README web version of /home/usg/OPS/MTS/readme_xml/readme_75014900

Principal Investigator Email Address

```
gdemarchi@rssd.esa.int
```

Estimated Total Execution Time (hours, including overheads)

```
25
```

General Description

This is a programme aimed at detecting the white dwarf cooling sequence
 in the globular cluster M4. It is simple imaging of three fields located about 12
 arcsec away from a relatively bright (V=13.3) reference star. We have already observed
 field M4T1 with HST/NICMOS and NACO in P73. There we proved that our dithering pattern
is sufficient to efficiently subtract the effect of the sky and cosmetics, including
 the streaking pattern on the new NACO detector. 
PLEASE DO NOT MODIFY THE SIZE OF THE DITHERING PATTERN.

Our objective is to reach the faintest possible magnitude limit within the allocated
 time, so we need to individual exposure times (DIT) as long as possible. The ones
 that we have selected allow the brightest star in the fields to always stay just
 below the saturation limit. Moreover, since we are interested in the faintest objects
 in the three fields, WE DO NOT NEED TO OBTAIN THE PHOTOMETRY OF THE BRIGHTEST STARS
 (with J=15.2, H=14.5). The brightest object is always the reference star (V=13.3).

All OBs have the same structure, namely on-target H-band imaging, slew to the guide
 star (observed in J and H to properly sample the PSF) and back on-target  for J
 band imaging.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

Sub-arcsec seeing (0.8 FWHM or better) will benefit this programme and
 has been approved in Phase I.

Time-Critical Aspects

```
No time critical aspects
```

Special Execution Requirements

The preferred order of execution of the OBs is the following: First target
 M4T1, then target M4T2 and then target M4T3.

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 ?

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 have PSF reference star OBs, do the names of those OBs begin with PSF_ ?

```
N/A
```

If there are Finding Charts attached to your OBs, is the field-of-view of at least one of these charts 2' x 2' (with clearly labelled field orientation) ?

Have you clearly marked and labelled your wavefront reference objects R1, R2, R3, ... (as specified in the NAOS Preparation Software) on your Finding Charts ?

Have you specified the magnitude of the brightest object in the field-of-view for each OB ?

Are there objects in any of your fields (including standard stars) which are brighter than the limits specified in the User Manual and on NACO web Pages ?

If the previous answer is yes, have you given a list of OBs and a justification for the brightness limit violation in the general description field ?

```
N/A
```

Last creation of page: Tue Oct 6 15:40:06 2009
If you have comments, please contact usd-help@eso.org