Proposal 15942 (STScI Edit Number: 0, Created: Thursday, March 5, 2020 at 12:00:37 PM Eastern Standard Time) - Overview

15942 - Are the most massive stars in the Local Group truly single? Cycle: 27, Proposal Category: GO (Availability Mode: SUPPORTED)

INVESTIGATORS Name Institution E-Mail Dr. Tomer Shenar (PI) (ESA Member) (Contact Katholieke Universiteit Leuven [email protected] ) Prof. Hugues Sana (CoI) (ESA Member) Katholieke Universiteit Leuven [email protected] Dr. Laurent Mahy (CoI) (ESA Member) Katholieke Universiteit Leuven [email protected] Dr. Rainer Hainich (CoI) (ESA Member) Universitat Potsdam [email protected]. de Dr. Lida Oskinova (CoI) (ESA Member) Universitat Potsdam [email protected] Dr. Andreas Sander (CoI) (ESA Member) Armagh Observatory [email protected]

VISITS Visit Targets used in Visit Configurations used in Visit Orbits Used Last Orbit Planner Run OP Current with Visit? 01 (5) BAT99-116-MK-34 STIS/CCD 1 05-Mar-2020 12:00:29.0 yes (6) A1-2 02 (5) BAT99-116-MK-34 STIS/CCD 1 05-Mar-2020 12:00:31.0 yes (6) A1-2 03 (5) BAT99-116-MK-34 STIS/CCD 1 05-Mar-2020 12:00:32.0 yes (6) A1-2 04 (5) BAT99-116-MK-34 STIS/CCD 1 05-Mar-2020 12:00:34.0 yes (7) A3-C 05 (5) BAT99-116-MK-34 STIS/CCD 1 05-Mar-2020 12:00:35.0 yes (7) A3-C

1 Proposal 15942 (STScI Edit Number: 0, Created: Thursday, March 5, 2020 at 12:00:37 PM Eastern Standard Time) - Overview Visit Targets used in Visit Configurations used in Visit Orbits Used Last Orbit Planner Run OP Current with Visit? 06 (5) BAT99-116-MK-34 STIS/CCD 1 05-Mar-2020 12:00:37.0 yes (7) A3-C 6 Total Orbits Used

ABSTRACT The chemical evolution and integrated appearance of galaxies are governed by the most massive stars they host. With masses in excess of 50 solar masses (Ms), these stars dominate entire clusters in terms of their energy production. They are ideal progenitors of superluminous / pair-instability supernovae, gamma-ray bursts, and the massive black holes identified through recent gravitational-wave detections. While fundamental to many of our models and predictions, we do not know how massive a star can become. Masses derived from binary orbits generally do not exceed 130Ms. In contrast, a few supposedly-single stars residing in R136 in the Large Magellanic Cloud (LMC) were reported to have masses exceeding 300Ms, twice the canonical upper-mass limit. These mass estimates, however, rely on one risky assumption: that the stars are single. The incidence of multiplicity among the massive stars and the very high crowding in R136 shed doubts on the single-star assumption and warrant a careful investigation of these stars.

Several known binaries with components more massive than 100Ms have periods of the order of several months. And yet, the most massive stars in R136 have only been investigated on a time-base of a few weeks and with low-resolution spectroscopy. Here, we propose to collect 3 epochs of HST/STIS spectroscopy of the four most massive candidate stars in the Local Group - R136 a1, a2, a3, and c. With merely 6 orbits, and relying on data quality that is exclusive to the HST/STIS and vital for the study, our analysis will yield statistically-firm constraints on the multiplicity of these objects within a 90% detection limit up to a period of about three years.

OBSERVING DESCRIPTION Goal: Secure 3 epochs of optical spectra (G430 M 3936, 4706, 4961) per target for BAT99 106, 108, 109, and 112 (R136 a3, a1, a2, and c).

We define two slit orientations: 1. A1-2: defined between R136 a1 and a2, centered at midpoint of R136 a1 and a2 (5:38:42.3978 -69:06:3.03 orient angle 109 / 289, position angle 64 / 249) 2. A3-C: defined between R136 a3 and c, centered at midpoint of R136 a3 and c (5:38:42.6166 -69:06:4.1785, orient angle 162.2 / 342.2, position 2 Proposal 15942 (STScI Edit Number: 0, Created: Thursday, March 5, 2020 at 12:00:37 PM Eastern Standard Time) - Overview angle 116.8 / 296.8)

Due to crowding, slit positioning is relative to initial acquisition + peakup of the bright and isolated star BAT99 116 (Melnick 34, Brey 84).

3 Proposal 15942-A1-2,firstepoch(01)ArethemostmassivestarsinLocalGrouptruly single? Fixed Targets Patterns Visit Description=[WOLF RAYET-WN] Category=STAR Brightest clusterstarinslitR136a1(BAT99108).VEGAV=12.28 Crowther etal.2016). Comments: CenterbetweenR136a1andR136a2(BAT99108109),-1.862 sec(RA)and2.975(DEC)offsetrelativetoBrey84(Melnick34).DeterminedfromF336WWFC3imageofR136(deMarchietal.2011, (6) Extended=NO Description=[WOLF RAYET-WN] Category=STAR acquision duetoseverecrowdingwithinR136itself.CoordinatesofMk34 in*astrometricallty-uncorrecred"WFCimage:'053844.2416','-69065.930' Comments: VEGAMAGPhotometryfromWFC3F555WEarlyReleaseObervation IB6WD6050(DeMarchietal.2011).ICRSastrometryofMelnick34fromGaiaDR2(Gaia4657685534828257792).Usedfor (5) # (4) # Special Requirements:SCHED80%;ORIENT106DTO106D;286D286D Scientific Instruments:STIS/CCD Diagnostic Status:NoDiagnostics Proposal 15942,A1-2,firstepoch(01),implementation A1-2 BAT99-116-MK-34 Name Line Spacing= Point Spacing=0.35546 Number OfPoints=2 Purpose=DITHER Pattern Type=STIS-ALONG-SLIT Primary Pattern Dec Offset:2.97Arcsec RA Offset:-1.86Secs Offset fromBAT99-116-MK-34 Equinox: J2000 Dec: -69066.01(-69.10167d) RA: 053844.2508(84.6843783d) Target Coordinates Center Pattern=false Angle BetweenSides= Pattern Orientation=90.0 Coordinate Frame=POS-TARG Epoch ofPosition:2000 Proper MotionDec:0.753mas/yr Proper MotionRA:1.874mas/yr Targ. Coord.Corrections Secondary Pattern 4 V=12.28 B-V=0.25 V=13.09+/-0.01 Fluxes Offset Position(A1-2) Reference Frame:ICRS Miscellaneous (3), (4),(5) Exposures Thu Mar0517:00:37GMT2020 Proposal 15942-A1-2,firstepoch(01)ArethemostmassivestarsinLocalGrouptruly single? Exposures ETC runsperformedforexposuretimesinfirstphaseIIsubmission.The exposure timesinthssecondsubmissionareslightlyshorter,S/Nandotherparameterseasilyscalable. Comments: ETCrunforfainterR136a2:1367422 5 ETC runsperformedforexposuretimesinfirstphaseIIsubmission.The exposure timesinthssecondsubmissionareslightlyshorter,S/Nandotherparameterseasilyscalable. Comments: ETCrunforfainterR136a2:1367279 4 ETC runsperformedforexposuretimesinfirstphaseIIsubmission.The exposure timesinthssecondsubmissionaresomewhatshorter,S/Nandotherparameterseasilyscalable. Comments: ETCrunforfainterR136a2:1367278 3 on level. Comments: PeakuponMelnick34foraccuratepositioningpriortooffset. ETCpredicts58,000e-fromsourcein0.5secexposurethrough52x0.1apertureforMelnick34(V=13.09),orderofmagnitudebelowsaturati 2 Comments: ETCpredictsS/N=174for1secexposurethroughF28X50LPapertureMelnick34(V=13.09). 1 # (1367603) (1367602) (1367600) (198019) k 34 Acq-peak-M (197926) Acq Mk34 (ETC Run) Label (6) A1-2 (6) A1-2 (6) A1-2 34 (5) BAT99-116-MK- 34 (5) BAT99-116-MK- Target STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACQ/PEAK,52X0.1 STIS/CCD, ACQ,F28X50LP Config,Mode,Aperture 4961 A G430M 4706 A G430M 3936 A G430M MIRROR MIRROR Spectral Els. CR-SPLIT=NO CR-SPLIT=NO CR-SPLIT=NO Opt. Params. 5 Special Reqs. Groups 1) (4) n A1-2,firstepoch(0 Pattern 4,Exps5-5i 1) (4) n A1-2,firstepoch(0 Pattern 4,Exps4-4i 1) (4) n A1-2,firstepoch(0 Pattern 4,Exps3-3i [==>] 0.5 Secs(0.5Secs) [==>] 1 Secs(1Secs) Exp. Time(Total)/[ActualDur.] [==>304.0 Secs(Pattern2)] [==>304.0 Secs(Pattern1)] 450 Secs(608Secs) [==>190.0 Secs(Pattern2)] [==>190.0 Secs(Pattern1)] 450 Secs(380Secs) [==>190.0 Secs(Pattern2)] [==>190.0 Secs(Pattern1)] 450 Secs(380Secs) Orbit [1] [1] [1] [1] [1] Proposal 15942-A1-2,firstepoch(01)ArethemostmassivestarsinLocalGrouptruly single? Orbit Structure 6 Proposal 15942-A1-2,secondepoch(02)ArethemostmassivestarsinLocalGroup trulysingle? Fixed Targets Patterns Visit Description=[WOLF RAYET-WN] Category=STAR Brightest clusterstarinslitR136a1(BAT99108).VEGAV=12.28 Crowther etal.2016). Comments: CenterbetweenR136a1andR136a2(BAT99108109),-1.862 sec(RA)and2.975(DEC)offsetrelativetoBrey84(Melnick34).DeterminedfromF336WWFC3imageofR136(deMarchietal.2011, (6) Extended=NO Description=[WOLF RAYET-WN] Category=STAR acquision duetoseverecrowdingwithinR136itself.CoordinatesofMk34 in*astrometricallty-uncorrecred"WFCimage:'053844.2416','-69065.930' Comments: VEGAMAGPhotometryfromWFC3F555WEarlyReleaseObervation IB6WD6050(DeMarchietal.2011).ICRSastrometryofMelnick34fromGaiaDR2(Gaia4657685534828257792).Usedfor (5) # (4) # Special Requirements:SCHED70%;ORIENT106DTO106D;286D286AFTER01BY50D230 Scientific Instruments:STIS/CCD Diagnostic Status:NoDiagnostics Proposal 15942,A1-2,secondepoch(02),implementation A1-2 BAT99-116-MK-34 Name Line Spacing= Point Spacing=0.35546 Number OfPoints=2 Purpose=DITHER Pattern Type=STIS-ALONG-SLIT Primary Pattern Dec Offset:2.97Arcsec RA Offset:-1.86Secs Offset fromBAT99-116-MK-34 Equinox: J2000 Dec: -69066.01(-69.10167d) RA: 053844.2508(84.6843783d) Target Coordinates Center Pattern=false Angle BetweenSides= Pattern Orientation=90.0 Coordinate Frame=POS-TARG Epoch ofPosition:2000 Proper MotionDec:0.753mas/yr Proper MotionRA:1.874mas/yr Targ. Coord.Corrections Secondary Pattern 7 V=12.28 B-V=0.25 V=13.09+/-0.01 Fluxes Offset Position(A1-2) Reference Frame:ICRS Miscellaneous (3), (4),(5) Exposures Thu Mar0517:00:37GMT2020 Proposal 15942-A1-2,secondepoch(02)ArethemostmassivestarsinLocalGroup trulysingle? Exposures ETC runsperformedforexposuretimesinfirstphaseIIsubmission.The exposure timesinthssecondsubmissionareslightlyshorter,S/Nandotherparameterseasilyscalable. Comments: ETCrunforfainterR136a2:1367422 5 ETC runsperformedforexposuretimesinfirstphaseIIsubmission.The exposure timesinthssecondsubmissionareslightlyshorter,S/Nandotherparameterseasilyscalable. Comments: ETCrunforfainterR136a2:1367279 4 ETC runsperformedforexposuretimesinfirstphaseIIsubmission.The exposure timesinthssecondsubmissionareslightlyshorter,S/Nandotherparameterseasilyscalable. Comments: ETCrunforfainterR136a2:1367278 3 on level. Comments: PeakuponMelnick34foraccuratepositioningpriortooffset. ETCpredicts58,000e-fromsourcein0.5secexposurethrough52x0.1apertureforMelnick34(V=13.09),orderofmagnitudebelowsaturati 2 Comments: ETCpredictsS/N=174for1secexposurethroughF28X50LPapertureMelnick34(V=13.09). 1 # (1367603) (1367602) (1367600) (198019) k 34 Acq-peak-M (197926) Acq Mk34 (ETC Run) Label (6) A1-2 (6) A1-2 (6) A1-2 34 (5) BAT99-116-MK- 34 (5) BAT99-116-MK- Target STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACQ/PEAK,52X0.1 STIS/CCD, ACQ,F28X50LP Config,Mode,Aperture 4961 A G430M 4706 A G430M 3936 A G430M MIRROR MIRROR Spectral Els. CR-SPLIT=NO CR-SPLIT=NO CR-SPLIT=NO Opt. Params. 8 Special Reqs. Groups h (02)(4) n A1-2,secondepoc Pattern 4,Exps5-5i h (02)(4) n A1-2,secondepoc Pattern 4,Exps4-4i h (02)(4) n A1-2,secondepoc Pattern 4,Exps3-3i [==>] 0.5 Secs(0.5Secs) [==>] 1 Secs(1Secs) Exp. Time(Total)/[ActualDur.] [==>311.0 Secs(Pattern2)] [==>311.0 Secs(Pattern1)] 450 Secs(622Secs) [==>197.0 Secs(Pattern2)] [==>197.0 Secs(Pattern1)] 450 Secs(394Secs) [==>197.0 Secs(Pattern2)] [==>197.0 Secs(Pattern1)] 450 Secs(394Secs) Orbit [1] [1] [1] [1] [1] Proposal 15942-A1-2,secondepoch(02)ArethemostmassivestarsinLocalGroup trulysingle? Orbit Structure 9 Proposal 15942-A1-2,thirdepoch(03)ArethemostmassivestarsinLocalGroup trulysingle? Fixed Targets Patterns Visit Description=[WOLF RAYET-WN] Category=STAR Brightest clusterstarinslitR136a1(BAT99108).VEGAV=12.28 Crowther etal.2016). Comments: CenterbetweenR136a1andR136a2(BAT99108109),-1.862 sec(RA)and2.975(DEC)offsetrelativetoBrey84(Melnick34).DeterminedfromF336WWFC3imageofR136(deMarchietal.2011, (6) Extended=NO Description=[WOLF RAYET-WN] Category=STAR acquision duetoseverecrowdingwithinR136itself.CoordinatesofMk34 in*astrometricallty-uncorrecred"WFCimage:'053844.2416','-69065.930' Comments: VEGAMAGPhotometryfromWFC3F555WEarlyReleaseObervation IB6WD6050(DeMarchietal.2011).ICRSastrometryofMelnick34fromGaiaDR2(Gaia4657685534828257792).Usedfor (5) # (4) # Special Requirements:SCHED70%;ORIENT106DTO106D;286D286AFTER01BY250D540 Scientific Instruments:STIS/CCD Diagnostic Status:NoDiagnostics Proposal 15942,A1-2,thirdepoch(03),implementation A1-2 BAT99-116-MK-34 Name Line Spacing= Point Spacing=0.35546 Number OfPoints=2 Purpose=DITHER Pattern Type=STIS-ALONG-SLIT Primary Pattern Dec Offset:2.97Arcsec RA Offset:-1.86Secs Offset fromBAT99-116-MK-34 Equinox: J2000 Dec: -69066.01(-69.10167d) RA: 053844.2508(84.6843783d) Target Coordinates Center Pattern=false Angle BetweenSides= Pattern Orientation=90.0 Coordinate Frame=POS-TARG Epoch ofPosition:2000 Proper MotionDec:0.753mas/yr Proper MotionRA:1.874mas/yr Targ. Coord.Corrections Secondary Pattern 10 V=12.28 B-V=0.25 V=13.09+/-0.01 Fluxes Offset Position(A1-2) Reference Frame:ICRS Miscellaneous (3), (4),(5) Exposures Thu Mar0517:00:38GMT2020 Proposal 15942-A1-2,thirdepoch(03)ArethemostmassivestarsinLocalGroup trulysingle? Exposures ETC runsperformedforexposuretimesinfirstphaseIIsubmission.The exposure timesinthssecondsubmissionareslightlyshorter,S/Nandotherparameterseasilyscalable. Comments: ETCrunforfainterR136a2:1367422 5 ETC runsperformedforexposuretimesinfirstphaseIIsubmission.The exposure timesinthssecondsubmissionareslightlyshorter,S/Nandotherparameterseasilyscalable. Comments: ETCrunforfainterR136a2:1367279 4 ETC runsperformedforexposuretimesinfirstphaseIIsubmission.The exposure timesinthssecondsubmissionareslightlyshorter,S/Nandotherparameterseasilyscalable. Comments: ETCrunforfainterR136a2:1367278 3 on level. Comments: PeakuponMelnick34foraccuratepositioningpriortooffset. ETCpredicts58,000e-fromsourcein0.5secexposurethrough52x0.1apertureforMelnick34(V=13.09),orderofmagnitudebelowsaturati 2 Comments: ETCpredictsS/N=174for1secexposurethroughF28X50LPapertureMelnick34(V=13.09). 1 # (1367603) (1367602) (1367600) (198019) k 34 Acq-peak-M (197926) Acq Mk34 (ETC Run) Label (6) A1-2 (6) A1-2 (6) A1-2 34 (5) BAT99-116-MK- 34 (5) BAT99-116-MK- Target STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACQ/PEAK,52X0.1 STIS/CCD, ACQ,F28X50LP Config,Mode,Aperture 4961 A G430M 4706 A G430M 3936 A G430M MIRROR MIRROR Spectral Els. CR-SPLIT=NO CR-SPLIT=NO CR-SPLIT=NO Opt. Params. 11 Special Reqs. Groups 03) (4) n A1-2,thirdepoch( Pattern 4,Exps5-5i 03) (4) n A1-2,thirdepoch( Pattern 4,Exps4-4i 03) (4) n A1-2,thirdepoch( Pattern 4,Exps3-3i [==>] 0.5 Secs(0.5Secs) [==>] 1 Secs(1Secs) Exp. Time(Total)/[ActualDur.] [==>311.0 Secs(Pattern2)] [==>311.0 Secs(Pattern1)] 450 Secs(622Secs) [==>197.0 Secs(Pattern2)] [==>197.0 Secs(Pattern1)] 450 Secs(394Secs) [==>197.0 Secs(Pattern2)] [==>197.0 Secs(Pattern1)] 450 Secs(394Secs) Orbit [1] [1] [1] [1] [1] Proposal 15942-A1-2,thirdepoch(03)ArethemostmassivestarsinLocalGroup trulysingle? Orbit Structure 12 Proposal 15942-A3-c,firstepoch(04)ArethemostmassivestarsinLocalGroup truly single? Exposures Fixed Targets Patterns Visit ETC runs performedforexposure timesinfirst phaseIIsubmission. Theexposure timesinthssecond submissionare slightly shorter,S/N andotherparameters areeasilyscalable. Comments: ETCrunforfainter R136c:1367434 5 ETC runsperformed forexposuretimesinfirstphaseII submission.Theexposuretimesin ths secondsubmissionareslightlyshorter, S/Nandotherparametersare easilyscalable. Comments: ETCrun forfainterR136c:1367433 4 ETC runsperformedforexposuretimes infirstphaseIIsubmission.Theexposuretimesthssecondsubmission areslightlyshorter,S/Nandotherparameterseasilyscalable. Comments: ETCrunforfainterR136c: 1367432 3 2 1 # Description=[WOLF RAYET-WN] Category=STAR Brightest clusterstarinslitR136C(BAT99112).VEGAV=12.86 2011, Crowtheretal.2016). Comments: CenterbetweenR136a3andR136c(BAT99106112),-1.62935 sec(RA)and1.6715(DEC)offsetrelativetoBrey84(Melnick34).DeterminedfromF336WWFC3imageofR136(deMarchietal. (7) Extended=NO Description=[WOLF RAYET-WN] Category=STAR acquision duetoseverecrowdingwithinR136itself.CoordinatesofMk34 in*astrometricallty-uncorrecred"WFCimage:'053844.2416','-69065.930' Comments: VEGAMAGPhotometryfromWFC3F555WEarlyReleaseObervation IB6WD6050(DeMarchietal.2011).ICRSastrometryofMelnick34fromGaiaDR2(Gaia4657685534828257792).Usedfor (5) # (4) # Special Requirements:SCHED90%;ORIENT162.2DTO162.2D;342.2D342.2D Scientific Instruments:STIS/CCD Diagnostic Status:NoDiagnostics Proposal 15942,A3-c,firstepoch(04),implementation (1367436) (1367438) (1367439) (198019) k 34 Acq-peak-M (197926) Acq Mk34 (ETC Run) Label A3-C BAT99-116-MK-34 Name Line Spacing= Point Spacing=0.35546 Number OfPoints=2 Purpose=DITHER Pattern Type=STIS-ALONG-SLIT Primary Pattern (7) A3-C (7) A3-C (7) A3-C 34 (5) BAT99-116-MK- 34 (5) BAT99-116-MK- Target Dec Offset:1.82Arcsec RA Offset:-1.64Secs Offset fromBAT99-116-MK-34 Equinox: J2000 Dec: -69066.01(-69.10167d) RA: 053844.2508(84.6843783d) Target Coordinates STIS/CCD, ACCUM, 52X0.1 STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACQ/PEAK,52X0.1 STIS/CCD, ACQ,F28X50LP Config,Mode,Aperture Center Pattern=false Angle BetweenSides= Pattern Orientation=90.0 Coordinate Frame=POS-TARG MIRROR Spectral Els. 4961 A G430M 4706 A G430M 3936 A G430M MIRROR Epoch ofPosition:2000 Proper MotionDec:0.753mas/yr Proper MotionRA:1.874mas/yr Targ. Coord.Corrections Secondary Pattern Opt. Params. CR-SPLIT=NO CR-SPLIT=NO CR-SPLIT=NO 13 Special Reqs. V=12.86 B-V=0.25 V=13.09+/-0.01 Fluxes 4) (4) n A3-c,firstepoch (0 Pattern 4,Exps5-5 i 4) (4) n A3-c,firstepoch(0 Pattern 4,Exps4-4i 4) (4) n A3-c,firstepoch(0 Pattern 4,Exps3-3i Groups [==>346.0 Secs(Pattern 2)] [==>346.0 Secs(Pattern 1)] 450 Secs(692Secs) [==>146.0 Secs(Pattern 2)] [==>146.0 Secs(Pattern1)] 450 Secs(292Secs) [==>146.0 Secs(Pattern2)] [==>146.0 Secs(Pattern1)] 450 Secs(292Secs) [==>] 0.5 Secs(0.5Secs) [==>] 1 Secs(1Secs) Exp. Time(Total)/[ActualDur.] Offset Position(A3-C) Reference Frame:ICRS Miscellaneous (3), (4),(5) Exposures Thu Mar0517:00:38GMT2020 Orbit [1] [1] [1] [1] [1] Proposal 15942-A3-c,firstepoch(04)ArethemostmassivestarsinLocalGroup truly single? Orbit Structure 14 Proposal 15942-A3-c,secondepoch(05)ArethemostmassivestarsinLocalGroup trulysingle? Exposures Fixed Targets Patterns Visit ETC runs performedforexposure timesinfirst phaseIIsubmission. Theexposure timesinthssecond submissionare slightly shorter,S/N andotherparameters areeasilyscalable. Comments: ETCrunforfainter R136c:1367434 5 ETC runsperformed forexposuretimesinfirstphaseII submission.Theexposuretimesin ths secondsubmissionareslightlyshorter, S/Nandotherparametersare easilyscalable. Comments: ETCrun forfainterR136c:1367433 4 ETC runsperformedforexposuretimes infirstphaseIIsubmission.Theexposuretimesthssecondsubmission areslightlyshorter,S/Nandotherparameterseasilyscalable. Comments: ETCrunforfainterR136c: 1367432 3 2 1 # Description=[WOLF RAYET-WN] Category=STAR Brightest clusterstarinslitR136C(BAT99112).VEGAV=12.86 2011, Crowtheretal.2016). Comments: CenterbetweenR136a3andR136c(BAT99106112),-1.62935 sec(RA)and1.6715(DEC)offsetrelativetoBrey84(Melnick34).DeterminedfromF336WWFC3imageofR136(deMarchietal. (7) Extended=NO Description=[WOLF RAYET-WN] Category=STAR acquision duetoseverecrowdingwithinR136itself.CoordinatesofMk34 in*astrometricallty-uncorrecred"WFCimage:'053844.2416','-69065.930' Comments: VEGAMAGPhotometryfromWFC3F555WEarlyReleaseObervation IB6WD6050(DeMarchietal.2011).ICRSastrometryofMelnick34fromGaiaDR2(Gaia4657685534828257792).Usedfor (5) # (4) # Special Requirements:SCHED50%;ORIENT162.2DTO162.2D;342.2D342.2AFTER04BY50D230 Scientific Instruments:STIS/CCD Diagnostic Status:NoDiagnostics Proposal 15942,A3-c,secondepoch(05),implementation (1367436) (1367438) (1367439) (198019) k 34 Acq-peak-M (197926) Acq Mk34 (ETC Run) Label A3-C BAT99-116-MK-34 Name Line Spacing= Point Spacing=0.35546 Number OfPoints=2 Purpose=DITHER Pattern Type=STIS-ALONG-SLIT Primary Pattern (7) A3-C (7) A3-C (7) A3-C 34 (5) BAT99-116-MK- 34 (5) BAT99-116-MK- Target Dec Offset:1.82Arcsec RA Offset:-1.64Secs Offset fromBAT99-116-MK-34 Equinox: J2000 Dec: -69066.01(-69.10167d) RA: 053844.2508(84.6843783d) Target Coordinates STIS/CCD, ACCUM, 52X0.1 STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACQ/PEAK,52X0.1 STIS/CCD, ACQ,F28X50LP Config,Mode,Aperture Center Pattern=false Angle BetweenSides= Pattern Orientation=90.0 Coordinate Frame=POS-TARG MIRROR Spectral Els. 4961 A G430M 4706 A G430M 3936 A G430M MIRROR Epoch ofPosition:2000 Proper MotionDec:0.753mas/yr Proper MotionRA:1.874mas/yr Targ. Coord.Corrections Secondary Pattern Opt. Params. CR-SPLIT=NO CR-SPLIT=NO CR-SPLIT=NO 15 Special Reqs. V=12.86 B-V=0.25 V=13.09+/-0.01 Fluxes h (05)(4) n A3-c,secondepoc Pattern 4,Exps5-5 i h (05)(4) n A3-c,secondepoc Pattern 4,Exps4-4i h (05)(4) n A3-c,secondepoc Pattern 4,Exps3-3i Groups [==>387.0 Secs(Pattern 2)] [==>387.0 Secs(Pattern 1)] 450 Secs(774Secs) [==>187.0 Secs(Pattern 2)] [==>187.0 Secs(Pattern1)] 450 Secs(374Secs) [==>187.0 Secs(Pattern2)] [==>187.0 Secs(Pattern1)] 450 Secs(374Secs) [==>] 0.5 Secs(0.5Secs) [==>] 1 Secs(1Secs) Exp. Time(Total)/[ActualDur.] Offset Position(A3-C) Reference Frame:ICRS Miscellaneous (3), (4),(5) Exposures Thu Mar0517:00:38GMT2020 Orbit [1] [1] [1] [1] [1] Proposal 15942-A3-c,secondepoch(05)ArethemostmassivestarsinLocalGroup trulysingle? Orbit Structure 16 Proposal 15942-A3-c,thirdepoch(06)ArethemostmassivestarsinLocalGroup trulysingle? Exposures Fixed Targets Patterns Visit ETC runs performedforexposure timesinfirst phaseIIsubmission. Theexposure timesinthssecond submissionare slightly shorter,S/N andotherparameters areeasilyscalable. Comments: ETCrunforfainter R136c:1367434 5 ETC runsperformed forexposuretimesinfirstphaseII submission.Theexposuretimesin ths secondsubmissionareslightlyshorter, S/Nandotherparametersare easilyscalable. Comments: ETCrun forfainterR136c:1367433 4 ETC runsperformedforexposuretimes infirstphaseIIsubmission.Theexposuretimesthssecondsubmission areslightlyshorter,S/Nandotherparameterseasilyscalable. Comments: ETCrunforfainterR136c: 1367432 3 2 1 # Description=[WOLF RAYET-WN] Category=STAR Brightest clusterstarinslitR136C(BAT99112).VEGAV=12.86 2011, Crowtheretal.2016). Comments: CenterbetweenR136a3andR136c(BAT99106112),-1.62935 sec(RA)and1.6715(DEC)offsetrelativetoBrey84(Melnick34).DeterminedfromF336WWFC3imageofR136(deMarchietal. (7) Extended=NO Description=[WOLF RAYET-WN] Category=STAR acquision duetoseverecrowdingwithinR136itself.CoordinatesofMk34 in*astrometricallty-uncorrecred"WFCimage:'053844.2416','-69065.930' Comments: VEGAMAGPhotometryfromWFC3F555WEarlyReleaseObervation IB6WD6050(DeMarchietal.2011).ICRSastrometryofMelnick34fromGaiaDR2(Gaia4657685534828257792).Usedfor (5) # (4) # Special Requirements:SCHED30%;ORIENT162.2DTO162.2D;342.2D342.2AFTER04BY250D540 Scientific Instruments:STIS/CCD Diagnostic Status:NoDiagnostics Proposal 15942,A3-c,thirdepoch(06),implementation (1367436) (1367438) (1367439) (198019) k 34 Acq-peak-M (197926) Acq Mk34 (ETC Run) Label A3-C BAT99-116-MK-34 Name Line Spacing= Point Spacing=0.35546 Number OfPoints=2 Purpose=DITHER Pattern Type=STIS-ALONG-SLIT Primary Pattern (7) A3-C (7) A3-C (7) A3-C 34 (5) BAT99-116-MK- 34 (5) BAT99-116-MK- Target Dec Offset:1.82Arcsec RA Offset:-1.64Secs Offset fromBAT99-116-MK-34 Equinox: J2000 Dec: -69066.01(-69.10167d) RA: 053844.2508(84.6843783d) Target Coordinates STIS/CCD, ACCUM, 52X0.1 STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACCUM,52X0.1 STIS/CCD, ACQ/PEAK,52X0.1 STIS/CCD, ACQ,F28X50LP Config,Mode,Aperture Center Pattern=false Angle BetweenSides= Pattern Orientation=90.0 Coordinate Frame=POS-TARG MIRROR Spectral Els. 4961 A G430M 4706 A G430M 3936 A G430M MIRROR Epoch ofPosition:2000 Proper MotionDec:0.753mas/yr Proper MotionRA:1.874mas/yr Targ. Coord.Corrections Secondary Pattern Opt. Params. CR-SPLIT=NO CR-SPLIT=NO CR-SPLIT=NO 17 Special Reqs. V=12.86 B-V=0.25 V=13.09+/-0.01 Fluxes 06) (4) n A3-c,thirdepoch ( Pattern 4,Exps5-5 i 06) (4) n A3-c,thirdepoch( Pattern 4,Exps4-4i 06) (4) n A3-c,thirdepoch( Pattern 4,Exps3-3i Groups [==>421.0 Secs(Pattern 2)] [==>421.0 Secs(Pattern 1)] 450 Secs(842Secs) [==>221.0 Secs(Pattern 2)] [==>221.0 Secs(Pattern1)] 450 Secs(442Secs) [==>221.0 Secs(Pattern2)] [==>221.0 Secs(Pattern1)] 450 Secs(442Secs) [==>] 0.5 Secs(0.5Secs) [==>] 1 Secs(1Secs) Exp. Time(Total)/[ActualDur.] Offset Position(A3-C) Reference Frame:ICRS Miscellaneous (3), (4),(5) Exposures Thu Mar0517:00:38GMT2020 Orbit [1] [1] [1] [1] [1] Proposal 15942-A3-c,thirdepoch(06)ArethemostmassivestarsinLocalGroup trulysingle? Orbit Structure 18