README web version of /home/usg/OPS/MTS/readme_xml/readme_80088200

Principal Investigator Email Address

• mvandena@eso.org

Estimated Total Execution Time (hours, including overheads)

• 4.0

General Description

• NGS-assisted imaging in L' of two nearby white dwarfs surrounded by dusty
   disks.  Depending on the formation scenario of these disks, they are either expected
   to be a 0.3-0.5" across, or << 0.1".  Objective of the program is to try to
   spatially resolve these disks in an attempt to constrain the formation mechanism
   (white dwarf merger = spatially resolved disks, pre-existing material = unresolved
   disk).  In order to accurately reconstruct the spatial information, I have supplied
   two PSF reference OBs.  OB "PSF_WD2115-560" is to be executed immediately following
   the science OB "WD 2115-560", and the OB "PSF_G29-38" is to be executed immediately
   followinng the science OB "G29-38".  Apart from this, no special requirements on
   execution.
  
  In all cases the target is identical to the AO NGS star, and will be the brightest
   object within 
  the NACO field of view.
  
  The magnitude of the brightest object (which is always the target) within the NACO
   FOV is:
  
  OB "G29-38":         K = 12.7
  OB "PSF_G29-38":     K = 11.3
  OB "WD2115-560":     K = 14.0
  OB "PSF_WD2115-560": K = 11.8

Waiver Requests

• A waiver request (380.D-0882A.01.WAV) to allow a sequence of science OB
   followed by PSF reference OB lasting two hours in total was approved, with the restriction
   that the should the conditions degrade after one hour of execution the pair of OBs
   will not be repeated.

Critical Observing Condition Constraints

• Reasonable coherence time required for good AO correction.  As NGS star
   = science target (i.e. on-axis), isoplanatic angle less important.

Time-Critical Aspects

• None.

Special Execution Requirements

• The PSF reference OB "PSF_G29-38" is to be executed immediately following
   the science OB "G29-38".
  The PSF reference OB "PSF_WD2115-560" is to be executed immediately following the
   science OB "WD2115-560".

Special Calibration Information

• Two OBs for PSF calibrators, "PSF_G29-38" and "PSF_WD2115-560", are to
   be executed immediately following their respective science OBs (and naturally with
   the same AO set-up as for the science OB).  A waiver has been granted to allow this
   sequence of OBs lasting more than 1 hour to be 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 ?

• YES

If you submitted OBs for standard stars, did you specify the magnitude
 and spectral type of all standard stars in the OBs ?

• YES

Have you included OBs for any calibrations that you need but which are
 not part of the Calibration Plan ?

• YES

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 PSF reference star OBs, do the names of those OBs begin with
 PSF_ ?

• YES

If there are Finding Charts attached to your OBs, is the field-of-view
 of at least one of these charts 2' x 2' (with clearly labelled field orientation)
 ?

• YES

Have you clearly marked and labelled your wavefront reference objects
 R1, R2, R3, ... (as specified in the NAOS Preparation Software) on your Finding
 Charts ?

• YES

Have you specified the magnitude of the brightest object in the field-of-view
 for each OB ?

• YES

Are there objects in any of your fields (including standard stars) which
 are brighter than the limits specified in the User Manual and on NACO web Pages
 ?

• NO

If the previous answer is yes, have you given a list of OBs and a justification
 for the brightness limit violation in the general description field ?

• N/A