README web version of /home/usg/OPS/MTS/readme_xml/readme_83503900

Principal Investigator Email Address

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kfb@phys.au.dk
```

Estimated Total Execution Time (hours, including overheads)

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2
```

General Description

This is observations of two unresolved eclipsing binaries, V35 and V61,
 in the open cluster NGC 6791, to determine their cluster membership status from
 radial velocity measurements.
The observations of V35 are completed, one epoch of V61 remains.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

The target is at declination +37 and therefore always at high airmass.
 Therefore the target can only be observed in a small time interval during the night,
 when the airmass is lower than 2.7, and preferably lower than 2.5

Time-Critical Aspects

```
Observations can be done on any night.
```

Special Execution Requirements

For the purpose of membership dertermination wavelength calibration accuray
 is not critical. However, if the target turn out to be a cluster member, these observations
 will be used, in combination with additional ones, to measure accurate masses of
 the binary components from radial velocities. For that purpose wavelength accuracy
 is important and therefore we have attached a ThAr calibration exposure to each
 OB.

Special Calibration Information

We have attached a ThAr exposure to each OB because we need high wavelength
 accuracy for high accuracy radial velocities.

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 ?

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N/A
```

Have you specified the S/N ratio at given wavelength in the User Comments field of each OB?

Have you included OBs for any calibrations that you need but which are not part of the Calibration Plan ?

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N/A
```

If you are observing Moving Targets, have you attached suitable ephemeris files to your OBs?

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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 ?

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N/A
```

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

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N/A
```

Last creation of page: Tue Oct 6 15:40:31 2009
If you have comments, please contact usd-help@eso.org