README web version of /home/usg/OPS/MTS/readme_xml/readme_77044001

Principal Investigator Email Address

```
feldt@mpia-hd.mpg.de
```

Estimated Total Execution Time (hours, including overheads)

```
5
```

General Description

MIDI investigation of several massive young stellar objects.

The objects are very faint in the optical, so guiding and tip/tilt correction on
 the science
targets themselves is not possible.
Since the regions mostly suffer from strong dust extinction, also the stars in the
 further
vicinity of the science targets remain faint.

With the AT's we aim for quite specific baseline length / projected position angle
combinations to complement our MIDI observations already performed with the UT's.
 This
is more or less reflected in the siderial time constraints (center of siderial time
intervall).

Since fainter calibrators like HD169916 or HD107446 have already turned out to be
 tto weak, 
we now use stronger calibrators that are however much further away from the science
 targets.
Note that one of these, HD211416, is mentioned in SIMBAD as spectroscopic binary!

We use fringe tracking at zero-OPD for AFGL4176 in order to be comparable to the
 previous
AFGL4176 measurements. For M17SWIRS1, however, we will try offset tracking. The
 respective calibrators for the two targets are also set in the same way as the science
 target ...

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

```
no constraint
```

Time-Critical Aspects

```
none
```

Special Execution Requirements

---(Empty)---

Special Calibration Information

```
none
```

ToO Information

```
not applicable
```

ToO Activators List

```
not applicable
```

Is this a Pre-imaging run ?

```
false
```

Pre-imaging Requirements

```
not applicable
```

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 ?

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 ?

```
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 ?

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 ?

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
```

Last creation of page: Tue Oct 6 15:40:13 2009
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