "20220516" :date "27-Apr-2023 09:18:02.0" :trans-errors '(:WARNINGS 0 :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 174416 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17085 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17085 :visit-id "02" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2787 :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 3180 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17085 :visit-id "02" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2788 :al-overhead-at-end 126 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) true 2 0 /home/fmartins/proposal/hst/2022/OP-cache/phaseII_resubmitted-v03.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. STIS G140L observation of star NGC595 1 Target acquisition on star 58, then offset to star 1 (Tic-Visit :proposal-id 17085 :visit-id "03" :proposal-version -1 :trans-version "20220516" :date "27-Apr-2023 09:18:02.0" :trans-errors '(:WARNINGS 0 :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 174416 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17085 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17085 :visit-id "03" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2787 :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 3180 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17085 :visit-id "03" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2788 :al-overhead-at-end 126 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) true 2 0 /home/fmartins/proposal/hst/2022/OP-cache/phaseII_resubmitted-v04.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. STIS G140L observation of star NGC595 58 (Tic-Visit :proposal-id 17085 :visit-id "04" :proposal-version -1 :trans-version "20220516" :date "27-Apr-2023 09:18:03.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 87408 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17085 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17085 :visit-id "04" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2787 :al-overhead-at-end 0 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) true 1 0 /home/fmartins/proposal/hst/2022/OP-cache/phaseII_resubmitted-v05.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. STIS G140L observation of star NGC595 62 Acquisition on NGC595 4, then offset to target (Tic-Visit :proposal-id 17085 :visit-id "05" :proposal-version -1 :trans-version "20220516" :date "27-Apr-2023 09:18:03.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 87408 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17085 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17085 :visit-id "05" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2787 :al-overhead-at-end 0 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) true 1 0 /home/fmartins/proposal/hst/2022/OP-cache/phaseII_resubmitted-v06.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. STIS G140L observation of star NGC595 2B Target acquisition on star NGC595 4, then offset to star 2B (Tic-Visit :proposal-id 17085 :visit-id "06" :proposal-version -1 :trans-version "20220516" :date "27-Apr-2023 09:18:04.0" :trans-errors '(:WARNINGS 0 :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 174416 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17085 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17085 :visit-id "06" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2787 :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 3180 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17085 :visit-id "06" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2788 :al-overhead-at-end 126 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) true 2 0 /home/fmartins/proposal/hst/2022/OP-cache/phaseII_resubmitted-v07.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. STISG140L observations of NGC604 245 Acquisition on MBH96 361then offset to star NGC604 245 (Tic-Visit :proposal-id 17085 :visit-id "07" :proposal-version -1 :trans-version "20220516" :date "27-Apr-2023 09:09:43.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 87408 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17085 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17085 :visit-id "07" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2787 :al-overhead-at-end 0 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) true 1 0 /home/fmartins/proposal/hst/2022/OP-cache/phaseII_resubmitted-v08.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. STIS G140L observation of star NGC604 6 Target acquisition MBH96 361, then offset to star 6 (Tic-Visit :proposal-id 17085 :visit-id "08" :proposal-version -1 :trans-version "20220516" :date "27-Apr-2023 09:11:12.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 87408 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17085 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17085 :visit-id "08" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2787 :al-overhead-at-end 0 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) true 1 0 /home/fmartins/proposal/hst/2022/OP-cache/phaseII_resubmitted-v09.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. STIS G140L observation of star NGC604 143 Acquisition on MBH96 361 then offset to NGC604 143 (Tic-Visit :proposal-id 17085 :visit-id "09" :proposal-version -1 :trans-version "20220516" :date "27-Apr-2023 09:12:17.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 87408 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17085 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17085 :visit-id "09" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2787 :al-overhead-at-end 0 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) true 1 0