The infrared development of Nova Vulpeculae 1976

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Dust, Infrared Astronomy, Novae, Stellar Envelopes, Optical Thickness, Particle Size Distribution, Radiative Transfer, Stellar Models, Time Dependence

Scientific paper

The infrared development of Nova Vul 1976 is discussed using sequences of spherical circumstellar dust shell models. The observed infrared emission may be understood as originating in a shell of changing optical depth characterized by number density and grain size distributions which increase steeply toward the outer boundary. It is possible to interpret variations in the effective temperature of the dust emission occurring near the time of the infrared maximum in terms of the changing optical depth in a dust shell incorporating a significant temperature gradient. However, a more consistent picture is shown to combine interrelated optical depth and grain size variations. The grain size reductions inferred may be at least partly explained by sputtering due to high velocity secondary ejecta.

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