README web version of /home/usg/OPS/MTS/readme_xml/readme_81022404

Principal Investigator Email Address

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

Estimated Total Execution Time (hours, including overheads)

```
0.5
```

General Description

MIDI + VISIR observations of the dusty environment of the rapidly-evolving
 born-again AGB star FG Sge.  The aim is to study how and where dust forms 
in this unique object by combining the high-spatial mid-IR observations and radiative
 transfer modeling.  The Q-band VISIR photometry provides an 
important constraint on the slope of the SED at wavelengths where photometric data
 are scarce.  Since the object shows irregular, unpredictable 
declines in its visible light curve, it is preferable to execute all runs (081.D-0224A/B/C/D/E)
 as close in time as possible, in order to avoid 
possible temporal variations.  
The attached finding chart is a K-band image, but the object is the brightest source
 in the mid-IR in the field of view of VISIR.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

The OB should be carried out under the CLEAR condition with an optical
 seeing better than 1.2" and airmass smaller than 1.5.  Also, it would be preferable
 to execute the observation under low water vapor, pwv lower than about 2.5 mm.

Time-Critical Aspects

```
NONE
```

Special Execution Requirements

```
NONE
```

Special Calibration Information

```
NONE
```

ToO Information

```
NONE
```

ToO Activators List

```
NONE
```

Is this a Pre-imaging run ?

```
false
```

Pre-imaging Requirements

```
NONE
```

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 ?

```
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 15:40:23 2009
If you have comments, please contact usd-help@eso.org