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 |
--
JeanPhilippeBerger - 29 Apr 2009