README web version of /home/usg/OPS/MTS/readme_xml/readme_83079500

Principal Investigator Email Address

```
w.j.m.dewit@leeds.ac.uk
```

Estimated Total Execution Time (hours, including overheads)

```
23hours
```

General Description

* The aim is to resolve the envelope if massive young stellar objects
in the MIR. This envelope is expected to be close to spherical,
and it is expected that the envelope will just barely be resolved,
that is just a bit broader than the PSF. Crucial is to get a good SNR 
in the wings of the profile (at 1% of the peak flux),
and a very well sampled PSF.

* All MYSO source are the brightest in their respective fields.

* The (two times) three PSF OBs observe a few of the 
brightest stars in  the sky and the finding chart 
is a saturated K-band image. We would like
these OBs to be executed before or after 

the execution of an OB series in the same night. 

* Guide stars have been chosen using the Guidecam tool with 11

Waiver Requests

SUBMITTED: Tue 27-1-09

Override: the single consecutive OB execution requirement.

Reason: We aim to resolve with VISIR the circumstellar emission of
a sample of massive YSOs. The shape of the profile is crucial and
high quality images are required especially for the shape of
the profile far out in the wing. Five of our 21 targets require an
execution time longer than 1 hour. We request the execution of
single OB of 1.9 hours for the faint sources.

APPROVED: Thu 29-1-09 by Christian Hummel

Critical Observing Condition Constraints

```
NA
```

Time-Critical Aspects

```
NA
```

Special Execution Requirements

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Special Calibration Information

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ToO Information

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ToO Activators List

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Is this a Pre-imaging run ?

```
false
```

Pre-imaging Requirements

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Source(s) of Pre-imaging

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Pre-imaging sources not listed above

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Do all your OBs comply with the instrument-specific requirements listed on the instrument-specific Phase 2 web page ?

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 ?

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

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

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 the provided finding chart is at a different wavelength than the observations, did you clearly describe in the README file how to identify the target?

Did you specify a guide star brighter than V=12mag within a field of r=5arcmin around the science target?

Last creation of page: Tue Oct 6 15:40:30 2009
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