README web version of /home/usg/OPS/MTS/readme_xml/readme_77016103

Principal Investigator Email Address

```
driebe@mpifr-bonn.mpg.de
```

Estimated Total Execution Time (hours, including overheads)

```
24
```

General Description

Title: 
A mid-infared interferometric study of the circumstellar environment of dusty OH/IR
 stars.


The aim of this VLTI/MIDI proposal is to study the physical properties of the circumstellar
 environment of a small sample of highly dust-enshrouded OH/IR stars and to search
 for possibe asymmetries in the dust shell geometry. All observations of this run
 will be carried out using the ATs and the G0-H0 baseline configuration.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

he User Support Group agreed that the risky targets (--> faint Coude
 guide stars) IRAS 17004, IRAS 15408, IRAS 16327, and IRAS 15474 are replaced with
 the more suitable targets IRAS 17020, IRAS 16292, IRAS 16444, and IRAS 18172.

All 5 science targets are fainter than V=14 and, therefore, require off-axis Coude
 guiding.
The guide stars have been selected from the ESO guide star catalogue (GSC). All
 guide stars
are brighter than 13th magnitude in the visual.

science target   guide star
--------------  --------------------
IRAS16460-4022  GSC0787103315
IRAS16292-5004  GSC0833300381
IRAS16444-4527  GSC0832601574
IRAS17020-5254  GSC0872601051
IRAS18172-2305  GSC0684400786

Time-Critical Aspects

```
None
```

Special Execution Requirements

```
None
```

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 ?

```
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 ?

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 ?

Last creation of page: Tue Oct 6 15:40:12 2009
If you have comments, please contact usd-help@eso.org