8342( 5) - 10/05/99 06:32 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 8342 Version: 5 Check-in Date: 05-Oct-1999 06:30:03 1.Proposal Title: ABUNDANCES IN HALO STARS AND GALACTIC ELEMENT FORMATION ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 8 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: John Cowan University of Oklahoma Norman Campus CoI: Prof. Timothy Beers Michigan State University N CoI: Dr. Francesca Primas European Southern Observatory N CoI: Prof. Christopher Sneden University of Texas N CoI: Prof. James Truran University of Chicago N ------------------------------------------------------------------------------------ 5. Abstract We propose to measure the abundances of a wide array of elements ranging from light neutron-capture elements (such as germanium) up to the very heaviest such elements (including platinum and lead) in a number of very old, metal-poor halo stars. These elements, synthesized in stellar interiors by r(apid) and s(low) neutron capture processes, had, until our very recent successful detections in Cycles 5 and 6, never before been observed in metal-poor stars because their only strong lines lie in the ultraviolet spectral region. The abundance data of both the lighter and heavier neutron-capture elements in the same stars will be critical to an understanding of the early star formation, nucleosynthetic history and associated chemical evolution of our Galaxy. Employing the HST data of the most massive stable elements to define the initial abundances of the radioactive elements (particularly thorium), we will also determine the chronometric (radioactive-decay) ages of our target stars, and thus define an actual age-metallicity relationship for the halo stars in the Galaxy. Our results for the very oldest Galactic stars will also provide an important, and independent, age determination for the Galaxy and hence constrain cosmological age estimates. ------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 2] Observations Description ------------------------ The stars we have chosen to include in our survey are those which previous optical data have shown to have relatively high r-process elements. We desire to cover a range of abundances in our survey. The distribution on abundances of the stars listed below is: \qquad 3 stars with -1.0 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD115444 STIS/C ACQ F28X50O MIRROR 1 1.0 S ONBOARD ACQ FOR 2 CD II ------------------------------------------------------------------------------------------------------------------------------------ 2 HD115444 STIS/C ACQ/PEA 0.2X0.0 G430M 4194 1 3 S ONBOARD ACQ FOR 3-4 CD K 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD115444 STIS/N ACCUM 0.2X0.0 E230M 2707 1 1970 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD115444 STIS/N ACCUM 0.2X0.0 E230M 2707 4 2977 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 7] Visit: 02 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD115444 STIS/C ACQ F28X50O MIRROR 1 1 S ONBOARD ACQ FOR 2 CD II ------------------------------------------------------------------------------------------------------------------------------------ 2 HD115444 STIS/C ACQ/PEA 0.2X0.0 G430M 4194 1 3 S ONBOARD ACQ FOR 3 CD K 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD115444 STIS/N ACCUM 0.2X0.0 E230M 2707 1 1970 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 8] Visit: 03 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD6268 STIS/C ACQ F28X50O MIRROR 1 0.3 S ONBOARD ACQ FOR 2 CD II ------------------------------------------------------------------------------------------------------------------------------------ 2 HD6268 STIS/C ACQ/PEA 0.2X0.0 G430M 4194 1 1 S ONBOARD ACQ FOR 3-4 CD K 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD6268 STIS/N ACCUM 0.2X0.0 E230M 2707 1 1870 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD6268 STIS/N ACCUM 0.2X0.0 E230M 2707 1 2977 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 9] Visit: 04 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD6755 STIS/C ACQ F28X50O MIRROR 1 0.3 S ONBOARD ACQ FOR 2 CD II ------------------------------------------------------------------------------------------------------------------------------------ 2 HD6755 STIS/C ACQ/PEA 0.2X0.0 G430M 4194 1 1 S ONBOARD ACQ FOR 3 CD K 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD6755 STIS/N ACCUM 0.2X0.0 E230M 2707 1 2040 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 10] Visit: 05 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD122956 STIS/C ACQ F28X50O MIRROR 1 0.2 S ONBOARD ACQ FOR 2 CD II ------------------------------------------------------------------------------------------------------------------------------------ 2 HD122956 STIS/C ACQ/PEA 0.2X0.0 G430M 4194 1 0.5 S ONBOARD ACQ FOR 3-4 CD K 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD122956 STIS/N ACCUM 0.2X0.0 E230M 2707 1 1970 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD122956 STIS/N ACCUM 0.2X0.0 E230M 2707 1 2977 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 11] Visit: 06 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD126587 STIS/C ACQ F28X50O MIRROR 1 1 S ONBOARD ACQ FOR 2 CD II ------------------------------------------------------------------------------------------------------------------------------------ 2 HD126587 STIS/C ACQ/PEA 0.2X0.0 G430M 4194 1 3 S ONBOARD ACQ FOR 3-4 CD K 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD126587 STIS/N ACCUM 0.2X0.0 E230M 2707 1 1970 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD126587 STIS/N ACCUM 0.2X0.0 E230M 2707 4 2977 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 12] Visit: 07 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 BD+173248 STIS/C ACQ F28X50O MIRROR 1 1 S ONBOARD ACQ FOR 2 CD II ------------------------------------------------------------------------------------------------------------------------------------ 2 BD+173248 STIS/C ACQ/PEA 0.2X0.0 G430M 4194 1 3 S ONBOARD ACQ FOR 3-4 CD K 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 BD+173248 STIS/N ACCUM 0.2X0.0 E230M 2707 1 1970 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 4 BD+173248 STIS/N ACCUM 0.2X0.0 E230M 2707 3 2977 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 13] Visit: 08 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD165195 STIS/C ACQ F28X50O MIRROR 1 0.2 S ONBOARD ACQ FOR 2 CD II ------------------------------------------------------------------------------------------------------------------------------------ 2 HD165195 STIS/C ACQ/PEA 0.2X0.0 G430M 4194 1 0.5 S ONBOARD ACQ FOR 3-4 CD K 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD165195 STIS/N ACCUM 0.2X0.0 E230M 2707 1 1970 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD165195 STIS/N ACCUM 0.2X0.0 E230M 2707 1 2977 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 14] Visit: 09 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD175305 STIS/C ACQ F28X50O MIRROR 1 0.2 S ONBOARD ACQ FOR 2 CD II ------------------------------------------------------------------------------------------------------------------------------------ 2 HD175305 STIS/C ACQ/PEA 0.2X0.0 G430M 4194 1 0.5 S ONBOARD ACQ FOR 3 CD K 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD175305 STIS/N ACCUM 0.2X0.0 E230M 2707 1 2195 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 15] Visit: 10 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD186478 STIS/C ACQ F28X50O MIRROR 1 1 S ONBOARD ACQ FOR 2 CD II ------------------------------------------------------------------------------------------------------------------------------------ 2 HD186478 STIS/C ACQ/PEA 0.2X0.0 G430M 4194 1 3 S ONBOARD ACQ FOR 3-4 CD K 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD186478 STIS/N ACCUM 0.2X0.0 E230M 2707 1 1970 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD186478 STIS/N ACCUM 0.2X0.0 E230M 2707 4 2977 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 16] Visit: 11 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD186478 STIS/C ACQ F28X50O MIRROR 1 1 S ONBOARD ACQ FOR 2 CD II ------------------------------------------------------------------------------------------------------------------------------------ 2 HD186478 STIS/C ACQ/PEA 0.2X0.0 G430M 4194 1 3 S ONBOARD ACQ FOR 3 CD K 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD186478 STIS/N ACCUM 0.2X0.0 E230M 2707 1 1970 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 17] Visit: 12 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD221170 STIS/C ACQ F28X50O MIRROR 1 0.3 S ONBOARD ACQ FOR 2 CD II ------------------------------------------------------------------------------------------------------------------------------------ 2 HD221170 STIS/C ACQ/PEA 0.2X0.0 G430M 4194 1 1 S ONBOARD ACQ FOR 3 CD K 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD221170 STIS/N ACCUM 0.2X0.0 E230M 2707 1 1970 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 18] Visit: 54 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD6755 STIS/C ACQ F28X50O MIRROR 1 0.3 S ONBOARD ACQ FOR 2 CD II ------------------------------------------------------------------------------------------------------------------------------------ 2 HD6755 STIS/C ACQ/PEA 0.2X0.0 G430M 4194 1 1 S ONBOARD ACQ FOR 3 CD K 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD6755 STIS/N ACCUM 0.2X0.0 E230M 2707 1 2040 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 19] Visit: 62 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD221170 STIS/C ACQ F28X50O MIRROR 1 0.3 S ONBOARD ACQ FOR 2 CD II ------------------------------------------------------------------------------------------------------------------------------------ 2 HD221170 STIS/C ACQ/PEA 0.2X0.0 G430M 4194 1 1 S ONBOARD ACQ FOR 3 CD K 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD221170 STIS/N ACCUM 0.2X0.0 E230M 2707 1 1970 S UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 8342( 5) - 10/05/99 06:32 - [ 20] Summary Form for Proposal 8342 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures F28X50OII 0.2X0.06 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 2 ONBOARD ACQ FOR 3-4 ONBOARD ACQ FOR 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G430M E230M ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD115444 HD6268 HD6755 HD122956 HD126587 BD+173248 HD165195 HD175305 HD186478 HD221170 ------------------------------------------------------------------------------------------------------------------------------------ Wavelengths 4194 2707 ------------------------------------------------------------------------------------------------------------------------------------