README web version of /home/usg/OPS/MTS/readme_xml/readme_81070601

Principal Investigator Email Address

```
skraus@mpifr-bonn.mpg.de
```

Estimated Total Execution Time (hours, including overheads)

```
9
```

General Description

The aim of this project is to image the close circumstellar environment
 around the Herbig Be star V921 Sco using VLTI/AMBER.
Our successful P79 AMBER-AT observations on V921Sco have shown that the object has
 a characteristic size of about 4.5 mas.
In order to obtain a sufficient sampling of the uv-plane and to measure visibilities
 in the first and second lobe of the visibility function, observations with different
 array configurations and at different hour angles are required.

As standard calibrator we choose HD159941.
In case a calibrator at earlier or later RA is needed, we have prepared OBs for
 the calibrator stars HD141687 (about 60 min earlier in RA) and HD163197 (about 60
 min later in RA).

The characteristics of our calibrator stars are:
HD141687: RA=15 52 13.15, DEC=-45 17 03.6, V=6.55, K=4.39, G5II, UD_K=0.634+/-0.044
 mas (ASPRO)
HD152040: RA=16 52 36.07, DEC=-37 35 57.7, V=6.72, K=4.58, G6III, UD_K=0.581+/-0.040
 mas (ASPRO)
HD159941: RA=17 39 20.75, DEC=-43 09 52.8, V=7.85, K=3.55, M0III, UD_H=1.081+/-0.015
 mas, UD_K=1.089+/-0.015 mas (Merand et al. 2005)
HD163197: RA=17 56 47.82, DEC=-40 23 07.8, V=6.55, K=3.89, K4IV, UD_H=0.949+/-0.013
 mas, UD_K=0.955+/-0.013 mas (Merand et al. 2005)

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

```
None.
```

Time-Critical Aspects

```
None.
```

Special Execution Requirements

```
None.
```

Special Calibration Information

```
None.
```

ToO Information

```
None.
```

ToO Activators List

```
None.
```

Is this a Pre-imaging run ?

```
false
```

Pre-imaging Requirements

```
None.
```

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 ?

```
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
```

Did you indicate for each science star OB the corresponding calibrator star OB (and vice versa) in the 'Instrument Comments' field ?

Did you check that your chosen calibrator is bright enough for the instrument mode used ?

If you use calibrator stars which are not in the CalVin database, did you specify their characteristics in the README file and in the OBs ?

Do you use the same DIT for pairs of science target and associated calibrator?

Are the magnitudes of science target and calibrator within +/- 1 mag ?

Did you verify that your coordinates are as accurate as possible (2Mass coordinates recommended) and that they include proper motions if available ?

Did you specify the LST range of the calibrators such that they cover the range from 30 min before the start of the LST range of the science target to 30 min after the end of the LST range of the science target ?

Last creation of page: Tue Oct 6 15:40:25 2009
If you have comments, please contact usd-help@eso.org