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OUTFLOWS FROM EVOLVEDSTARS: THE RAPIDLYCHANGING FINGERS OFCRL 618 Bruce BalickM. Huarte-EspinosaAdam Frank2013 год

OUTFLOWS FROM EVOLVED STARS: THE RAPIDLY CHANGING FINGERS OF CRL 618
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Аннотация: 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.
Год издания: 2013
Авторы: Bruce Balick, M. Huarte-Espinosa, Adam Frank, Thomas Gomez, J. Alcolea, R. L. M. Corradi, Dejan Vinković
Издательство: IOP Publishing
Источник: The Astrophysical Journal
Ключевые слова: Gamma-ray bursts and supernovae, Astrophysics and Star Formation Studies, Stellar, planetary, and galactic studies
Другие ссылки: The Astrophysical Journal (PDF)
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arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
Texas ScholarWorks (Texas Digital Library) (PDF)
Texas ScholarWorks (Texas Digital Library) (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
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