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Description
Intensity interferometry has proven to be a powerful method for measuring the angular sizes of stellar objects and is increasingly regarded as a reliable technique for achieving high-resolution imaging. With current advancements in detector technology, the time resolution has improved to the point where we are able to to resolve the shape of the correlation peaks. Such sensitivity opens the door to extracting new types of information, particularly to the internal kinematics of systems. In this work we have investigated exactly this possibility. We developed numerical models to simulate the Doppler shifts of emission and absorption lines of a decretion disk and a binary system respectively and evaluated their impact on the temporal intensity correlation function. Our simulations reveal a sensitivity of the correlation function to the internal dynamics of both systems, particularly the asymmetric shift caused by the asymmetrically red and blue shifted features. These results suggest that, with sufficiently high time resolution, intensity interferometry can be used to extract qualitative information about the internal motion within stellar system, offering a complementary perspective.
