README web version of /home/usg/OPS/MTS/readme_xml/readme_82072600

Principal Investigator Email Address

```
Bengt.Gustafsson@fysast.uu.se
```

Estimated Total Execution Time (hours, including overheads)

```
25:04:35
```

General Description

We look for small (20%) abundance differences in differently evolved stars
 (main sequence, turn-off, subgiant and red-gaint stars) of the solar-metallicity
 open cluster M67. Such abundance differences would indicate that atomic diffusion
 is at work in these stars which could help resolve problems in matching the observed
 colour-magnitude diagram with isochrone computed using the latest (low) solar abundance
 mixture (see VandenBerg et al. 2007, ApJ 666, L105).

Data homogeneity is of critical importance to this project.

Waiver Requests

No Waiver Request was submitted. To optimize ToT, we opted for fewer OBs
 with OB execution times slightly exceeding the 1h limit. We accept the consequences
 regarding scheduling and possible degradation of the observing conditions after
 1h that are associated with this choice.

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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ToO Activators List

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Do all your OBs comply with the instrument-specific requirements listed on the instrument-specific Phase 2 web page ?

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 specify in your OBs the hour angle range for which your Target Setup files are valid ?

Did you specify in your OBs the magnitudes of FACBs and Guide Star for all your fields ?

Are the FACBs and Guide Star in the brightness ranges specified in the FLAMES manual ?

Did you enter the expected signal to noise in your OBs ?

Last creation of page: Tue Oct 6 15:40:27 2009
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