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Bandwidth smearing is a chromatic aberration due to the finite frequencybandwidth. In long-baseline optical interferometry terms, it is when theangular extension of the source is greater than the coherence length of theinterferogram. As a consequence, separated parts of the source will contributeto fringe packets that are not fully overlapping; it is a transition from theclassical interferometric regime to a double or multiple fringe packet. Whilestudied in radio interferometry, there has been little work on the matter inthe optical, where observables are measured and derived in a different manner,and are more strongly impacted by the turbulent atmosphere. We provide here theformalism and a set of usable equations to model and correct for the impact ofsmearing on the fringe contrast and phase, with the case of multiple stellarsystems in mind. The atmosphere is briefly modeled and discussed.

Bandwidth smearing in optical interferometry: Analytic model of the transition to the double fringe packet