Assigned ID: 364 ----- Attempting Submission 1 (Fri Feb 25 14:28:52 GMT 2011) ----- Hopefully all is well with this ! If not, there is time to adjust with advice from STScI. ----- Attempting Submission 1 (Sat Jul 02 09:22:48 GMT 2011) ----- The Origins of Carbon-Enhanced Metal-Poor Stars We propose to measure abundances of light and heavy neutron-capture elements for six of the brightest examples of carbon-enhanced metal-poor (CEMP) stars, in order to provide the data needed to directly test models for the origin of these stars in the early Galaxy. CEMP stars are recognized as important tracers of Galactic chemical evolution at metallicities [Fe/H] < -2.0, where they account for on the order of 20% of all stars, rising to 40% below [Fe/H] = -3.5, and 100% below [Fe/H] = -4.0. Detailed understanding of their astrophysical origin has been limited by the lack of a complete inventory of their neutron-capture elements, which are required to probe the nucleosynthetic processes involved in producing their distinctive abundance patterns. Our targets span the known range of neutron-capture element variations associated with CEMP stars (3 stars with pure s-process enhancements, 2 stars with evidence of both r-process and s-process enhancements, and 1 star with low abundances of neutron-capture elements). Each class may well be associated with different progenitor objects, including the first AGB stars in the Galaxy, "faint supernovae'' undergoing mixing and fallback, or even the winds from massive, rapidly rotating stars with [Fe/H] < -6.0. A more complete set of neutron-capture elements will provide tight constraints on these nucleosynthetic and evolutionary models, including the necessary ingredients for understanding the structure and evolution of the first AGB stars in the Galaxy, and shed light on the transition phase from SNII as major C-producers in the early Universe to AGB stars being the major C-producers at later times.
We will use STIS (NUV-MAMA detectors, E230M grating) to observe three carbon enhanced metal-poor (CEMP) stars. These stars are the brightest representatives of the CEMP-s, CEMP-r/s, and CEMP-no classes. All three target stars have been chosen on the basis of abundances derived from high-quality ground-based optical spectra and the stars' relative brightness. The transitions of interest are spaced over a wide wavelength range of the near-UV (2282 to 3058 Angstroms). Our target S/N (~40/1 per resolution element in the continuum near 2833 Angstroms) is based on our line strength predictions for typical features of interest (specifically, Pb I 2833). We have estimated integration times using the current version of the STIS exposure time calculator for our setup based on Kurucz models of the flux distribution for our 3 target stars. We plan an ACQ and ACQ/PEAK image at the beginning of all visits, and another ACQ/PEAK image in the middle of visits lasting longer than 3 orbits. Otherwise, the obseving strategy is straightforward: spend as much time as possible observing these stars in one echelle mode to acquire as much S/N as possible. Finding charts checked to confirm that predicted star positions at epoch of DSS image perfectly align with the diffraction spikes. -iur, 30jun2011 (To do this: click on the "Targets", "Fixed Targets", [starname], then "File" --> "Export" --> "Export Target Confirmation Charts") COOL STARS 12 false 0.0 0.0 false false false false SUPPORTED STAR G III-I Coordinates, PM, parallax, and RV taken from SIMBAD using the values from the 2007 Hipparcos re-reduction. -iur, 30jun2011 J2000 J2000 STAR K III-I Coordinates, PM, parallax, and RV taken from SIMBAD using the values from the 2007 Hipparcos re-reduction. -iur, 30jun2011 J2000 J2000 STAR K III-I Coordinates, PM, parallax, and RV taken from SIMBAD using the values from the 2007 Hipparcos re-reduction. -iur, 30jun2011 J2000 J2000 STIS/NUV-MAMA Spectroscopic No No E230M 2707 STIS/NUV-MAMA Spectroscopic No No E230M 2707 STIS/NUV-MAMA Spectroscopic No No E230M 2707 STIS/NUV-MAMA Spectroscopic No No E230M 2707 STIS/NUV-MAMA Spectroscopic No No E230M 2707 STIS/NUV-MAMA Spectroscopic No No E230M 2707 STIS/NUV-MAMA Spectroscopic No No E230M 2707 The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. C:\Users\Timothy\AppData\Local\Temp\OPVisit2279747246511817666.xml BD+440493 - visit 1 of 2 (Tic-Visit :proposal-id 12554 :visit-id "03" :proposal-version -1 :trans-version "20110509" :date "02-Jul-2011 05:22:06.0" :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 348608 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12554 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12554 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3008 :al-overhead-at-end 0 :internal-dur-at-end 115 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3341 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12554 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3119 :al-overhead-at-end 81 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3341 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12554 :visit-id "03" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3119 :al-overhead-at-end 0 :internal-dur-at-end 115 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3341 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12554 :visit-id "03" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3119 :al-overhead-at-end 81 :internal-dur-at-end 396 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3341 :pcs-gap 0 ) true 4 0 The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. 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