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Contact: Janet Lathrop
University of Massachusetts at Amherst

Pulse Phases

Caption: These are Hubble Space Telescope 1.6 micron images taken at two epochs corresponding to pulse phases of 0 (a) and 0.3 (b). North is up and east is to the left. LRLL 54361 is the extended source to the lower left; the point source at upper right is another young stellar object, LRLL 1843. The light from LRLL 54361 subtends roughly 14" (~4,000 AU at the distance of the IC 348 region) in (a), and about 50" (~15,000 AU) in (b). Most if not all of this light is likely the result of scattering of circumstellar dust in the protostellar envelope. An apparent edge-on disk is visible in the center, and three separate structures indicative of outflow cavities extend to the northwest, southwest, and northeast. The extent and morphology of the scattered light changes substantially between epochs as a result of the propagation of the pulse peak light.

Credit: Robert Gutermuth, UMass Amherst

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