README web version of /home/usg/OPS/MTS/readme_xml/readme_76504100

Principal Investigator Email Address

• nchristlieb@hs.uni-hamburg.de

Estimated Total Execution Time (hours, including overheads)

• 06:59:30

General Description

• The program consists of UVES observations of the metal-poor star HE0557-4840,
  which we suspect to be in the "metallicity gap" of the metallicity 
  distribution function of the galactic halo, at -5.2 < [Fe/H] < -4.0. From
  moderate-resolution follow-up spectra we determined HE0557-4840 to have
  [Fe/H] = -4.4. Our aim is to confirm this metallicity, based on Fe lines, and
  to carry out a first abundance analysis of the star. 
  
  We want to use Dichroic 1 with central wavelenghts 390nm in the blue arm and
  580nm in the red arm. A slit width of 1.0'' will yield R=40,000$, and S/N=100
  per rebinned pixel shall be reached at 420nm in order to facilitate detection
  of Fe I lines in that wavelength region, and other lines important for the
  abundance analysis. 1x1 pixel binning is used because we are not readout-noise
  limited. The spectra will later be re-binned.
  
  Because the star is relatively faint (B=16.1), the observations should be
  done in grey time, as specified in the constraint set of the OBs. The seeing
  should not be worse than 1.2''.
  
  To facilitate cosmic ray removal, and to allow for flexible scheduling, the
  total exposure time is split into 6 exposures of 1 hour each.
  
  For avoiding slit losses due to atmospheric differential refraction, the slit is
  put to the parallactic angle, and the derotator mode is set to "ELEV" in the
  OBs.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• None

Time-Critical Aspects

• Target difficult to observe after February

Special Execution Requirements

• None

Special Calibration Information

• None

ToO Information

• None

ToO Activators List

• None

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• None

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 ?

• N/A

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