Outflows From Evolved Stars: The Rapidly Changing Fingers Of CRL 618
MetadataShow full item record
Our ultimate goal is to probe the nature of the collimator of the outflows in the pre-planetary nebula CRL 618. CRL 618 is uniquely suited for this purpose owing to its multiple, bright, and carefully studied finger-shaped outflows east and west of its nucleus. We compare new Hubble Space Telescope images to images in the same filters observed as much as 11 yr ago to uncover large proper motions and surface brightness changes in its multiple finger-shaped outflows. The expansion age of the ensemble of fingers is close to 100 yr. We find strong brightness variations at the fingertips during the past decade. Deep IR images reveal a multiple ring-like structure of the surrounding medium into which the outflows propagate and interact. Tightly constrained three-dimensional hydrodynamic models link the properties of the fingers to their possible formation histories. We incorporate previously published complementary information to discern whether each of the fingers of CRL 618 are the results of steady, collimated outflows or a brief ejection event that launched a set of bullets about a century ago. Finally, we argue on various physical grounds that fingers of CRL 618 are likely to be the result of a spray of clumps ejected at the nucleus of CRL 618 since any mechanism that form a sustained set of unaligned jets is unprecedented.
xmlui.dri2xhtml.METS-1.0.item-citationBalick, Bruce, Mart�n Huarte-Espinosa, Adam Frank, Thomas Gomez, Javier Alcolea, Romano LM Corradi, and Dejan Vinkovi?. "Outflows from Evolved Stars: The Rapidly Changing Fingers of CRL 618." The Astrophysical Journal, Vol. 772, No. 1 (Jul., 2013): 20.
Showing items related by title, author, creator and subject.
Fonfria, J. P.; Cernicharo, J.; Richter, Matthew J.; Lacy, John H. (2011-02)We present a mid-infrared high spectral resolution spectrum of CRL618 in the frequency ranges 778-784 and 1227-1249 cm(-1) (8.01-8.15 and 12.75-12.85 mu m) taken with the Texas Echelon-cross-Echelle Spectrograph (TEXES) ...
Luna, R.; Cox, N. L. J.; Satorre, M. A.; Hernández, D. A. García.; Suarez, O.; Lario, P. G. (2008-03)In this work we present the results of a systematic search for diffuse bands (DBs, hereafter) in the circumstellar envelopes of a carefully selected sample of post-AGB stars. We concentrated on analyzing 9 of the DBs most ...
Clayton, Geoffrey C.; De Marco, Orsola; Nordhaus, Jason; Green, Joel; Rauch, Thomas; Werner, Klaus; Chu, You-Hua (2014-06)Only a few percent of cool, old white dwarfs (WDs) have infrared excesses interpreted as originating in small hot disks due to the infall and destruction of single asteroids that come within the star's Roche limit. Infrared ...