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Assigned ID: 451
----- Attempting Submission 1 (Fri Apr 05 14:23:46 GMT 2019) -----
Update of buffer times when using 0.2x0.2 slit,
-1688432002
----- Attempting Submission 1 (Wed Jul 24 04:18:43 GMT 2019) -----
----- Attempting Submission 2 (Sun Oct 06 18:47:47 GMT 2019) -----
----- Attempting Submission 3 (Mon Nov 25 04:25:57 GMT 2019) -----
----- Attempting Submission 4 (Fri Dec 06 03:34:53 GMT 2019) -----
Testing r-process nucleosynthesis models with two r-process enhanced stars
Recent years have seen extensive progress in our understanding of the rapid neutron capture ("r-") process, responsible for the production of the heaviest elements in the Universe, especially with the discovery that neutron star mergers can produce these elements in kilonovae. However, several key questions about the detailed composition of r-process nucleosynthesis remain unanswered. Two critical unknowns are whether the ratio of high-opacity lanthanides to other r-process elements varies or is universal; and why some stars have boosted abundances of the high-opacity and radioactive actinides ("actinide boost stars"). Both of these variations can drastically affect neutron star merger kilonova light curves, but cannot currently be directly measured in those kilonovae. Metal-poor star abundance patterns can be used to understand such variations. This proposal aims to observe two r-process enhanced stars from which abundances of 2nd and 3rd peak elements can be measured. Combining abundances derived with near-UV spectroscopy with those from optical spectroscopy will provide a full r-process abundance pattern for the two stars which can be used to test components of current r-process models like fission fragment distributions and fission cycling.
The goal of this observing program is to collect E230M c2707 R~30000 spectra of two stars, J0051-1053 and J0538-5904.
Both targets are non-variable, metal-poor Pop II stars. Because the targets are non-variable, spectra can be collected at any time with no constraints.
Our S/N goals are 50/1 for J0051-1053 and 30/1 for J0538-5904 at 2385 Angstroms. This can be obtained in 12 orbits for J0051-1053 and 5 orbits for J0538-5904 including overheads.
Observations have been grouped into 2- or 3-orbit visits to minimize overhead and maximize scheduling flexibility.
For the 3-orbit visits, there should be five exposures. Orbit 1: ACQ, ACQ/PEAK, and SCIENCE. Orbit 2: SCIENCE. Orbit 3: SCIENCE.
For the 2-orbit visits, there should be four exposures. Orbit 1: ACQ, ACQ/PEAK, and SCIENCE. Orbit 2: SCIENCE.
Acquisition exposure times are computed with STIS target acquisition exposure time calculator targeting S/N=40 and employing the F25ND3 filter for bright targets for initial acquisition and the 0.2x0.05ND slit for maximum precision for acquisition peak.
The PI and Co-I's of this proposal all have extensive experience in spectroscopy and in particular abundance analysis of metal-poor and r-process enhanced stars. Several team members also have ample experience working with near -UV HST spectroscopic data.
Stellar Physics
6
false
false
true
false
false
false
false
SUPPORTED
STAR
HALO
POPULATION II
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
J2000
STAR
HALO
POPULATION II
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
J2000
STIS/NUV-MAMA
Spectroscopic
No
No
E230M
2707
STIS/NUV-MAMA
Spectroscopic
No
No
E230M
2707
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