README web version of /home/usg/OPS/MTS/readme_xml/readme_77040600

Principal Investigator Email Address

• Ruslan.Yudin@ime.spb.ru

Estimated Total Execution Time (hours, including overheads)

• 10.01

General Description

• In principle, this is a  perfectly straightforward spectropolarimetric
   program to measure circular polarization in a sample of 10 Be stars. The aim is
   to detect, for the first time in such stars, magnetic fields. For this reason, we
   could afford to select our targets from the Bright Star Catalog.
  
  The execution time for each of the 10 OBs is one hour.
  Because magnetic fields have not so far been detected in Be stars, we have no way
   of guessing, which of our targets is the most promising one.
  The extreme brightness of our targets makes the execution very easy on the one hand:
  
  o  Target identification is simple.  All objects are single and well isolated.
  
  o  The observations can be executed under THIN and even THICK conditions with any
   variable seeing.
      If the observations begin or end in twilight, this won't be a problem.
      and a bit tricky on the other one:
  o  Variations in seeing and sky transparency have extreme effects at the given exposure
      times of order 1 sec because they do not get averaged out.  Therefore, please
   check the
      exposure level after _every_ readout and adjust the exposure time if necessary.
    Yes, we
      appreciate that this is a pain in the neck.  But we need to build up the highest
   possible     S/N in the combined data in order to significantly improve on previous
   detection        thresholds. 
      Ideally, the exposure level in the continuum will be 20,000-50,000 ADU's.
      Exposure levels below 10,000 ADU's and above 60,000 ADU's will be useless.
  
  There is also the possibility that there are variations of the magnetic field within
   the execution time of an OB.  Therefore, each sub-exposure counts not only as part
   of the sum.
  We thank you in advance for your support and bearing with us!

Waiver Requests

• Waiver Request to use A,1x1,low readout mode, as well as to skip the submission
   
  of finding charts was submitted on the 19/01/05 and approved on the 26/01/05.

Critical Observing Condition Constraints

• none

Time-Critical Aspects

• none

Special Execution Requirements

• ---(Empty)---

Special Calibration Information

• Corresponding to the FORS1 calibration plan for spectropolarimetric observations,
  we expect that a polarized standard star with the exactly same setting and 
  at retarder plate angles of +45 and -45 will be taken every night when an 
  OB for our program is executed.

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 ?

• N/A

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

If you have prepared your finding charts with tools other than FIMS,
 do they comply with the specifications on the FORS1 Phase 2 web page ?

• N/A