Publications of the MPIfR
Optical & Infrared
Interferometry Group
Speckle
reconstruction:
Scanned original
(600dpi) - Fig.6
|
Long-exposure image derived from speckle interferograms (after
compensation of image motion):
Scanned original
(600dpi) |
Speckle
interferogram:
Scanned original
(600dpi) - Fig.1
|
Pehlemann, E., Hofmann, K.-H., Weigelt,
G.
Photon bias compensation in triple correlation
imaging and observation of R 136
Astronomy & Astrophysics, 256, pg.701-714
(1992)
Abstract
We report diffraction-limited speckle masking observations of the
central object R 136 in the 30 Doradus Nebula, and we describe a new
method for the compensation of the 4-dimensional photon bias terms in
the average bispectrum. More than 40 stellar components are present in
the 4.9 x 4.9 arcsec field of view of our reconstructed images. The
closest binaries found have separations between 0.03 and 0.05 arcsec.
Because of the large number of photon events in our speckle
interferograms, it was not possible to apply photon counting
techniques.
Therefore, the extended photon events caused various
frequency-dependent
bias terms in the average image bispectrum. To overcome this influence
of photon noise, we have developed a new technique for the compensation
of the 4-dimensional photon bias terms in the bispectrum. We describe
the theory of the method and demonstrate its feasibility by various
image reconstruction experiments.
You can get this publication ...
