0Assigned ID: 31
----- Attempting Submission 1 (Wed Apr 02 17:49:33 GMT 2014) -----
HST Phase I Proposal 31 (SMC_GO.apt) successfully submitted.Revision after eliminating previously unrecognized duplications.74837962----- Attempting Submission 1 (Thu Jul 17 20:46:44 GMT 2014) -----
HST Phase II Proposal 13778 (SMC_GO.apt) successfully submitted.
----- Attempting Submission 2 (Wed Jul 23 16:52:44 GMT 2014) -----Using ISM abundances in the SMC to Correct for Element Depletions by Dust in QSO Absorption Line SystemsThe availability of 10-m class telescopes with high resolution echelle spectrographs has enabled astronomers to measure accurately the gas-phase abundances of various elements in QSO absorption line systems at high redshifts. These systems offer insights on the chemical evolution of galaxies (and their nearby environments) in their early stages of development. However, in order to obtain total abundances the observations need to be corrected for the depletions caused by the formation of dust, and traditionally people have done so by using the depletion patterns seen in our own Galaxy. There is now evidence that indicates that such patterns in low-metallicity systems differ from those of our Galaxy and thus the corrections may be misleading. The aim of our proposed HST observations is to measure the gas-phase abundances toward stars in the Small Magellanic Cloud, which is a low-metallicity dwarf galaxy where there exist good measurements of stellar comparison abundances. We plan to record ISM absorption features from STIS medium-resolution echelle spectra for 14 stars in the SMC that are known to have varying levels of depletion, so that we can derive the gas-phase abundance patterns of the elements Ni, Fe, Cr, Mn, Si, Mg, Ge, Kr, Zn, and perhaps P.For our choice of targets, we have selected stars that are reasonably bright, have projected rotation velocities v sin i > 60 km/s, have had their interstellar Ti abundances measured by Welty & Crowther (2010) and have had H I and H2 column densities listed by Welty, et al. (2012). For these sight lines, the depletions of Ti range from a mild value of -0.76 to an extreme of -1.73 dex. We feel that it is important to include Ti in our study, because it's an alpha element that has a depletion behavior similar to those of Fe-peak elements (in our Galaxy). The radial velocity of interstellar gas in the SMC is at about +150 km/s, which is well removed from the typical velocities of gas in our galaxy.
The locations of the targets are shown in Fig. 3 of the Phase I proposal . They have visual magnitudes that range between 11.85 to 14.25, so they clearly will not violate the count rate limits for the STIS MAMA detector operating in the echelle modes. Acquisitions should be straightforward, since there are no other stars that are in close proximity in the sky to our desired targets. The unocculted time available for each orbit at the location of the SMC is 61 minutes. (CVZ observations are not practical: only half of the targets are candidates for CVZ observations, and the visit planner reveals that for those targets only one day in the year is available.) After subtracting acquisition and instrument setup times, we expect to have 2460 seconds of integration time during the first orbit of a visit and 2900 seconds of time in subsequent orbits of the same visit.
Our strategy is to achieve a minimum signal-to-noise ratio (SNR) per resolution element of 20 over the wavelength range 1605-2673A at a wavelength resolving power R = 30,000. These observations will allow us to obtain accurate measurements for the weak lines of Si II, Ni II, Fe II, Zn II, Cr II and Mn II. We will achieve this by observing the targets with the STIS E230M echelle mode with two different central wavelength settings, one centered at 1978A and the other at 2269A. Over a region of overlap, 1865-2382A, we should obtain a minimum SNR = sqrt{2} X 20. For a few targets, the quantization of observing time into integral numbers of orbits will result in our achieving SNRs slightly better than our specification.
For coverage of the lines of Kr I, Ge II, and Mg II, plus doubling the coverage of Fe II and Ni II, we plan to observe the wavelength range 1123-1717A with the E140M echelle mode of STIS, again with the goal of achieving a minimum SNR = 20. For some stars, AzVs 18, 26, 47, 80, 95, 456 and Sk 191, existing data in the MAST archive have coverage in this wavelength region at a somewhat reduced SNR (see Fig. 4 of the Phase I proposal); we will not reobserve these wavelengths, even though the SNR is somewhat below our desired minimum. For two stars, AzVs 207 and 476, we will omit the E140M observations because the orbit requirements are too costly. For another star, HD5980, comprehensive observations have already been taken that exceed our minimum objectives by a large margin over all wavelengths (see the top right panel of Fig. 4), hence this star will not be observed at all. However, we plan to analyze archival data for this star in the same manner that we treat the cases that will be observed in this program.
Table 1 of the Phase I proposal lists the transitions that we will utilize for various elements in their favored ionization states for H I regions. We plan to analyze the absorption features using the apparent optical depth method (AOD) to derive the column densities N=10^{14.576} integral tau(v)/(f*lambda)dv. For pairs of moderately strong features that yield different results (caused by unresolved saturations, which result in the weak lines showing larger column densities than the strong ones), we plan to use the correction scheme outlined by Jenkins (1996) to compensate for the effects of saturation. (This is better than using the weaker line and declaring the result to be a lower limit for the column density.)ISM IN EXTERNAL GALAXIES12RegularfalsetruefalsefalsefalseSUPPORTEDEXT-STARB0-B2 III-IGSC2 catalog shows another point source that is 5.5 arc sec away from the target. It is fainter in K by 1.9 mag, and it is fainter in J by 2.17 mag. This should not perturb the acquisition.J2000J2000B-V = 0.03; F(1240) = 5.00E-14; F(1980) = 1.40E-13; F(2270) = 1.40E-13EXT-STARGIANT OJ2000J2000B-V = -0.17; F(1240) = 6.00E-13; F(1980) = 5.20E-13; F(2270) = 3.50E-13EXT-STARGIANT OJ2000J2000B-V = -0.18; F(1240) = 6.00E-13; F(1980) = 2.70E-13; F(2270) = 1.70E-13EXT-STARB0-B2 III-IAZV78J2000J2000B-V = -0.05; F(1240) = 5.00E-13; F(1980) = 8.00E-13; F(2270) = 8.00E-13EXT-STARGIANT OJ2000J2000B-V = -0.13; F(1240) = 3.50E-13; F(1700) = 3.00e-13EXT-STARGIANT OAnother point source (called 2MINGR3I in the GSC23 catalog) that has a K mag only 0.17 mag fainter is located at 3.37 arc sec away (toward the south-west), according to the GSC23 catalog query. It's fainter by 0.39 mag in J. U, B, V and R magnitudes are unknown. An inspection of existing WFC f606w and f814w images shows that this object is not as bright as the target. Hence, it approaches the target's brightness only at IR wavelengths longward of the response curve of the unfiltered CCD.J2000J2000B-V = -0.18; F(1240) = 4.00E-13; F(1980) = 1.70E-13; F(2270) = 1.20E-13EXT-STARMAIN SEQUENCE OJ2000J2000B-V = -0.20; F(1240) = 2.00E-13; F(1980) = 1.20E-13; F(2270) = 8.00E-14EXT-STARB0-B2 III-ITarget confirmation plate looks a little messy around the target, but extraneous objects are considerably fainter and approximately 6" away. Another object of comparable brightness to that of the target is listed in the GSC23 catalog, located about 0.35 arc-sec away (but with an error of 0.3 arc-sec). This is likely to be the target identified on an earlier sky survey plate, but with a small position offset.J2000J2000B-V = -0.12; F(1240) = 8.50E-13; F(1980) = 5.50E-13; F(2270) = 4.00E-13EXT-STARGIANT OJ2000J2000B-V = -0.19; F(1240) = 4.00E-13; F(1980) = 1.80E-13; F(2270) = 1.20E-13EXT-STARMAIN SEQUENCE OJ2000J2000B-V = -0.21 ;F(1240) = 3.50E-13; F(1980) = 1.70E-13; F(2270) = 1.10E-13EXT-STARSUPERGIANT OJ2000J2000B-V = 0.10; F(1240) = 9.00E-14; F(1980) = 8.50E-14; F(2270) = 6.00E-14EXT-STARMAIN SEQUENCE OJ2000J2000B-V = -0.09; F(1240) = 1.20E-13; F(1700) = 1.40e-13EXT-STARSUPERGIANT OJ2000J2000B-V = -0.18; F(1180) = 7e-13EXT-STARB0-B2 III-IBOT identifies the target but lists it as "unknown" presumably because neither photographic nor photometric magnitudes appear when the details are called up. However the GSC23 catalog lists BMag = 11.835 and VMag = 12.01, so the object should be safe.J2000J2000B-V = -0.04; F(1240) = 3.50E-13; F(1980) = 3.50E-13; F(2270) = 3.30E-13STIS/NUV-MAMASpectroscopicNoNoE230M1978STIS/NUV-MAMASpectroscopicNoNoE230M2269STIS/FUV-MAMASpectroscopicNoNoE140M1425STIS/NUV-MAMASpectroscopicNoNoE230M1978STIS/NUV-MAMASpectroscopicNoNoE230M2269STIS/NUV-MAMASpectroscopicNoNoE230M1978STIS/NUV-MAMASpectroscopicNoNoE230M2269STIS/FUV-MAMASpectroscopicNoNoE140M1425STIS/NUV-MAMASpectroscopicNoNoE230M1978STIS/NUV-MAMASpectroscopicNoNoE230M2269STIS/NUV-MAMASpectroscopicNoNoE230M1978STIS/NUV-MAMASpectroscopicNoNoE230M2269STIS/NUV-MAMASpectroscopicNoNoE230M1978STIS/NUV-MAMASpectroscopicNoNoE230M2269STIS/NUV-MAMASpectroscopicNoNoE230M1978STIS/NUV-MAMASpectroscopicNoNoE230M2269STIS/FUV-MAMASpectroscopicNoNoE140M1425STIS/NUV-MAMASpectroscopicNoNoE230M1978STIS/NUV-MAMASpectroscopicNoNoE230M2269STIS/FUV-MAMASpectroscopicNoNoE140M1425STIS/NUV-MAMASpectroscopicNoNoE230M1978STIS/NUV-MAMASpectroscopicNoNoE230M2269STIS/FUV-MAMASpectroscopicNoNoE140M1425STIS/NUV-MAMASpectroscopicNoNoE230M1978STIS/NUV-MAMASpectroscopicNoNoE230M2269STIS/NUV-MAMASpectroscopicNoNoE230M1978STIS/NUV-MAMASpectroscopicNoNoE230M2269STIS/NUV-MAMASpectroscopicNoNoE230M1978STIS/NUV-MAMASpectroscopicNoNoE230M2269STIS/FUV-MAMASpectroscopicNoNoE140M1425STIS/NUV-MAMASpectroscopicNoNoE230M1978STIS/NUV-MAMASpectroscopicNoNoE230M2269STIS/NUV-MAMASpectroscopicNoNoE230M1978STIS/NUV-MAMASpectroscopicNoNoE230M2269The scheduling data was generated by CASM 22.2.CASM was run in Phase II mode.1433130460000237.88225664059945(Tic-Visit
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:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13778
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:pcs-time 222
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:dark-offset NIL
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:low-sky "N"
:pcs-visibility 3614
:pcs-gap 0
)true30S/N in ETC rescaled by sqrt(actual time/ETC time) = 23.3S/N in ETC rescaled by sqrt(actual time/ETC time) = 27.0The scheduling data was generated by CASM 22.2.CASM was run in Phase II mode.(Tic-Visit
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:trans-version "20140605"
:date "23-Jul-2014 12:11:43.0"
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:saa-model "24"
:si-bright-earth-limb-angle 20.0
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)
(Tic-Obset
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)
(Tic-Orbit
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)
(Tic-Orbit
:proposal-id 13778
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)
(Tic-Orbit
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:pcs-time 222
:si-vis-utilization 3392
:al-overhead-at-end 194
:internal-dur-at-end 319
:dark-offset NIL
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:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3614
:pcs-gap 0
)true30S/N in ETC rescaled by sqrt(actual time/ETC time) = 23.5The scheduling data was generated by CASM 22.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13778
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:trans-version "20140605"
:date "23-Jul-2014 12:11:46.0"
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:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 296272
:tdrss-contact-duration 0
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)
(Tic-Obset
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)
(Tic-Orbit
:proposal-id 13778
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:al-overhead-at-end 194
:internal-dur-at-end 0
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)
(Tic-Orbit
:proposal-id 13778
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:al-overhead-at-end 194
:internal-dur-at-end 0
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)
(Tic-Orbit
:proposal-id 13778
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:pcs-time 222
:si-vis-utilization 3392
:al-overhead-at-end 194
:internal-dur-at-end 319
:dark-offset NIL
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:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3614
:pcs-gap 0
)true30S/N in ETC rescaled by sqrt(actual time/ETC time) = 22.2S/N in ETC rescaled by sqrt(actual time/ETC time) = 26.1The scheduling data was generated by CASM 22.2.CASM was run in Phase II mode.(Tic-Visit
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:trans-version "20140605"
:date "23-Jul-2014 12:11:50.0"
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:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 278864
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
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)
(Tic-Orbit
:proposal-id 13778
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:internal-dur-at-end 0
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)
(Tic-Orbit
:proposal-id 13778
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:si-vis-utilization 3392
:al-overhead-at-end 194
:internal-dur-at-end 0
:dark-offset NIL
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)
(Tic-Orbit
:proposal-id 13778
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:pcs-time 222
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:al-overhead-at-end 194
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
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:low-sky "N"
:pcs-visibility 3614
:pcs-gap 0
)true30S/N in ETC rescaled by sqrt(actual time/ETC time) = 22.0The scheduling data was generated by CASM 22.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13778
:visit-id "13"
:proposal-version -1
:trans-version "20140605"
:date "23-Jul-2014 12:12:00.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 5
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 470288
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13778
:visit-id "13"
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:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13778
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:al-overhead-at-end 194
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
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:low-sky "N"
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:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13778
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:orbit-number 2
:pcs-time 222
:si-vis-utilization 3392
:al-overhead-at-end 194
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
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:low-sky "N"
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:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13778
:visit-id "13"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 3392
:al-overhead-at-end 194
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3614
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13778
:visit-id "13"
:orbit-number 4
:pcs-time 222
:si-vis-utilization 3392
:al-overhead-at-end 194
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
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:pcs-visibility 3614
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13778
:visit-id "13"
:orbit-number 5
:pcs-time 222
:si-vis-utilization 3392
:al-overhead-at-end 194
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3614
:pcs-gap 0
)true50S/N in ETC rescaled by sqrt(actual time/ETC time) = 23.2S/N in ETC rescaled by sqrt(actual time/ETC time) = 21.1The scheduling data was generated by CASM 22.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13778
:visit-id "14"
:proposal-version -1
:trans-version "20140605"
:date "23-Jul-2014 12:07:00.0"
: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 278864
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
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:obset-id "14"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13778
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:pcs-time 333
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:al-overhead-at-end 194
:internal-dur-at-end 0
:dark-offset NIL
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:max-dark-utilization 1920
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:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13778
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:pcs-time 222
:si-vis-utilization 3392
:al-overhead-at-end 194
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3614
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13778
:visit-id "14"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 3392
:al-overhead-at-end 194
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3614
:pcs-gap 0
)true30S/N in ETC rescaled by sqrt(actual time/ETC time) = 24.1The scheduling data was generated by CASM 22.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13778
:visit-id "15"
:proposal-version -1
:trans-version "20140605"
:date "23-Jul-2014 12:07:29.0"
: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 365872
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13778
:visit-id "15"
:obset-id "15"
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)
(Tic-Orbit
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:pcs-time 333
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:al-overhead-at-end 194
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)
(Tic-Orbit
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:al-overhead-at-end 194
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
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:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13778
:visit-id "15"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 3392
:al-overhead-at-end 194
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
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)
(Tic-Orbit
:proposal-id 13778
:visit-id "15"
:orbit-number 4
:pcs-time 222
:si-vis-utilization 3392
:al-overhead-at-end 194
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3614
:pcs-gap 0
)true40S/N in ETC rescaled by sqrt(actual time/ETC time) = 22.2The scheduling data was generated by CASM 22.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13778
:visit-id "16"
:proposal-version -1
:trans-version "20140605"
:date "23-Jul-2014 12:12:10.0"
: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 365872
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13778
:visit-id "16"
:obset-id "16"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13778
:visit-id "16"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 3280
: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 3614
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13778
:visit-id "16"
:orbit-number 2
:pcs-time 222
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:al-overhead-at-end 194
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3614
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 13778
:visit-id "16"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 3392
:al-overhead-at-end 194
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3614
:pcs-gap 0
)true30S/N in ETC rescaled by sqrt(actual time/ETC time) = 18.8S/N in ETC rescaled by sqrt(actual time/ETC time) = 19.8S/N in ETC rescaled by sqrt(actual time/ETC time) = 26.3The scheduling data was generated by CASM 22.2.CASM was run in Phase II mode.1433247942000202.2490726100532(Tic-Visit
:proposal-id 13778
:visit-id "17"
:proposal-version -1
:trans-version "20140605"
:date "23-Jul-2014 12:12:11.0"
: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 104848
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13778
:visit-id "17"
:obset-id "17"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13778
:visit-id "17"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 3281
:al-overhead-at-end 194
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3614
:pcs-gap 0
)true10S/N in ETC rescaled by sqrt(actual time/ETC time) = 39.8This is a repeat of failed visit 02.(Tic-Visit
:proposal-id 13778
:visit-id "02"
:proposal-version -1
:trans-version "20140605"
:date "23-Jul-2014 12:10:33.0"
: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 104848
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13778
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13778
:visit-id "02"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 3281
:al-overhead-at-end 194
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3614
:pcs-gap 0
)false10S/N in ETC rescaled by sqrt(actual time/ETC time) = 41.2