README web version of /home/usg/OPS/MTS/readme_xml/readme_84081000

Principal Investigator Email Address

```
luca.sbordone@obspm.fr
```

Estimated Total Execution Time (hours, including overheads)

```
18h 38m
```

General Description

The aim of the programme is to observe Mg isotopic split in the MgH band
 at 513nm to determine Mg isotopic ratios in 47 Tucanae by using IS #3 and 580 nm
 standard read arm setting. The targets are 16 upper RGB/AGB stars roughly between
 V=12.5 and V=11.9. S/N=120-130 per pixel is required at the MgH band range, resolution
 110000. Every target is to receive a single one-hour exposure. Radial velocity has
 been checked for every target to ensure membership.

Waiver Requests

Waiver 084.B-0810A.01 submitted for OB maximum execution time 1h 10m submitted
 30/07/2009, approved 04/08/2009

Critical Observing Condition Constraints

The modt critical constraint is due to the moon brightness/distance. The
 targets are bright, but the use of IS prevents a proper sky subtraction. An excessively
 strong parasite solar spectrum might skew the delicate Mg isotopic ratio measurement.

Time-Critical Aspects

```
none
```

Special Execution Requirements

```
none
```

Special Calibration Information

```
standard calibration
```

ToO Information

---(Empty)---

ToO Activators List

---(Empty)---

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 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 ?

```
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 15:40:32 2009
If you have comments, please contact usd-help@eso.org