Constraining Pop III supernova energies and the formation of the first low-mass stars with the iron-poor star HE1327-2326 (with [Fe/H] = -5.4)

0 Assigned ID: 1095 ----- Attempting Submission 1 (Fri Apr 10 23:53:06 GMT 2015) ----- HST Phase I Proposal 1095 (he1327_phase1_GO_cycle23_apt) successfully submitted. Receipt: # 1095-1 ----- Attempting Submission 2 (Fri Apr 10 23:58:26 GMT 2015) ----- HST Phase I Proposal 1095 (he1327_phase1_GO_cycle23_apt) successfully submitted. Receipt: # 1095-2 0 ----- Attempting Submission 1 (Mon Jul 06 14:38:26 GMT 2015) ----- Constraining Pop III supernova energies and the formation of the first low-mass stars with the iron-poor star HE1327-2326 (with [Fe/H] = -5.4) The nucleosynthetic signatures of the first stars and supernovae are imprinted in the atmosphere of the long-lived, iron-poor star HE1327-2326 (with [Fe/H] = -5.4). Comparing the abundance signatures of stars like HE1327-2326 with predictions of early low-mass star formation pathways as well as low-metallicity supernova yields provides the only empirical constraints on these early processes, including the properties of the first stars (e.g. mass, explosion energy). We propose COS high-resolution near-UV spectral observations of HE1327-2326, which is the only known member of the most iron-poor class of stars bright enough for HST observations. It thus provides us with a unique opportunity for a new abundance analysis to address the important and still unanswered questions about the deaths of Pop III stars and the formation of the first low-mass stars. Using the three COS stripes covering spectral portions between 2120A and 2350A, our specific goals are: (1) attempt a Si I detection to rule out that HE1327-2326 formed from dust-cooled gas; (2) attempt a Zn I detection at the level of [Zn/Fe] ~ 0.5. Such a detection would indicate a more energetic Pop III hypernova as progenitor. A non-detection (i.e., decreased upper limit) would provide additional evidence of the previously suggested faint, low-energy progenitor; (3) Fe II, Ni I and Ni II lines will be detected and enable detailed iron-peak element nucleosynthesis assesment in the first stars ii) calibration of our UV abundance scale, and iii) assessment of NLTE effects at this low metallicity and a surface gravity measurement. This will yield the kind of robust iron-peak pattern necessary for constraining the PopIII progenitor. The goal is to get as much S/N as possible (after many co-additions!) on some NUV spectral stripes of HE1327-2326. We use COS grating G225M, central wavelength 2233 Angstroms. I have verified the target confirmation chart for this star. -- IUR, 06 July 2015 COOL STARS 12 false false false false 0.0 0.0 SUPPORTED STAR G V-IV HALO POPULATION II NO This object was generated by the targetselector and retrieved from the SIMBAD database. Coords and PM from UCAC4 (via Vizier). J2000 J2000 U= 13.787 COS/NUV Spectroscopic No No G225M 2233 1436193412451 /private/var/folders/ly/dz_8k_s14_qbfx0j25d8qbjc0000gn/T/OPVisit832829418427672802.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 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Also, coordinates are very good, so follow sequence #1 in Table 8.1. Exposure time is ETC value, rounded up. Buffer time is 2/3 times ETC value (calculated for total integration time). 1436193417524 /private/var/folders/ly/dz_8k_s14_qbfx0j25d8qbjc0000gn/T/OPVisit6172435167222895905.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 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Also, coordinates are very good, so follow sequence #1 in Table 8.1. Exposure time is ETC value, rounded up. Buffer time is 2/3 times ETC value (calculated for total integration time). 1436193420422 /private/var/folders/ly/dz_8k_s14_qbfx0j25d8qbjc0000gn/T/OPVisit6627884016408114460.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 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Also, coordinates are very good, so follow sequence #1 in Table 8.1. Exposure time is ETC value, rounded up. Buffer time is 2/3 times ETC value (calculated for total integration time). 1436193425016 /private/var/folders/ly/dz_8k_s14_qbfx0j25d8qbjc0000gn/T/OPVisit3070417888327549112.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 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Also, coordinates are very good, so follow sequence #1 in Table 8.1. Exposure time is ETC value, rounded up. Buffer time is 2/3 times ETC value (calculated for total integration time). 1436193429429 /private/var/folders/ly/dz_8k_s14_qbfx0j25d8qbjc0000gn/T/OPVisit4587920735013468390.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 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Also, coordinates are very good, so follow sequence #1 in Table 8.1. Exposure time is ETC value, rounded up. Buffer time is 2/3 times ETC value (calculated for total integration time). 1436193433965 /private/var/folders/ly/dz_8k_s14_qbfx0j25d8qbjc0000gn/T/OPVisit8397164376581578393.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 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Also, coordinates are very good, so follow sequence #1 in Table 8.1. Exposure time is ETC value, rounded up. Buffer time is 2/3 times ETC value (calculated for total integration time). 1436193438486 /private/var/folders/ly/dz_8k_s14_qbfx0j25d8qbjc0000gn/T/OPVisit3678994645956133531.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 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Also, coordinates are very good, so follow sequence #1 in Table 8.1. Exposure time is ETC value, rounded up. Buffer time is 2/3 times ETC value (calculated for total integration time). 1436193441370 /private/var/folders/ly/dz_8k_s14_qbfx0j25d8qbjc0000gn/T/OPVisit6138464404327153323.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 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Also, coordinates are very good, so follow sequence #1 in Table 8.1. Exposure time is ETC value, rounded up. Buffer time is 2/3 times ETC value (calculated for total integration time). 1436193445889 /private/var/folders/ly/dz_8k_s14_qbfx0j25d8qbjc0000gn/T/OPVisit570938197549414184.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 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Also, coordinates are very good, so follow sequence #1 in Table 8.1. Exposure time is ETC value, rounded up. Buffer time is 2/3 times ETC value (calculated for total integration time). 1436193450194 /private/var/folders/ly/dz_8k_s14_qbfx0j25d8qbjc0000gn/T/OPVisit3857160436257323507.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14151 :visit-id "10" :proposal-version -1 :trans-version "20150609" :date "06-Jul-2015 10:37:29.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "32" :si-bright-earth-limb-angle 20.0 :data-volume 278432 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14151 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14151 :visit-id "10" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2888 :al-overhead-at-end 0 :internal-dur-at-end 95 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14151 :visit-id "10" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3000 :al-overhead-at-end 0 :internal-dur-at-end 398 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) true 2 0 Target is not too bright for MIRRORB acquisition exposures. Also, coordinates are very good, so follow sequence #1 in Table 8.1. Exposure time is ETC value, rounded up. Buffer time is 2/3 times ETC value (calculated for total integration time).