README web version of /home/usg/OPS/MTS/readme_xml/readme_78075001

Principal Investigator Email Address

```
verhoeff@science.uva.nl
```

Estimated Total Execution Time (hours, including overheads)

```
25 hours
```

General Description

Dust evolution in Herbig Be stars.

We intend to determine the disk minerology, structure and evolution of Herbig Be
 stars. Most of these massive stars are still shrouded in their natal clouds and
 other nebulosity. This is why the high spatial resolution spectroscopic data of
 VISIR is vital in order to diffentiate the minerology of the disks from that of
 their surroundings as observed in the bigger beam of ISO and Spitzer. Subsequently
 we will compare the disk structure and evolution to those of the lower mass Herbig
 Ae and T Tauri stars for which comprensive studies have been completed.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

```
None
```

Time-Critical Aspects

```
None
```

Special Execution Requirements

Please place the peak flux of the targets in the slit-center.

Special Calibration Information

For every science OB two calibrator OBs have been provided. One is a zenit
 source and the other is one with airmass similar to the science target. This observation
 strategy allows for an interpolated airmass correction. The desired order is stated
 in the User Comment of the science OB. All sequences have the order: CAL_B, science,
 CAL_A.

Good Luck!

ToO Information

```
N/A
```

ToO Activators List

```
N/A
```

Is this a Pre-imaging run ?

```
false
```

Pre-imaging Requirements

```
N/A
```

Source(s) of Pre-imaging

---(Empty)---

Pre-imaging sources not listed above

---(Empty)---

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 ?

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 ?

```
N/A
```

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 the provided finding chart is at a different wavelength than the observations, did you clearly describe in the README file how to identify the target?

```
N/A
```

Did you specify a guide star brighter than V=12mag within a field of r=5arcmin around the science target?

```
N/A
```

Last creation of page: Tue Oct 6 15:40:17 2009
If you have comments, please contact usd-help@eso.org