0 Assigned ID: 3068 ----- Attempting Submission 1 (Thu Mar 24 21:50:47 GMT 2022) ----- HST Phase I Proposal 3068 successfully submitted. Receipt: # 3068-1 ----- Attempting Submission 2 (Fri Mar 25 19:51:32 GMT 2022) ----- Fixed orbit overrun. -2085643463 ----- Attempting Submission 1 (Fri Jul 01 15:16:05 GMT 2022) ----- ----- Attempting Submission 2 (Mon Sep 12 14:35:33 GMT 2022) ----- HST Phase II Proposal 17088 successfully submitted. Receipt: # 17088-2 ----- Attempting Submission 3 (Mon Sep 12 15:10:37 GMT 2022) ----- HST Phase II Proposal 17088 successfully submitted. Receipt: # 17088-3 ----- Attempting Submission 4 (Fri Sep 23 14:28:14 GMT 2022) ----- ----- Attempting Submission 5 (Tue Jan 30 03:44:29 GMT 2024) ----- ----- Attempting Submission 6 (Mon Jul 01 01:01:26 GMT 2024) ----- ----- Attempting Submission 7 (Mon Jul 01 15:34:19 GMT 2024) ----- High-redshift AGB analogs in the galaxy DDO 68 The origin of the dust seen in high-redshift quasars remains controversial. Observations have shown that Asymptotic Giant Branch (AGB) stars can produce significant dust in the Magellanic Clouds and the Milky Way, but it is unclear whether dust production is as prolific in the metal-poor systems that are representative of high-redshift galaxies. In metal-poor environments, models suggest that dust production should be limited by a star's initial metallicity, since metals are necessary to seed the nucleation of dust grains. Observations of AGB stars in nearby metal-poor galaxies, however, suggest that dust production may not be inhibited at low metallicity environments. DDO 68 is the best nearby analog of high-redshift galaxies, whose stellar population can be resolved using HST. Given its metal-poor environment and high star formation rate, DDO 68 provides a unique opportunity to search for dust-producing AGB stars. Successful detection of dusty AGB stars will have major implications on dust evolution models by increasing the allowable dust formation at early epochs. We will observe DDO 68 in three medium-band WFC3/IR filters of HST to (1) unambiguously identify the AGB stars, (2) determine their chemical types, and (3) establish whether they are producing significant dust. With future follow-up spectroscopic observations using JWST, our proposed HST imaging campaign will enable detailed studies of the dust properties, composition, and masses. Thus, our proposed program is crucial to solving the decades long mystery, the "Dust Budget Crisis". We will be imaing the same position, the dwarf galaxy DDO 68, in three WFC3/IR medium-band filters (F127M, F139M, and F153M). We will utilize a four-point BOX-MIN dither strategy. Each Visit is two orbits and identical to the rest. Each is composed of 8 sub-exposure dithers for each of the three filter. Failed Gyro: In preparation for the possibility of a failed gyro we have limited visits to two orbits to increase the potential for schedulability. A key to our scientific analysis is relative magnitude difference between the three filters. These evolved stars are also likely to vary on timescales between a couple hundred, to a couple thousand days. We include each of the three filters in each visit to ensure we mantain the ability to measure comtemporaneous relative magnitude differences between filters for each visit even if the program is extended beyond the nominal timeframe of Cycle 30. PI Goldman has done this same analysis in Leo P (Goldman et al. 2019b) and is an expert in AGB stars and stellar evolution. CoI Boyer is an experts in evolved stars, dwarf galaxies, and HST photometry. CoI McQuinn is an expert in resolved stellar populations and nearby dwarf galaxies. CoI Hirschauer is an expert on extremely metal-poor galaxies and their gas-phase abundance measurements. CoI Choudhury is an expert in nearby dwarf galaxies, resolved stellar populations, and multi-wavelength photometric data (UV, optical and NIR) from space and ground based telescope facilities. Stellar Populations and the Interstellar Medium 6 false false false false false false false false SUPPORTED GALAXY DWARF COMPACT J2000 J2000 GALAXY DWARF COMPACT J2000 GALAXY DWARF COMPACT J2000 GALAXY DWARF COMPACT J2000 GALAXY DWARF COMPACT J2000 GALAXY DWARF COMPACT J2000 GALAXY DWARF COMPACT J2000 GALAXY DWARF COMPACT J2000 GALAXY DWARF COMPACT J2000 GALAXY DWARF COMPACT J2000 GALAXY DWARF COMPACT J2000 GALAXY DWARF COMPACT J2000 GALAXY DWARF COMPACT J2000 GALAXY DWARF COMPACT J2000 GALAXY DWARF COMPACT J2000 WFC3/IR Imaging No No F127M WFC3/IR Imaging No No F139M WFC3/IR Imaging No No F153M POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 1 false The scheduling data was generated by CASM 32.1.1. 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Observations need to be taken as close as possible together, as these stars can be highly variable. Observations need to be taken as close as possible together, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. 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Observations need to be taken as close as possible together, as these stars can be highly variable. Observations need to be taken as close as possible together, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. 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Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. 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Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. 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Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. 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Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. 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Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. 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Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1702378974000 282.5711278262106 (Tic-Visit :proposal-id 17088 :visit-id "09" :proposal-version -1 :trans-version "20230626" :date "29-Jan-2024 20:15:34.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3760480 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17088 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17088 :visit-id "09" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2726 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3144 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17088 :visit-id "09" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2726 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3144 :pcs-gap 0 ) true 2 0 Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1702390369000 282.5276175484593 (Tic-Visit :proposal-id 17088 :visit-id "10" :proposal-version -1 :trans-version "20240604" :date "30-Jun-2024 20:56:38.0" :trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3760480 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17088 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17088 :visit-id "10" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2726 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17088 :visit-id "10" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2746 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) true 2 2 Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1702401764000 282.4823794083166 (Tic-Visit :proposal-id 17088 :visit-id "11" :proposal-version -1 :trans-version "20240604" :date "30-Jun-2024 20:56:40.0" :trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3760480 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17088 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17088 :visit-id "11" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2726 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17088 :visit-id "11" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2746 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) true 2 2 Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1702413158000 282.4370361815099 (Tic-Visit :proposal-id 17088 :visit-id "12" :proposal-version -1 :trans-version "20240604" :date "30-Jun-2024 20:56:41.0" :trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3760480 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17088 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17088 :visit-id "12" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2726 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17088 :visit-id "12" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2746 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) true 2 2 Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1702475828000 282.1863151006914 (Tic-Visit :proposal-id 17088 :visit-id "13" :proposal-version -1 :trans-version "20240604" :date "30-Jun-2024 20:56:44.0" :trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3760480 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17088 :visit-id "13" :obset-id "13" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17088 :visit-id "13" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2726 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17088 :visit-id "13" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2746 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) true 2 2 Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1702487223000 282.13999380949497 (Tic-Visit :proposal-id 17088 :visit-id "14" :proposal-version -1 :trans-version "20240604" :date "30-Jun-2024 20:56:45.0" :trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3760480 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17088 :visit-id "14" :obset-id "14" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17088 :visit-id "14" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2726 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17088 :visit-id "14" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2746 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) true 2 2 Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1702498617000 282.09356325044723 (Tic-Visit :proposal-id 17088 :visit-id "15" :proposal-version -1 :trans-version "20240604" :date "30-Jun-2024 20:56:47.0" :trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3760480 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17088 :visit-id "15" :obset-id "15" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17088 :visit-id "15" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2726 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17088 :visit-id "15" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2746 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) true 2 2 Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. Observations need to be taken within a couple weeks of each other, as these stars can be highly variable. The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1700241567000 287.8712824083874 (Tic-Visit :proposal-id 17088 :visit-id "01" :proposal-version -1 :trans-version "20240604" :date "30-Jun-2024 20:56:48.0" :trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3760480 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17088 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17088 :visit-id "01" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2726 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17088 :visit-id "01" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2746 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) true 2 2 Observations need to be taken as close as possible together, as these stars can be highly variable. Observations need to be taken as close as possible together, as these stars can be highly variable. Observations need to be taken as close as possible together, as these stars can be highly variable.