README web version of /home/usg/OPS/MTS/readme_xml/readme_80050700

Principal Investigator Email Address

```
phywjmdw@ast.leeds.ac.uk
```

Estimated Total Execution Time (hours, including overheads)

```
13.5
```

General Description

1) The aim is to determine the geometry of the near-infrared excess observed
 in three massive young stellar objects: G203, G310, G332. AMBER should resolve the
 c continuum of our 3 targets in the HK-band. The targets have K-band magnitudes
 of 4.9, 4.9 and 5.9. What the correlated K-magnitude is, is not known. The stars
 are  very red with H-K values of 3. It could therefore be difficult to get fringes
 in H-band. Two of three targets (G310, G332) are observable in March, the third
 target G203 for the full period of CYCLE80. 

2) Interferometric calibrator stars have been chosen using Calvin and ASPRO. Their
 magnitudes are within 1 K-magnitude brighter than target object, and chosen to be
 unresolved. Finding a suitable calibration star for the target G332 (K=5.9) was
 quite difficult. CalVin only returns
relatively bright stars. 

  TARGET	calib_NAME	RA		DEC		V	K	sp.type	diameter Source of diameter         Viscalc
  G203		HD  63838	07:50:53.43    00:04:46.40      6.4     3.5     K2III   0.96 
    Calvin M04                 OK       
  G310		HD 109963	12:39:12.4199 -49:03:59.090	7.7	4.1	K3III	0.79     Calvin M04
                 OK
  G332		HD 129858	14:46:28.9936 -47:26:28.017	5.7	5.5	A1V	0.52	 ASPRO spectro-photometry
   OK

3)Coude guide:
  Target stars are invisible in the V-band! Coude guide stars are well within 57.5"
 from target.
  
  target  coude guide  catalogue  Fmag (R)   Kmag   distance  remarks
  G203    N825025022   GSC2.3.2   16.2       11.9    48"      strongly reddened
 star. One other bright star could be used for guiding. It is found             
                                                   at 06:41:09.09  +09:30:09.6 (d~43").
 It is a periodic variable, which can be brighter                               
                                than V=16.2 
  Important note on G203: the target has an optically visible extended nebula. 
  The science target G203 may therefore be used as a coude guide star, if the off-axis
 
  coude guide star doesn't work (as it didn't last december 2007). 
  G310    S7MR070952   GSC2.3.2   14.5       11.4    12"  
  G332    S8TB006948   GSC2.3.2   13.5       11.2    28"

4) Baselines, and observations risk spread related to UV coverage:
UV-coverage: G203 : 4 observations per U1-U3-U4 configuration -> 12 UV points
	     G310 : 3 observations per U1-U3-U4 configuration ->  9 UV points
	     G332 : 2 observations per U1-U3-U4 configuration ->  6 UV points

NOTE: Observations can also be executed with U1-U2-U4


5) Finding charts. As the three target stars are invisible in V-band! We have made
 the finding charts in J-band. In J-band G332 is of 15th 
magnitude and not very well visible, whereas G203 and G310 are bright in J.

6) TARGET VISIBILITIES in the SCI_* OBs :
We do not know the correlated magnitude of the targest, and to avoid OB error we
 have put it to an arbitrary value of 0.2.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

```
photometric
seeing < 0.8"
airmass < 2.0
```

Time-Critical Aspects

Two targets are decently observable in March.

Special Execution Requirements

UV coverage is critical to these observations. T
he OBs have been split into hour angle intervals. 
There are 4 H.A. intervals of G203, 3 H.A. intervals for G310 and 2 H.A. intervals
 for G332.

Special Calibration Information

Interferometric calibrator stars have been chosen using ASPRO. The magnitudes
 are within 1 K-magnitude brighter than target object, and chosen to be unresolved.
  TARGET	calib_NAME	RA		DEC		V	K	sp.type	UD-VK	UD-VR	UD-BV	Source of diameter  
      Viscalc
  G203		HD  50371	06:53:22.4008 +10:59:47.940	6.3     4.1	K0III	0.760	0.898	0.775	spectro-photometry
 (I/280) OK
  G310		HD 121280	13:56:04.5929 -55:57:10.999	6.8	4.6	K0III	0.597	0.719	0.597  
 spectro-photometry (I/280) OK
  G332		HD 146481	16:19:20.8606 -54:30:48.943	7.2	5.5	G4V	0.378	0.378	0.335   spectro-photometry
 (I/280) OK

The source catalogue (vizier I/280) is Kharchenko et al. 2001 "The all-sky catalogue
 of 2.5million stars"

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

---(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 ?

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 ?

```
N/A
```

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

```
N/A
```

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 ?

```
N/A
```

Last creation of page: Tue Oct 6 15:40:21 2009
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