Measurements of the circumstellar shell geometry in IRC + 10216

Astronomy and Astrophysics – Astronomy

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Carbon Stars, Infrared Photometry, Stellar Envelopes, Brightness Distribution, Michelson Interferometers, Radiation Distribution, Spatial Distribution, Speckle Interferometry, Visibility

Scientific paper

Using speckle interferometric techniques, the authors have measured the spatial distribution of light in two infrared colors around the carbon star IRC +10216. At 2.2 μm the visibility data indicate that the brightness distribution is elongated at approximately P.A. = 20°. At 10.3 μm the distribution is more nearly circular. The authors have also measured phases in the image using the Knox-Thompson algorithm. The 10.3 μm one-dimensional images reconstructed from these phases and the visibilities show that the source is extended at all orientations. The 2.2 μm one-dimensional images, however, do exhibit the same departure from circular symmetry shown by the visibility data. The reconstructed images show that there is a general enhancement in the brightness distribution concentrated toward the north-northeast with the star offset to the south-southwest in the envelope.

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