README web version of /home/usg/OPS/MTS/readme_xml/readme_81075801

Principal Investigator Email Address

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

Estimated Total Execution Time (hours, including overheads)

```
3
```

General Description

Using VLTI/AMBER spectro-interferometry we want to measure the geometry
 of the inner circumstellar environment around the young high-mass star M8E-IR.
The target is deeply embedded and practically invisible at visual wavelengths; therefore
 an off-axis star has to be used for telescope guiding.
For this, two stars seem suited, namely GSC S301203256747 (R=14.0, RA=18:04:55.650,
 DEC=-24:26:26.98, distance 36") and GSC S301203256746 (R=13.7, RA=18:04:56.207,
 DEC=-24:26:25.54, distance 43"). Since it is located slightly closer to the target,
 we have specified GSC S301203256747 in the science target OBs.

As DIT, we choose 25 ms in order to obtain a good absolute calibration on the measured
 visibilities.  In case this DIT is not sufficient to detect fringes on all three
 baselines, please increase it accordingly.  For the calibration, we recommend to
 use the star HD172051 (standard calibrator, with an RA about 30 min later than M8E-IR).
  If a calibrator at earlier RA is required, we have prepared OBs for HD154088 (RA
 about 60 minutes earlier than M8E-IR).

PLEASE NOTE: These OBs can equally well also be executed using the UT1-UT2-UT3 baseline
 (then also in the larger LST range 13:39 - 22:31).

The characteristics of our calibrator stars are:
HD154088: RA=17 04 27.83, DEC=-28 34 57.3, V=6.59, K=4.76, K0V, UD_K=0.521+/-0.036
 mas (ASPRO)
HD172051: RA=18 38 53.42, DEC=-21 03 05.6, V=5.87, K=4.23, G5V, UD_K=0.653+/-0.045
 mas (ASPRO)

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 ?

```
N/A
```

If this is a pre-imaging run, did you select PRE-IMAGING for the Observing Category for each Observing Template ?

Do all your finding charts comply with both the general and instrument-specific Phase 2 Web Pages ?

```
N/A
```

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 ?

```
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 ?

```
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 ?

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

```
N/A
```

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