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Radiative transfer model of the dust structures of CRL 2688

Published online by Cambridge University Press:  30 August 2012

Dejan Vinković  and
Bruce Balick
Dejan Vinković
Affiliation:
Physics Department, University of Split, Split, Croatia email: [email protected]
Bruce Balick
Affiliation:
Dept. of Astronomy, University of Washington, Box 351580, Seattle WA 98195USA email: [email protected]
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Abstract

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New Hubble images of the reflection nebula CRL 2688 from 0.6 to 1.6μm reveal significant variations of color and opacity in the distribution of scattered starlight. We have constructed a detailed radiation-transfer model consisting principally of an optically thick equatorial disk-like structure; bipolar lobes with density enhancements along the polar axis and at the base of lobes; an optically thin extended envelope containing spherical density-enhanced shells to mimic the outer rings of CRL 2688; and a pair of near-stellar caps that collimate and redden the dispersing starlight near its source. Our model nicely reproduces all of the basic features detected in the HST images, including the famous searchlights and arcs, as well as the measured spectral energy distribution (“SED”) of CRL 2688. Assuming a distance of 420 pc we estimate the light originates in a giant star with a temperature T ~ 7000 K and a luminosity L = 5500 ± 1100 L⊙.

Keywords

planetary nebulae: generalplanetary nebulae: individual (CRL 2688)circumstellar matterreflection nebulaeradiative transfer
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 520 - 521
Copyright
Copyright © International Astronomical Union 2012

References

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