README web version of /home/usg/OPS/MTS/readme_xml/readme_75007501

Principal Investigator Email Address

• dmackey@ast.cam.ac.uk

Estimated Total Execution Time (hours, including overheads)

• 4.0 hours

General Description

• These are three OBs submitted to cover four hours compensation time granted
   to cover ToO observations carried out during the original visitor mode observing
   run for 075.D-0075(A) from 24-27 July 2005. 
  The observations use FLAMES/MEDUSA fibres to obtain spectra of RGB stars in globular
   clusters for the purposes of radial velocity measurments. The selected grating (HR21)
   covers the CaII triplet, and in fact the three absorption lines should be visible
   in the spectra of the brightest stars measured in each exposure (towards the blue
   end, at lambda ~ 849.8, 854.2, 866.2 nm; central wavelength is 875 mn). 
  The three present OBs cover two globular clusters -- Arp2 and M54. All three are
   taken straight from the visitor mode run, so the astrometry and FLAMES set-up has
   been previously tested and found to be fine. During the VM run we found several
   tricks which can improve the observations if necessary -- please see "Special Execution
   Requirements". In addition, please note that each of the three OBs is longer than
   the nominal SM limit of 1h; however I was assured this was acceptable given the
   circumstances (see "Waiver Requests").

Waiver Requests

• Please note each of the three OBs is longer than the nominal SM limit
   of 1h. However, these were originally VM OBs, and given the special circumstances
   I was assured the OB length was OK (ie, a waiver issued by default). Please refer
   to the original email of 27 July to usd-help@eso.org from C. Dumas for PSO, granting
   the 4h compensation time.

Critical Observing Condition Constraints

• Please observe under PHO or CLR sky conditions in seeing better than 1.0"
   and at elevation higher than 45 degrees (airmass 1.4). This should ensure the expected
   S/N.

Time-Critical Aspects

• N/A

Special Execution Requirements

• ** Under poor seeing or non-transparent sky conditions we found the selected
   guide stars occasionally problematic during the VM run. This will probably not be
   an issue for the present execution since these OBs will be carried out under good
   observing conditions; however if necessary it is possible to change the specified
   guide stars to those found at:
  Arp2: 19:28:55.2 -30:32:15.5  (very close to original GS; a little east)
  M54:  18:54:18.5 -30:30:01.4  (SSW of original GS; W of cluster centre; approach
   from N with guide probe to 			       minimize vignetting of target/sky fibres).
  Selection of these alternate guide stars will have the effect of vignetting a number
   of fibres per set-up (incuding possibly one FACB fibre for M54) so please only change
   if absolutely necessary. 
  
  ** It was found that applying a rotation of 0.08 degrees to the telescope can significantly
   improve the centering of the FACB stars. The reason for this is unknown.

Special Calibration Information

• N/A

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

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