Speckle interferometry of the central object in the giant H II region NGC 3603

Astronomy and Astrophysics – Astrophysics

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H Ii Regions, Interferometry, Speckle Patterns, Star Clusters, Supermassive Stars, Astrometry, Autocorrelation, Triple Stars

Scientific paper

The central object of the giant H II region NGC 3603 is the dense star cluster HD 97950. In various papers it has been discussed that this object may be of similar nature as the luminous central object R 136a of the 30 Doradus nebula in the Large Magellanic Cloud. Speckle interferometric observations of the dominating core AB of HD 97950 have been performed. It is found that HD 97950AB consists of at least four stars. The component B is a single star at a resolution of 0.09 arcsec. The component A is a close triple star. The separations of A2, A3 and B relative to A1 were measured to be 0.366 arcsec, 0.332 arcsec, and 0.779 arcsec, respectively. The autocorrelation of AB contains a true, diffraction-limited image of the triple star A1-A2-A3.

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