README web version of /home/usg/OPS/MTS/readme_xml/readme_78028200

Principal Investigator Email Address

```
dfedele@eso.org
```

Estimated Total Execution Time (hours, including overheads)

```
2
```

General Description

The project is aimed at studying the evolution of accretion process in
 pre-main-sequence stars as traced by the H_alpha emission. This will be possible
 through multi objects spectroscopy of a big number of members of 7 yooung open clusters.
 The clusters were selected to have different ages. This will allow us to trace the
 accretion evolution at different evolutionary states.
The multi objects spectroscopy will be carried out with the run B. This is the pre-imaging
 run of the 7 clusters. Three exposures of 5, 30 and 60 sec, in the R band for each
 cluster are requested in order to have an (almost) complete acquistion of the cluster's
 members.

Waiver Requests

The Taurus-Auriga association is very low on the sky of Paranal (dec:
 +25). Due to the restriction imposed by the lack of atmospheric correction in VIMOS,
 the observation of this cluster needs a waiver in order to be observed at airmass
 bigger than 1.5 (it never rises above 1.5 airmass).
The waiver request was approved:  078.C-0282A.01.WAV

Critical Observing Condition Constraints

No critical observing condition constraints required

Time-Critical Aspects

```
No time critical aspects needed
```

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 ?

```
true
```

Pre-imaging Requirements

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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 ?

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 specify suitable guide stars for all your OBs using Guidecam ?

Did you check that the chosen guide stars are suitable for all the offset positions and that they do not produce unacceptable vignetting of the field of view ?

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