R 136a in the 30 Doradus nebula resolved by holographic speckle interferometry
Weigelt, G., Baier, G.
Astronomy and Astrophysics 150, L18 (1985)
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.