README web version of /home/usg/OPS/MTS/readme_xml/readme_78029900

Principal Investigator Email Address

• wgieren@astro-udec.cl

Estimated Total Execution Time (hours, including overheads)

• 15:57

General Description

• The goal is to complete the radial-velocities curves for a sample of LMC
   Cepheids with an accuracy better than about 500m/s per observation. The stars have
   V magnitudes between 12 and 14.5 depending on period and phase and the bulk of the
   program was carried out in visitor mode in P76.
  
    Our velocity accuracy requirement (500m/s) is not extremely high for HARPS and
   we can
  achieve the goal easily based on the standard calibration of HARPS done in the beginning
  and end of the night.
  
    We need a S/N of around 2 in the best orders to get good fits with the G star
   template.
  
    The main complication is that we need to fill the gaps in the radial velocity
   curves and as the periods of the targets are between 18 and 48 days this leaves
   us very few chances during
  the observing period to actually catch the stars in the appropriate phases, please
   see the
  section on time-critical aspects.
  
    The provided finding charts shows the targets quite well, the Cepheids being the
   brightest
  objects within the circle in each chart.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• None

Time-Critical Aspects

• As we need to fill in the missing phases in the radial velocity curves
   we have computed the phase for each star on all the service mode nights as well
   as the technical/setup nights and checked where we have matches for each star. The
   good phase matches have been entered in the standard "Time Interval" constraint
   set for each OB and we have made an OB corresponding to each missing phase point.
   In this way a phase point is completed whenever an OB is executed.
  
    Note that many phase points can only be reached on one single night and some of
   these might even be technical nights, i.e. non service mode nights. We hope that
   it will still be possible to execute at least some of these OBs as this is really
   our only chance of completing these
  radial velocity curves. 
  
    As the periods for the stars are quite long a typical time window is 24hours long
   as given in the OB Time Interval constraint set.

Special Execution Requirements

• As some of the phases can only be observed on one specific night it is
   important that the opportunity is not missed, if at all possible. We appreciate
   whatever effort you can do to ensure this.

Special Calibration Information

• None

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 ?

• YES