README web version of /home/usg/OPS/MTS/readme_xml/readme_84107203

Principal Investigator Email Address

• mfeldt@mpia.de

Estimated Total Execution Time (hours, including overheads)

• 2

General Description

• This is a programme to observe two massive young stellar objects with
   MIDI at the ATs. Note that they are just around 30 arcsec away from each other.
  These objects reside in optically very extincted regions, so they are not visible
   themselves in the optical, and offset guiding has to be performed. For both science
   targets, the same offset guide star is used. Since the available guide star is at
   the current performance limit of the ATs, it is recommended to attempt the observations
   only under favourable weather conditions and with the moon far away from the targets.
  
  Mon R2 IRS2 is the weaker and simpler of the two sources. Mon R2 IRS3 SW is much
   stronger in total flux. However, it has a neighbouring IR source just 0.85 arcsec
   away. As an additional finding chart, we put in an acquisition image from MIDI at
   the UTs for this source to show the circumstances. In the mid-infrared, our actual
   science target (IRS3 SW) is much stronger than this neighbour, the difference is
   2.5 - 3.0 mag. However, at K band, the brightness difference is not that large (1.2
   mag). Hence, we recommend especially for this source to do MIDI acquisition images
   to make sure that we are sitting on the right (bright) source and that IRIS has
   not mistakenly adopted the wrong source.
  
  Be aware that for both science targets we use Sirius A as calibrator star, so it
   is very bright in the optical as well as in the K band. We have good experience
   with this object as a MIDI calibrator from previous AT observations.
  
  For this part of the programme, we aim for one (u,v) point at the 72m baseline for
   each of the two targets, roughly placed at hour angle 0.0 h.
  Since the two targets are so close to each other (30 arcsec), an observing sequence
   of [Sirius : MonR2IRS2 : MonR2IRS3SW : Sirius] could be a practical solution for
   this (u,v) point. Please note that Mon R2 IRS2 might have a correlated flux at the
   edge of the performance limit of the ATs for this rather long baseline.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• none

Time-Critical Aspects

• none

Special Execution Requirements

• none

Special Calibration Information

• none

ToO Information

• N/A

ToO Activators List

• N/A

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• N/A

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 ?

• 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

Did you indicate for each science star OB the corresponding calibrator
 star OB (and vice versa) in the 'Instrument Comments' field ?

• YES

Did you check that your chosen calibrator is bright enough for the instrument
 mode used ?

• YES

If you use calibrator stars which are not in the CalVin database, did
 you specify their characteristics in the README file and in the OBs ?

• N/A

Did you verify that your coordinates are as accurate as possible (2Mass
 coordinates recommended) and that they include proper motions if available ?

• YES

Did you specify the LST range of the calibrators such that they cover
 the range from 30 min before the start of the LST range of the science target to
 30 min after the end of the LST range of the science target ?

• YES