README web version of /home/usg/OPS/MTS/readme_xml/readme_75081000

Principal Investigator Email Address

```
damiani@astropa.unipa.it
```

Estimated Total Execution Time (hours, including overheads)

```
2.5
```

General Description

This is a study of UV and H-alpha excesses in stars of the cluster NGC
 6530, for which deep BVI WFI
photometry already exists. This program consists of three Obs, plus two CalObs.

H-alpha excess is measured with respect to the flux in the Rc band; therefore, the
 first OB contains
both the Rc filter and the H-alpha filter observations, close enough in time to
 avoid variability
to disturb. Another OB with H-alpha only will permit to study also fainter stars.
A third OB is filled with U band observations up to its 1-hour time limit.

Since H-alpha is not part of standard WFI calibrations, we request sky flats with
 that filter.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

The U band observation is sensitive to Moon illumination, and therefore
 we require
the Moon to be below horizon. It also requires better than average sky transparency,
hence we set airmass to <1.5 (in addition to PHOTOMETRIC night).

The Rc and H-alpha observations are not very sensitive to Moon phase, we only require
 the Moon to
be more distant than 60 degrees. However, since this is a crowded field, with many
 faint stars
against a strong nebular background, we require a good seeing of (better than) 0.8
 arcsec.

Time-Critical Aspects

```
There are no time-critical constraints.
```

Special Execution Requirements

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Special Calibration Information

Since the Halpha/7 filter is not part of standard calibrations, we request
3 sky flatfields.

Photometric standards in Halpha/7 are not requested, since only the H-alpha/Rc ratio
 is of interest.

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 ?

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 ?

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 set 'New Preset' flag in all acquisition templates to 'True'?

Have all your submitted OBs the same filter for the acquisition template and for the first science template?

Did you combine calibration templates with science templates for any OB?

Did you combine imaging and spectroscopic templates for any OB?

Did you submit any Focus template?

Last creation of page: Tue Oct 6 15:40:08 2009
If you have comments, please contact usd-help@eso.org