README web version of /home/usg/OPS/MTS/readme_xml/readme_80505100

Principal Investigator Email Address

• kbrogaar@eso.org

Estimated Total Execution Time (hours, including overheads)

• 8.6

General Description

• This is observations of an unresolved eclipsing binary with the aim of
   determining the radial velocities of the components at epochs 
  where the radial velocity difference is large. The aim is to obtain precision masses.

Waiver Requests

• A Waiver Request was approved to make two continous observation sequences
   of 4.3h.

Critical Observing Condition Constraints

• The airmass should not be larger than 1.75 at any time during observations.
   Note however that depending on the date this may have to be 
  overlooked for the very end of the OB, as othervise it will not be possible to execute
   it.

Time-Critical Aspects

• The remaining observations must be done in the time intervals given in
   'Special Execution Requirements'. These are the only remaining 
  possible observing dates in period 81!
  
  NOTE THAT (except for epoch3) THE SEQUENCE WILL HAVE TO BE STARTED BEFORE THE END
   OF TWILIGHT to be able to finish the science OB before the airmass gets too high.
  Note also that for later dates the airmass restriction may have to be disregarded
   for the very end of the science OB to be able to execute it.

Special Execution Requirements

• There are two remaining epochs of observations. The possible time windows
   and corresponding observing sequence for the first of these
  is the following, which is also put in the 'time intervals' for the corresponding
   science OB:
  
  UT2008-04-25T23:00:00 - UT2008-04-27T10:00:00  SCIENCE_S986_EPOCH2_APRIL + CAL_TELLURIC_HR5501
  UT2008-04-30T23:00:00 - UT2008-05-03T10:00:00  SCIENCE_S986_EPOCH2_MAY + CAL_TELLURIC_HR5501
  UT2008-05-06T23:00:00 - UT2008-05-08T10:00:00  SCIENCE_S986_EPOCH2_MAY + CAL_TELLURIC_HR5501
  
  For the science exposures, both the target and a nearby star should be in the slit,
   see the finding chart. A rotation angle of 133.6 degrees 
  has been put in the acqusition to do this. WE HAVE BEEN INFORMED THAT CRIRES NOW
   HAS A REDUCED FIELD OF VIEW AND WE ACCEPT THAT THIS SECOND 
  STAR IS LOST FROM THE OBSERVATIONS.
  
  The telluric standard OB CAL_TELLURIC_HR5501 should be taken straight after the
   science OB, even if constraints are not met. If the conditions
  get really bad or the telescope has to close, the telluric can be taken later in
   the night, when it is again at the same airmass as the science
  target was.
  
  After either SCIENCE_S986_EPOCH2_APRIL or SCIENCE_S986_EPOCH2_MAY is completed,
   the other one should be disregarded. Instead the OB SCIENCE_S986_EPOCH3 should be
   executed (without a telluric OB) in one of the remaining time windows.

Special Calibration Information

• Since we will be using the 0.4" slit we will need flat fields to be made
   during the day with this slit.

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Do the README file and the instrument comments of the telluric stars
 OBs include the required S/N/pixel of the spectrum of the telluric star, its spectral
 type and allowed spectral range?

• YES

Do any OBs include wavelength or flatfield calibrations?

• YES

If you are observing Moving Targets, have you attached suitable ephemeris
 files to your OBs?

• N/A

If the slit viewer guide star is different from the target, are the RA
 and DEC offsets accurate to within 0.05 arcsec and do they take into account the
 relative proper motion between the two objects?

• N/A

If you have preferences which OBs should be executed first for objects
 at similar RA, did you make use of the User Priority field in the OBs?

• YES