README web version of /home/usg/OPS/MTS/readme_xml/readme_78054203

Principal Investigator Email Address

• sstefl@eso.org

Estimated Total Execution Time (hours, including overheads)

• 23 minutes

General Description

• The result of this program is a single spectrum of the bright Be star
   zeta Tau to be used:
  a) to define the parameters of the interferometric AMBER observations to be executed
   on Dec 11/12, 2006  with the aim to detect and model the global (density wave) oscillations
   in the circumstellar disk of 
  the star. The period of the oscillation is 1500 days.
  b) to model the emission lines (Br gamma and He I 2.06) consistently with the interferometric
   and polarimetric observations of the circumstellar disk.

Waiver Requests

• The execution time of 0.4 hour was approved by Fernado Comeron on August
   4, 2006. This permits us to increase NDIT to meet the service rules for the telescope
   offsets (>1min).
   
  Observations of the target of V-3 mag giving a CCD integration level higher than
   the linearity limit
  (Waiver ID:  78.D-0542D.01) was approved on August 8, 2006.
  
  The lower the flux yielding the integration level well within the linearity range
   should be obtained by:
  a)  executing the OB under inferior weather conditions - seeing worse than 2.0 and/or
   airmass larger than 2.0 and/or thick clouds are acceptable.
  b) if still necessary, placing the star slightly out of the slit.

Critical Observing Condition Constraints

• The star is very bright V= 3.03 mag. The ISAAC observations can be executed
   almost under any conditions, including thick clouds. In fact, the poor weather conditions
   can help to solve the problem of the too 
  high  brightness of the target.

Time-Critical Aspects

• In order to use the ISAAC spectrum both for modeling of the disk and definition
   of the AMBER observations, we need to execute it not too early before our AMBER
   run (to minimize the effect of disk variability) but some days before the AMBER
   run in order to have still some time to reduce and analyze the ISAAC spectrum and
   prepare the AMBER observations. Because no ISAAC service observations are scheduled
   for early December, the period Nov 23 - 28 is the best available choise. Please
   do not 
  execute the observations earlier.

Special Execution Requirements

• The target is so bright that even for the minimum DIT and slit width the
   Hawaii CCD is not saturated 
  (close to 50 % of the saturation level, but the integration is well above the linearity
   limit.
  If  possible we ask to place the target slightly out of the slit to reduce the flux
   by 30-50 %.

Special Calibration Information

• Standard calibration is sufficient.

ToO Information

• None

ToO Activators List

• None

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• None

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

If you submitted OBs for standard stars, did you use the provided StandardStar
 templates ?

• N/A

If you are using a specific offset pattern or position angle, did you
 check carefully the definition in the manual ?

• N/A

If you are doing spectroscopy, did you draw the slit on the Finding Charts
 ?

• N/A

Did you enter the magnitude of the brightest star in the field-of-view
 in the 'Instrument Comments' field of each OB ?

• YES

If you use the MoveToPixel acquisition, have you given clear instructions
 on the FC and in the OB comment section as to how the field should be centered ?

• N/A