15268( 8) - 14-Oct-2019 17:54:03 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15268 Version: 8 Check-in Time: 14-Oct-2019 17:54:03 STScI Edit Number: 0 Title A First Investigation of the UV Extinction Properties of Interstellar Dust in M33 ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Geoffrey C. Clayton Louisiana State University and A & M Y College CoI: Dr. Karl D. Gordon Space Telescope Science Institute N CoI: Dr. Derck L. Massa Space Science Institute N CoI: Dr. Edward Luke Fitzpatrick Villanova University N CoI: Dr. Michael J. Wolff Space Science Institute N CoI: Dr. Luciana C. Bianchi The Johns Hopkins University N CoI: Dr. Philip Louis Massey Lowell Observatory N CoI: Kathryn Forbes Neugent Lowell Observatory N ------------------------------------------------------------------------------------ Abstract It is well known that the standard Milky Way UV extinction curve does not hold even in the most nearby galaxies, the LMC and the SMC. But, it is not even known whether the standard curve holds throughout our own galaxy because our position in the disk of the Milky Way, where extinction is high, prevents us from seeing most of our galaxy at UV wavelengths. We have a unique opportunity, while we still have the capability to obtain UV spectra, to investigate the UV extinction properties across another spiral galaxy in the Local Group, M33. The small aperture and high sensitivity of HST/STIS are ideal for obtaining UV spectra of stars in the crowded fields of M33. We propose to observe 8 stars in M33 which will provide good spatial coverage. We are choosing sightlines that lie in the footprint of the M33 Legacy Survey which extends the Panchromatic Hubble Andromeda Treasury (PHAT) survey. Focusing our study on the detailed properties of M33 dust grains via UV spectroscopy with HST/STIS will mean that we can directly connect the variations seen in the UV extinction curves with their environments. By selecting our sightlines in the M33 PHAT survey region, we will be able to probe a variety of potential correlations between dust grains and their environment. This proposal is part of a long-term program to investigate the extinction properties of interstellar dust across a sample of Local Group galaxies, also including M31, with different global characteristics such as metallicity and star formation activity. There is a metallicity gradient across M33 from solar to sub-solar that will be sampled with our proposed sightlines. ------------------------------------------------------------------------------------ Observations Description ------------------------ We plan to observe a total of 8 stars, listed in Table 1 and in the Target Summary. The stars require 2 orbits each for a total of 16 orbits. The visibilityfor M33 (Dec ~+40 deg) is approximately 54 minutes per orbit. Using the Phase II Orbit Planner, including the Guide Star and STIS acquisition overheads, we find that we will get about 2800 s per orbit on M33 targets with the G230L and G140L gratings. Since we are using the 0.2 x 0.2 slit, no peakup 15268( 8) - 14-Oct-2019 17:54:03 - [ 2] is required. Each target has a single 2-orbit visit with no repeat visits, one orbit for each grating. ------------------------------------------------------------------------------------ 15268( 8) - 14-Oct-2019 17:54:03 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 10 OFFSET-STAR- STAR, G III-I RA=01H34M13.1688S, J2000 V = 16.6 +/- 0.1 B-V = 0.60 1 DEC=+30D34'32.71" Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 1 J013416.10+3 STAR, B0-B2 III-I RA-OFF=2.904S, DEC-OFF=-47.96", J2000 V = 16.6 +/- 0.1 B-V=0.08 03344.9 FROM 10 Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 11 OFFSET-STAR- STAR, A4-A9 III-I RA=01H32M50.5326S, J2000 V = 18.2 +/- 0.1 B-V=0.17 2 DEC=+30D35'26.79" Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 2 J013250.80+3 STAR, B0-B2 III-I RA-OFF=0.220S, DEC-OFF=-19.24", J2000 V = 19.72 +/- 0.1 B-V=0.63 03507 FROM 11 Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 3 J013341.93+3 STAR, B0-B2 III-I RA=01H33M41.8838S, J2000 V = 18.4 +/- 0.1 B-V=0.2 04728 DEC=+30D47'28.32" Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 4 J013344.59+3 STAR, OF RA=01H33M44.6361S, J2000 V = 18.6 +/- 0.1 B-V = 0.35 04436 DEC=+30D44'36.68" Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 5 J013406.63+3 STAR, B0-B2 III-I RA=01H34M6.5996S, J2000 V = 16.0 +/- 0.1 B-V=0.25 04147 DEC=+30D41'47.60" Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 6 J013339.52+3 STAR, B0-B2 III-I RA=01H33M39.4900S, J2000 V = 17.50 +/- 0.01 04540 DEC=+30D45'40.40" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 13 OFFSET-STAR- STAR, K III-I RA=01H34M11.2770S, J2000 V = 21.3 +/- 0.1 I = 18.7 7 DEC=+30D46'17.94" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 7 J013410.59+3 STAR, B0-B2 III-I RA-OFF=-0.672S, DEC-OFF=-1.44", J2000 V = 18.7 +/- 0.1 B-V =0.29 04616 FROM 13 Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 8 J013334.26+3 STAR, B0-B2 III-I RA=01H33M34.2300S, J2000 V = 18.55 +/- 0.01 03327 DEC=+30D33'27.50" Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 15268( 8) - 14-Oct-2019 17:54:03 - [ 4] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OFFSET-STAR STIS/CCD ACQ F28X50LP MIRROR 1 10 S (10 -1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J013416.10+ STIS/CCD ACQ/PEA 0.2X0.09 MIRROR 1 10 S (10 303344.9 K S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J013416.10+ STIS/NUV ACCUM 0.2X0.2 G230L 2376 1 2375 S 303344.9 -MAMA see below (1624 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 J013416.10+ STIS/NUV ACCUM 0.2X0.2 G230L 2376 1 3025 S 303344.9 -MAMA see below (2850 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ OFFSET-STAR-1 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A J013416.10+303344.9 2 STIS/CCD ACQ/PEA 0.2X0.09 MIRROR none none none none 1 N/A K J013416.10+303344.9 3 STIS/NUV ACCUM 0.2X0.2 G230L 2376 none none none none 1 1624.0 S -MAMA J013416.10+303344.9 4 STIS/NUV ACCUM 0.2X0.2 G230L 2376 none none none none 2 2850.0 S -MAMA 15268( 8) - 14-Oct-2019 17:54:03 - [ 5] Visit: 02 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OFFSET-STAR STIS/CCD ACQ F28X50LP MIRROR 1 10 S (10 -2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J013250.80+ STIS/CCD ACQ/PEA 0.2X0.09 MIRROR 1 23 S (23 303507 K S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J013250.80+ STIS/NUV ACCUM 0.2X0.2 G230L 2376 1 2375 S 303507 -MAMA see below (1379 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 J013250.80+ STIS/FUV ACCUM 0.2X0.2 G140L 1425 1 3025 S 303507 -MAMA see below (2836 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ OFFSET-STAR-2 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A J013250.80+303507 2 STIS/CCD ACQ/PEA 0.2X0.09 MIRROR none none none none 1 N/A K J013250.80+303507 3 STIS/NUV ACCUM 0.2X0.2 G230L 2376 none none none none 1 1379.0 S -MAMA J013250.80+303507 4 STIS/FUV ACCUM 0.2X0.2 G140L 1425 none none none none 2 2836.0 S -MAMA 15268( 8) - 14-Oct-2019 17:54:03 - [ 6] Visit: 03 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 J013341.93+ STIS/CCD ACQ F28X50LP MIRROR 1 10 S (10 304728 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J013341.93+ STIS/NUV ACCUM 0.2X0.2 G230L 2376 1 2375 S 304728 -MAMA see below (2187 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J013341.93+ STIS/FUV ACCUM 0.2X0.2 G140L 1425 1 3025 S 304728 -MAMA see below (2836 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ J013341.93+304728 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A J013341.93+304728 2 STIS/NUV ACCUM 0.2X0.2 G230L 2376 none none none none 1 2187.0 S -MAMA J013341.93+304728 3 STIS/FUV ACCUM 0.2X0.2 G140L 1425 none none none none 2 2836.0 S -MAMA 15268( 8) - 14-Oct-2019 17:54:03 - [ 7] Visit: 04 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 J013344.59+ STIS/CCD ACQ F28X50LP MIRROR 1 10 S (10 304436 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J013344.59+ STIS/NUV ACCUM 0.2X0.2 G230L 2376 1 2375 S 304436 -MAMA see below (2247 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J013344.59+ STIS/FUV ACCUM 0.2X0.2 G140L 1425 1 3025 S 304436 -MAMA see below (2836 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ J013344.59+304436 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A J013344.59+304436 2 STIS/NUV ACCUM 0.2X0.2 G230L 2376 none none none none 1 2247.0 S -MAMA J013344.59+304436 3 STIS/FUV ACCUM 0.2X0.2 G140L 1425 none none none none 2 2836.0 S -MAMA 15268( 8) - 14-Oct-2019 17:54:03 - [ 8] Visit: 05 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 J013406.63+ STIS/CCD ACQ F28X50LP MIRROR 1 10 S (10 304147 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J013406.63+ STIS/NUV ACCUM 0.2X0.2 G230L 2376 1 2375 S 304147 -MAMA see below (2247 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J013406.63+ STIS/FUV ACCUM 0.2X0.2 G140L 1425 1 3025 S 304147 -MAMA see below (2836 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ J013406.63+304147 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A J013406.63+304147 2 STIS/NUV ACCUM 0.2X0.2 G230L 2376 none none none none 1 2247.0 S -MAMA J013406.63+304147 3 STIS/FUV ACCUM 0.2X0.2 G140L 1425 none none none none 2 2836.0 S -MAMA 15268( 8) - 14-Oct-2019 17:54:03 - [ 9] Visit: 06 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 J013339.52+ STIS/CCD ACQ 50CCD MIRROR 1 10 S (10 304540 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J013339.52+ STIS/NUV ACCUM 0.2X0.2 G230L 2376 1 2230 S 304540 -MAMA (2230 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J013339.52+ STIS/FUV ACCUM 0.2X0.2 G140L 1425 1 2836 S 304540 -MAMA (2836 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ J013339.52+304540 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A J013339.52+304540 2 STIS/NUV ACCUM 0.2X0.2 G230L 2376 none none none none 1 N/A -MAMA J013339.52+304540 3 STIS/FUV ACCUM 0.2X0.2 G140L 1425 none none none none 2 N/A -MAMA 15268( 8) - 14-Oct-2019 17:54:03 - [ 10] Visit: 07 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OFFSET-STAR STIS/CCD ACQ F28X50LP MIRROR 1 20 S (20 -7 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J013410.59+ STIS/CCD ACQ/PEA 0.2X0.09 MIRROR 1 10 S (10 304616 K S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J013410.59+ STIS/NUV ACCUM 0.2X0.2 G230L 2376 1 2375 S 304616 -MAMA see below (1605 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 J013410.59+ STIS/FUV ACCUM 0.2X0.2 G140L 1425 1 3025 S 304616 -MAMA see below (2836 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ OFFSET-STAR-7 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A J013410.59+304616 2 STIS/CCD ACQ/PEA 0.2X0.09 MIRROR none none none none 1 N/A K J013410.59+304616 3 STIS/NUV ACCUM 0.2X0.2 G230L 2376 none none none none 1 1605.0 S -MAMA J013410.59+304616 4 STIS/FUV ACCUM 0.2X0.2 G140L 1425 none none none none 2 2836.0 S -MAMA 15268( 8) - 14-Oct-2019 17:54:03 - [ 11] Visit: 08 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 J013334.26+ STIS/CCD ACQ 50CCD MIRROR 1 10 S (10 303327 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J013334.26+ STIS/NUV ACCUM 0.2X0.2 G230L 2376 1 2230 S 303327 -MAMA (2230 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J013334.26+ STIS/FUV ACCUM 0.2X0.2 G140L 1425 1 2836 S 303327 -MAMA (2836 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ J013334.26+303327 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A J013334.26+303327 2 STIS/NUV ACCUM 0.2X0.2 G230L 2376 none none none none 1 N/A -MAMA J013334.26+303327 3 STIS/FUV ACCUM 0.2X0.2 G140L 1425 none none none none 2 N/A -MAMA 15268( 8) - 14-Oct-2019 17:54:03 - [ 12] Summary Form for Proposal 15268 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.2X0.09, 0.2X0.2, 50CCD, F28X50LP ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/PEAK ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, G230L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names J013250.80+303507, J013334.26+303327, J013339.52+304540, J013341.93+304728, J013344.59+304436, J013406.63+304147, J013410.59+304616, J013416.10+303344.9, OFFSET-STAR-1, OFFSET-STAR-2, OFFSET-STAR-7 ------------------------------------------------------------------------------------------------------------------------------------