The Variable Reflection Nebula Cepheus A East
Klaus W. Hodapp, Eli Bressert
TL;DR
This study presents a 14-year observational analysis of the Cepheus A East reflection nebula, revealing flux variations caused by inhomogeneous and changing extinction near the illuminating source HW2.
Contribution
It provides the first long-term imaging data showing how local dust variations affect nebula brightness and structure.
Findings
Flux distribution varies over time
Obscuring material is within ~10 AU of HW2
Extinction changes cause nebula brightness variations
Abstract
We report K'-band imaging observations of the reflection nebula associated with Cepheus A East covering the time interval from 1990 to 2004. Over this time the reflection nebula shows variations of flux distribution, which we interpret as the effect of inhomogeneous and varying extinction in the light path from the illuminating source HW2 to the reflection nebula. The obscuring material is located within typical distances of approximately 10 AU from the illuminating source.
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