R 136a in the 30 Doradus
nebula resolved by holographic speckle
interferometry
Weigelt, G., Baier, G.
Astronomy
and Astrophysics 150, L18 (1985)
Abstract
Digital speckle interferometry observations of R136, the luminous
central object in the 30 Doradus nebula have been performed. It was
possible to reconstruct a diffraction-limited true image of R136a by
using R136b and R136c as the deconvolution keys (holographic speckle
interferometry). The reconstructed image shows for the first time that
R136a is a dense star cluster consisting of 8 stars within a diameter
of 1 arcsec (at wavelength approximately 710 nm). The dominating
objects are three stars of almost identical magnitudes with separations
of 0.10 and 0.48 arcsec. The reconstructed image has a resolution of
0.09 arcsec.