0Assigned ID: 229
----- Attempting Submission 1 (Thu Apr 10 18:41:08 GMT 2014) -----
HST Phase I Proposal 229 (WOs.apt) successfully submitted.
----- Attempting Submission 2 (Thu Apr 10 18:46:06 GMT 2014) -----INEFFICIENT ORDERING OF FP-POS POSITIONSRevision of 13781 based on correspondence with Nolan Walborn. Visit 2 now uses dispersed light for the ACQ of Sand 2 rather than Mirror B.
For Visit 3 I removed the dispersed light peakups, as these were unnecessary. (I also slight rebalanced the exposure times in Visit 3.)-2144232956----- Attempting Submission 1 (Mon Jul 07 15:15:32 GMT 2014) -----
HST Phase II Proposal 13781 (WOPII.apt) successfully submitted.
----- Attempting Submission 2 (Tue Jul 08 23:00:48 GMT 2014) -----
HST Phase II Proposal 13781 (WOPII.apt) successfully submitted.
----- Attempting Submission 3 (Fri Jul 11 23:39:18 GMT 2014) -----
HST Phase II Proposal 13781 (WOPII.apt) successfully submitted.
----- Attempting Submission 4 (Sat Jul 12 13:40:54 GMT 2014) -----
HST Phase II Proposal 13781 (WOPII.apt) successfully submitted.
----- Attempting Submission 5 (Tue Jul 15 18:52:16 GMT 2014) -----
HST Phase II Proposal 13781 (WOPII.apt) successfully submitted.
----- Attempting Submission 6 (Thu Jul 17 18:34:21 GMT 2014) -----
HST Phase II Proposal 13781 (WOPII.apt) successfully submitted.
----- Attempting Submission 7 (Thu Aug 21 03:37:43 GMT 2014) -----
HST Phase II Proposal 13781 (WOSTIS.apt) successfully submitted.
----- Attempting Submission 8 (Sat Sep 27 19:22:22 GMT 2014) -----The warning "Inefficient ordering of FP-POS" turns out to be a bug in APT: see the resolution to Help issue 6362.
Justin's reply stated that APT is failing to recognize that I switched targets and that there is nothing
wrong.WO-Type Wolf-Rayet Stars: the Last Hurrah of the Most Massive Stars?WO-type Wolf-Rayet (WR) stars are considered the final evolutionary stage of the highest mass stars, immediate precursors to Type Ic (He-poor) core-collapse supernovae. These WO stars are rare, and until recently only 6 were known. Our knowledge about their physical properties is mostly based on a single object, Sand 2 in the LMC. It was the only non-binary WO star both bright and unreddened enough that its FUV and NUV spectra could be obtained by FUSE and HST/FOS. A non-LTE analysis showed that Sand 2 is very hot and its (C+O)/He abundance ratio is higher than that found in WC-type WRs, suggesting it is indeed highly evolved. However, the O VI resonance doublet in the FUV required a considerably cooler temperature (120,000 K) model than did the optical O VI lines (170,000 K). Further, the enhanced chemical abundances did not match the predictions of stellar evolutionary models. Another non-LTE study found a 3x higher (C+O)/He abundance ratio and a cooler temperature. We have recently discovered two other bright, single, and lightly reddened WOs in the LMC, allowing us to take a fresh look at these important objects. Our newly found WOs span a range in excitation type, from WO2 to WO4. Sand 2 is intermediate (WO3). We will use COS and STIS to obtain FUV and NUV spectra. These UV data will be combined with ground-based optical and NIR Magellan spectra for a detailed analysis with CMFGEN with the latest atomic data. Knowing the degree of chemical evolution of these WO stars is crucial to determining their evolutionary status, and thus in understanding the final stages of the most massive stars.Overview: We will observe three WO-type Wolf-Rayet stars: LH41-1042, LMC195-1, and Sand2 as follows:
Sand 3: 3 orbit COS with two G130M settings. All exposures take place at all four FP-POS in order to improve the signal-to-noise.
LH41-1042 and LMC195-1. These stars are located in the Lucke-Hodge 41 region, and are separated from each other by 8-arcsec. (aWe will obtain a 3-orbit observation with COS G130M/1096 to obtain the critical OVI 1032,38 line. Because of the close proximity of a B0.2 supergiant (which a F225W WFC3 exposure shows to be a 0.3" separated double) there are safety concerns with the other FUV settings, and so we then devote a 4-orbit visit with STIS to obtain
both FUV and NUV spectra.
Acqusition: The acquisition of Sand 2 is straightforward, as the region is not crowded; there are 18-19th mag stars 10" away. Sand 2 is in the GSC-II and we use those coordinates. We use the PSA and Mirror B.
The field containing LH41-1042 and LMC195-1 is somewhat crowded with bright blue stars and we do the acquistion in dispersed light throught he PSA with COS on a nearby offset star (LH41-1042, a V=13.28 B1 I).
Science exposures: We are fortunate that Sand 2 has been previously observed with FUSE and HST/FOS, and hence we know the observed fluxes. We use this spectrum to estimate exposure times, and scale for the other two stars using the F225W fluxes measured from our WFC3 image.
Sand 2 (FOS fluxes averaged over the F225W bandpass): 1.3E-14
LH41-1042 F225W bandpass: 4.0E-14
LMC195-1 F225W bandpass: 1.4E-14
Safety concerns: the Lucke-Hodge 41 field containing LMC195-1 and LH41-1042 is crowded with bright blue stars. Fortunately, we have two excellent resources: (a) All of the potentially dangerous stars have spectral types, either published or from our own recent Magellan data. (b) We have a WFC3 F225W exposure that allows us to measure the NUV flux of potential hazards. Full details have been forward to Dr. Nolan Walborn on July 14th, along with a figure.
Using a the combined flux of 4.27E-13 for this B0.2I composite, an effective wavelength of 2374A, adopting the B1V Kurucz model (which should have a similar temperature to that of a B0.2 supergiant), and using E(B-V)=0.13 with an LMC reddening law, we find that the G130M/1096 exposures should be safe (ETC 620478) but that other COS FUV exposures would not be.
There are no safety concerns with this star with STIS using the 0.2"x0.2" aperture as only
one of the two components could fall into the aperture at a given time.HOT STARSDefaultfalsetruefalsefalsefalseSUPPORTEDEXT-STARWOLF RAYETWOLF RAYET - WCCoordinates measured from WFC3 image iby705010_drz.fits[SCI]J2000J2000Flux in F225W filter is 4.0E-14EXT-STARWOLF RAYETWOLF RAYET - WCCoordinates measured from WFC3 image iby705010_drz.fits[SCI]J2000J2000Flux in F225W filter is 1.4E-14EXT-STARWOLF RAYETWOLF RAYET - WCCoordinates are from the GSC-II.J2000J2000B-V=+0.42, U-B=-1.17. Flux averaged over F225W bandpass is 1.3E-14EXT-STARB0-B2 III-ICoordinates measured from WFC3 image iby705010_drz.fitsJ2000J2000B-V=-0.16, E(B-V)=0.13, Flux in F225W is 1.4E-13COS/FUVSpectroscopicNoNoG130M1096COS/FUVSpectroscopicNoNoG130M1300COS/FUVSpectroscopicNoNoG160M1600COS/FUVSpectroscopicNoNoG160M1623COS/NUVSpectroscopicNoNoG230L3360COS/NUVSpectroscopicNoNoG230L2950COS/FUVSpectroscopicNoNoG130M1096COS/FUVSpectroscopicNoNoG130M1300COS/FUVSpectroscopicNoNoG160M1600COS/FUVSpectroscopicNoNoG160M1623COS/NUVSpectroscopicNoNoG230L3360COS/NUVSpectroscopicNoNoG230L2950COS/FUVSpectroscopicNoNoG130M1096COS/FUVSpectroscopicNoNoG130M1300COS/FUVSpectroscopicNoNoG160M1600COS/FUVSpectroscopicNoNoG160M1623COS/NUVSpectroscopicNoNoG230L3360COS/NUVSpectroscopicNoNoG230L2950COS/NUVImagingNoNoMIRRORAThe scheduling data was generated by CASM 22.2.CASM was run in Phase II mode./private/var/folders/mv/gvc101b94zz4pyyn_xy8m8tm0000gn/T/OPVisit3020714771562711057.xml(Tic-Visit
:proposal-id 13781
:visit-id "01"
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:trans-version "20140605"
:date "27-Sep-2014 12:06:17.0"
:trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 487168
:tdrss-contact-duration 0
:coron NIL
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(Tic-Obset
:proposal-id 13781
:visit-id "01"
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(Tic-Orbit
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:visit-id "01"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 3190
:al-overhead-at-end 0
:internal-dur-at-end 86
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3572
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(Tic-Orbit
:proposal-id 13781
:visit-id "01"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 3350
:al-overhead-at-end 0
:internal-dur-at-end 105
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3572
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(Tic-Orbit
:proposal-id 13781
:visit-id "01"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 3350
:al-overhead-at-end 0
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:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3572
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)true30Exposure time is 0.3sec using a Kurucz B1V model normalized to a V magnitude of (13.28 (ETC 631143), and is 0.2 sec when normalized to a F225W flux of 1.4E-14.Expect a S/N of 8 per spectral resolution element at 1035A.Expect a SN of 7.7 per spectral resolution element at 1035A.The scheduling data was generated by CASM 22.2.CASM was run in Phase II mode./private/var/folders/mv/gvc101b94zz4pyyn_xy8m8tm0000gn/T/OPVisit3403493592472686781.xml(Tic-Visit
:proposal-id 13781
:visit-id "02"
:proposal-version -1
:trans-version "20140605"
:date "27-Sep-2014 12:06:19.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 348128
:tdrss-contact-duration 0
:coron NIL
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(Tic-Obset
:proposal-id 13781
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
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(Tic-Orbit
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:visit-id "02"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 3237
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:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
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(Tic-Orbit
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(Tic-Orbit
:proposal-id 13781
:visit-id "02"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 3350
:al-overhead-at-end 0
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)true30Expect to reach a SN of 2.5 per FP at 1170 assuming a continuum flux of 2E-14Expect to reach a SN of 2 in 4000 sec (total) of integration at 1032A./Users/massey/Dropbox/cycle22/OP-cache/WOSTISrev-v03.xmlThe scheduling data was generated by CASM 22.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13781
:visit-id "03"
:proposal-version -1
:trans-version "20140605"
:date "26-Sep-2014 15:03:10.0"
: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 383280
:tdrss-contact-duration 0
:coron NIL
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(Tic-Obset
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:obset-id "03"
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(Tic-Orbit
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:orbit-number 1
:pcs-time 333
:si-vis-utilization 3238
: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 3572
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13781
:visit-id "03"
:orbit-number 2
:pcs-time 222
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:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3572
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13781
:visit-id "03"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 3350
:al-overhead-at-end 250
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:dark-offset NIL
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:low-sky "N"
:pcs-visibility 3572
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)true30Expect a S/N of approx 70 at 1400AExpect a S/N of about 60 at 2200AExpected S/N of 70 at 1400AExpected S/N of 60 at 2200A