README web version of /home/usg/OPS/MTS/readme_xml/readme_77018200

Principal Investigator Email Address

• piotto@pd.astro.it

Estimated Total Execution Time (hours, including overheads)

• 23

General Description

• With this observational run we plan to obtain radial velocities of about
   2500
  stars in M4 with an accuracy of less than 1 km/s.
  We observe the same stars selected for our previous program 71.D-0205, plus
  a few more objects in the cluster center.
  The comparison of these multi-epoch radial velocities will allow us to identify
   
  the binaries with periods from a few weeks to a few years, measure the binary 
  fraction with an accuracy of 0.2, and estimate their spatial distribution.

Waiver Requests

• In this observing run we asked a weiver to insert two OBs (M4_TO_a, M4_TO_b)
   where we plan to observe about 200 turn-off stars with GIRAFFE-LR06 set-up.
  The weiver (weiver ID: 077.D-0182A.01) was accepted.
  We asked this waiver because in this way we will be able to measure the reddening
   of M4 with an error of less 0.005, and, most importantly, to map its spatial distribution
   (it is known that M4 has differential reddening).
  This is very important for our more general project of collecting all the observational
   information we need to develop a realistic model of the cluster and to reach the
   final goal that is to determine the absolute age of M4.

Critical Observing Condition Constraints

• Half of our targets are relatively faint stars. For this reason we
  need a clear sky, a seeing of 1.0 arcsec, and an airmass less than 1.6
  to reach the expected S/N.
  The moon should be at least at 30 degrees from our target.

Time-Critical Aspects

• No time-critical aspect required

Special Execution Requirements

• ---(Empty)---

Special Calibration Information

• In 9 OBs (M4_BRI_a,b,c ; M4_INT_a,b,c ; M4_FAI_a,b,c) we attached a wavelength
  calibration template. By these observations we plane to solve some problems
  found in GIRAFFE pipe-lines data reduction software.

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• ---(Empty)---

Source(s) of Pre-imaging

• WFI

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