README web version of /home/usg/OPS/MTS/readme_xml/readme_77045300

Principal Investigator Email Address

• anna@mso.anu.edu.au

Estimated Total Execution Time (hours, including overheads)

• 4.0

General Description

• The programme consists of simple UVES observations of the strongly r-process
  enhanced star HE 1523-0901.
  
  The aim of the program is the detection of the U II line at 3860 A. So far, U
  could be detected in only two other metal-poor stars. 
  Also,  wish to measure a precise Th II abundance from lines at 4019 A, 4086 A and
   4094 A.
  This abundance is crucial for an accurate U/Th ratio, on which the chronometry is
   based on.
  Furthermore, we attempt to detect Pb I and Bi I lines (3683 and 3068 A, respectively)
   which are end products of the decay of Th and Eu.
  
  We have chosen image slicer #2 and a 1x1 pixel binning. The esposure time is split
   between the BLUE 346 and the BLUE 437 settings in order to achieve a better wavelength
   coverage, and in particular, for covering the Th lines at 4019 A, 4086 A and 4094
   A, as well as the many lines of neutron-capture elements in the UV. Both settings
   cover the U II line at 3860 A, so that the S/N at that wavelength will not be decreased
   due to usage of the two settings instead of one.
  We note here that it is necessary for the U detection that we use image slicer #2.
   Thus is it not possible to switch to image slicer #1 to make use of the dicroic
   mode.
  
  2 exposures of 3000 sec each of HE1523-0901 with the BLUE 346 setting, image slicer
   #2 and a
  0.4" slit shall be taken.
  
  2 exposures of 3000 sec each of HE1523-0901 with the BLUE 437 setting, image slicer
   #2 and a
  0.4" slit shall be taken.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• NONE

Time-Critical Aspects

• NONE

Special Execution Requirements

• ---(Empty)---

Special Calibration Information

• ---(Empty)---

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• ---(Empty)---

Source(s) of Pre-imaging

• ---(Empty)---

Pre-imaging sources not listed above

• ---(Empty)---

Do all your OBs comply with the instrument-specific requirements listed
 on the instrument-specific Phase 2 web page ?

• YES

If this is a pre-imaging run, did you select PRE-IMAGING for the Observing
 Category for each Observing Template ?

• N/A

Do all your finding charts comply with both the general and instrument-specific
 Phase 2 Web Pages ?

• YES

If you submitted OBs for standard stars, did you specify the magnitude
 and spectral type of all standard stars in the OBs ?

• N/A

Have you included OBs for any calibrations that you need but which are
 not part of the Calibration Plan ?

• N/A

If you are observing Moving Targets, have you attached suitable ephemeris
 files to your OBs?

• N/A

If you have preferences which OBs should be executed first, did you make
 use of the User Priority field in the OBs ?

• YES

If this is a run that requires coordinated observations with other facilities,
 did you give proper instructions in the Time-Critical Aspects Section ?

• N/A

If you need secondary guiding, are there suitable objects within 30 arcsec
 from your target ?

• N/A