README web version of /home/usg/OPS/MTS/readme_xml/readme_76013300

Principal Investigator Email Address

```
lpasquin@eso.org
```

Estimated Total Execution Time (hours, including overheads)

```
30.5
```

General Description

This program aims at obtaining beryllium and oxygen abundances for a large
 sample of 
halo and disk stars. The ratio between alfa elements and iron vs. beryllium will
 be 
used to investigate the formation of the erly Galaxy. 

We also observe the stars in the Li region because we check if the 
stars are depleted in Li; this is the main reason why we use 2 red 
setups: to obtain halfa and Li  in one, the oxygen triplet in the other. 

Most stars have 2 Obs: each one with a Be observation, while the differ in the red
 setups. 
A few stars have only one OB:  Be UVES archive data for these stars exist, but of
 not sufficient 
S/N ratio. So they are observed only once. 

As a general rule, if possible, we would prefer that for each star 
both OBs are executed before moving to another object OB. 

No limitations have been set in seeing; in the UV, however, high airmass 
implies a very strong decrease of the signal.

Given that the stars are very bright and have hipparcos coordinates, no finding
 charts 
are associated. We will in the next weeks further check all stars to see if 
any potentially doubtful case were present.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

```
none
```

Time-Critical Aspects

```
none
```

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 ?

```
false
```

Pre-imaging Requirements

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Source(s) of Pre-imaging

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Pre-imaging sources not listed above

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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 ?

```
N/A
```

Do all your finding charts comply with both the general and instrument-specific Phase 2 Web Pages ?

```
N/A
```

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
```

If you need secondary guiding, are there suitable objects within 30 arcsec from your target ?

```
N/A
```

Last creation of page: Tue Oct 6 15:40:09 2009
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