README web version of /home/usg/OPS/MTS/readme_xml/readme_75012500

Principal Investigator Email Address

• akorn@astro.uu.se

Estimated Total Execution Time (hours, including overheads)

• 28.5

General Description

• This is a project which investigates potential abundance differences between
   turnoff and subgiant stars in the metal-poor globular cluster NGC 6397. The process
   which could lead to such abundance differences is atomic diffusion acting on cosmic
   timescales.
  While the turnoff (OBs 1-12) and subgiant (OBs 13-18) stars are observed, the MEDUSA
   fibres will target stars along the subgiant branch in various hi-res "B" settings.
   The final two OBs (19 & 20) cover brighter red giants with UVES (and the subgiant
   branch with MEDUSA).
  
  OB information (not knowing where else to specify this):
  1 - 12: 
  mag(VLT guide star): 12.3
  mag(FACBs): 13.750000; 13.220000; 12.980000; 13.970000
  valid HA range: 4h 
  expected S/N (UVES target on INS.UFIB1.FIBRE=3 @ 6500 AA): 27 (UVES ETC 3.0.4)
  
  13 - 18: 
  mag(VLT guide star): 12.16
  mag(FACBs): 13.750000; 13.770000; 13.880000; 12.520000
  valid HA range: 4h
  expected S/N (UVES target on INS.UFIB1.FIBRE=3 @ 6500 AA): 26 (UVES ETC 3.0.4)
  
  19 & 20:
  mag(VLT guide star): 12.3
  mag(FACBs): 13.750000; 13.450000; 12.290000; 13.810000
  valid HA range: 4h
  expected S/N (UVES target on INS.UFIB1.FIBRE=3 @ 6500 AA): 22 (UVES ETC 3.0.4)

Waiver Requests

• A waiver request was submitted on January 27th for OBs longer than 1h.
   This waiver was approved on February 15th.

Critical Observing Condition Constraints

• There are no additional observing condition constraints beyond what is
   specified in the constraint set "std" attached to every OB. Seeing (< 0.8") is
   the most important constraint to limit fibre-entrance losses.

Time-Critical Aspects

• There are no time-critical aspects.

Special Execution Requirements

• There are no actual special execution requirements. This project was,
   however, attempted in VM in P73 and we (Andreas Kaufer, Paul Vreeswijk and I) found
   that the UCAC2 astrometry seems rotated by a tiny amount. This was inferred from
   visually inspecting the positions of the FACBs on the screen. 
  By issuing a command to UT2, Andreas Kaufer subsequently rotated the plate by 0.08
   degrees which improved the placement. 
  If this behaviour is found again, please apply such a "rotation correction" and
   make a note in the log.

Special Calibration Information

• Night-time attached-screen flatfield exposures are to be taken with every
   OB.

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 ?

• 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

Did you specify in your OBs the hour angle range for which your Target
 Setup files are valid ?

• YES

Did you specify in your OBs the magnitudes of FACBs and Guide Star for
 all your fields ?

• YES

Are the FACBs and Guide Star in the brightness ranges specified in the
 FLAMES manual ?

• YES

Did you enter the expected signal to noise in your OBs ?

• YES