Gout09OifitsGeneration < Jmmc/Software

%TOC%

---+ Instructions to generate fits:

Typical header with required keywords/values:

  SIMPLE  =                    T         /

  BITPIX  =                   -32        /IEEE real 4. Other values: 16, 32, 64, -64
                                         /for 16, 32, 64: use BSCALE and BZERO keys.

  NAXIS   =                    3 /datacube

  NAXIS1  =                  512 /size 1st axis. Possible values: 512, 1024, 2048

  NAXIS2  =                  512 /size 2nd axis, see above

H & K band: resolution ~100, N band (8.7-13.1mic) band:  R~30. The 3rd axis is the spectral axis. 20 spectral elements are reasonable:

  NAXIS3  =                   20 /size 3rd (spectral) axis. 20 spectral elements
                                                                                 , 
Values of the two spatial axis:

Pixels scale is 0.1 millisec for H and K images/cubes, 1mas /pixel for N band

  CRVAL1  =  0                   / center is at 0 offset on sky (Right Ascension)

  CRPIX1  =  256                 / reference pixel would be pixel 256 if NAXIS1=512

  CDELT1  = -0.4848136811095E-10 / increment between pixels is is 0.1 millisec (IN RADIANS: MANDATORY),and is 'astronomy oriented (negative)'

  CRVAL2  =  0                   / center is at 0 DEC offset on sky

  CRPIX2  =  256                 / reference pixel is 256 in Delta

  CDELT2  =  0.4848136811095E-10 / increment is 0.1 millisec.

values for the spectral axis:

  CTYPE3  = 'WAVELENGTH'         / MANDATORY: means that Cxxxx3 are in Microns

  CRPIX3  =  1                   / reference pixel(channel) is 1 on 3rd axis

  CRVAL3  =  2.2                 / 2.2 microns for this pix/channel

  CDELT3  =  0.02                / microns channel width

Other mandatory keywords

     MAGV = 3.3 / magnitude V of star ( for AO)

     MAGK = 6.6 /K mag for FT
     MAGH = 4.4 /H mag for FT 

  TOTFLUX = 2.5434E12 /Total flux in the image or cube.

The image's values can be in any unit. More keywords are recomended that can give a better view of what is inside the fits file:

  OBJECT  = 'HD 86554'           / name (for bookeeping)

  RA      =  0.6800000000000E+02         / Right Ascension RADIANS (for bookeeping)

  DEC     =  0.2600000000000E+02         / Declination RADIANS (for bookeeping)

  EPOCH   =  2008         / Epoch (for bookeeping)

  EQUINOX =  2008         / Equinox (for bookeeping)

  ORIGIN  = 'MY Simulator'        /

  DATE-OBS= '2005-12-02T00:00:00.00'     / Date image/cube produced.

---+ Interferometers configuration:

This first table contains the proposed configurations. The spectral resolution is here to improve the (u,v)
coverage. For CHARA I am waiting for John's response.

| Config # |Interferometer | Number of telescopes | Time for one calibrate point | Spectral resolution |Filter |
| 1| Gravity/Matisse/VSI | 4 T | 40 mn | 7 spectral channels |H,K,N|
|2| VSI | 6 T | 40 mn | 7 spectral channels |H,K|
|3| MROI| 6 T (3x4) | 20 mn | 7 spectral channels |H,K|
|4| CHARA| 6 T  |  |  ||


---+ Information on images:

|Topic | Author | Band | Info/comment| Oifits Generated (Y,N) | Image reconstruction |
| AGN| S. Hoenig | | No inclination, low contrast except N, asked for more|||
|         |                  |H | Config 1(4T VLTI) |No |No|
  |         |                  |K | Config 2(6T VLTI) |No |No|
    |         |                  |N | Config 3(6T MROI) |No |No|
| Planet in disk | H. Jang-Condell | | Low contrast, asked for images with gaps| ||
|         |                  |H | Config 1(4T VLTI) |No |No|
  |         |                  |K | Config 2(6T VLTI) |No |No|
    |         |                  |N | Config 3(6T MROI) |No |No|
| Supergiant | A. Chiavassa || Convection cells|||
|         |                  |H | Config 1(4T VLTI) |No |No|
  |         |                  |K | Config 2(6T VLTI) |No |No|
    |         |                  |N | Config 3(6T MROI) |No |No|
|Evolved star | T. Verhoelst|| Low contrast envelop shells, circular symmetry, asked for more |No |No|
|         |                  |H | Config 1(4T VLTI) |No |No|
  |         |                  |K | Config 2(6T VLTI) |No |No|
    |         |                  |N | Config 3(6T MROI) |No |No|





-- Main.JeanPhilippeBerger - 29 Apr 2009
This topic: Jmmc/Software > AtelierGoutelas > Gout09OifitsGeneration
Topic revision: r1 - 2009-04-29 - JeanPhilippeBerger