README web version of /home/usg/OPS/MTS/readme_xml/readme_78032100

Principal Investigator Email Address

```
guy.perrin@obspm.fr
```

Estimated Total Execution Time (hours, including overheads)

```
8h
```

General Description

This observation is part of a coordinated program between VLTI, the Keck
 interferometer and VLBA to observe late-type mass-losing stars. VLTI and Keck observations
 in the mid-infrared (for each hemisphere) measure the size of molecular and dust
 shells around these late-type stars. VLBA observations detect and measure the SiO
 masers around these objects. The goal is to be able to connect the masers, the molecular
 and dust shells with a consistent view of the objects to understand the process
 of dust formation in these objects.

None of the science targets have a well determined diameter and therefore visibility
 in the N band. Correlated fluxes have been determined from a model and there may
 be descripancies with what is observed. The  photometry of all these soources is
 also variable by a large amount in the visible. Depending when the source is observed,
 using a nearby target for pointing may be useful.

V 1951 SGR was not bright enough to be visible at the time the image used for the
 finding chart was taken. But the star is at the center of the finding chart provided
 as indicated by the arrow. Should V 1951 SGR not be detectable at the time of the
 observation (the V magnitude varies between about 8 and 14), spend the equivalent
 time on any other target of the program (choose the most appropriate target to optimize
 observing time).

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

```
None
```

Time-Critical Aspects

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None
```

Special Execution Requirements

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None
```

Special Calibration Information

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None
```

ToO Information

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None
```

ToO Activators List

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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
```

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

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

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