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Article: Do Water Fountain Jets Really Indicate the Onset of the Morphological Metamorphosis of Circumstellar Envelopes?
Title | Do Water Fountain Jets Really Indicate the Onset of the Morphological Metamorphosis of Circumstellar Envelopes? |
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Authors | |
Keywords | Infrared: stars Radiative transfer Stars: AGB and post-AGB Stars: evolution Stars: massloss Stars: winds, outflows |
Issue Date | 2016 |
Publisher | Oxford University press, co-published with Royal Astronomical Society. The Journal's web site is located at http://www.oxfordjournals.org/our_journals/mnras/ |
Citation | Monthly Notices of the Royal Astronomical Society, 2016, v. 465 n. 4, p. 4482-4499 How to Cite? |
Abstract | The small-scale bipolar jets having short dynamical ages from “water fountain (WF)” sources are suggested to be indicating the onset of morphological metamorphosis of circumstellar envelopes of intermediate-mass stars. Such process usually happens at the end of the asymptotic giant branch (AGB) phase. However, recent studies found that WFs could be AGB stars or even early planetary nebulae. This fact contradicts to the belief that WFs are late AGB or early post-AGB stars where the deviation from spherical symmetry of the envelopes has just begun. In the present work, we aim to show that WFs do not share the same evolutionary status by studying their spectral energy distribution (SED) profiles. In particular, we found that WFs could be associated with spherical or aspherical envelopes, according to the fitting results from the radiative transfer code DUSTY. Those WFs with spherical envelopes could be AGB or very early post-AGB stars, while others with aspherical structures are very likely more evolved. These results imply that WF jets may not represent the earliest stage of the change in envelope morphology. The dynamical ages of WF jets cannot be used to justify the moment when the envelopes begin to become aspherical, nor to tell the concrete evolutionary statuses of the objects. A WF jet could be the innermost part of a larger well-developed jet, which is not necessarily a young jet. |
Persistent Identifier | http://hdl.handle.net/10722/231235 |
ISSN | 2023 Impact Factor: 4.7 2023 SCImago Journal Rankings: 1.621 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Yung, B. H. K. | - |
dc.contributor.author | Nakashima, J | - |
dc.contributor.author | Hsia, C | - |
dc.contributor.author | Imai, I | - |
dc.date.accessioned | 2016-09-20T05:21:38Z | - |
dc.date.available | 2016-09-20T05:21:38Z | - |
dc.date.issued | 2016 | - |
dc.identifier.citation | Monthly Notices of the Royal Astronomical Society, 2016, v. 465 n. 4, p. 4482-4499 | - |
dc.identifier.issn | 0035-8711 | - |
dc.identifier.uri | http://hdl.handle.net/10722/231235 | - |
dc.description.abstract | The small-scale bipolar jets having short dynamical ages from “water fountain (WF)” sources are suggested to be indicating the onset of morphological metamorphosis of circumstellar envelopes of intermediate-mass stars. Such process usually happens at the end of the asymptotic giant branch (AGB) phase. However, recent studies found that WFs could be AGB stars or even early planetary nebulae. This fact contradicts to the belief that WFs are late AGB or early post-AGB stars where the deviation from spherical symmetry of the envelopes has just begun. In the present work, we aim to show that WFs do not share the same evolutionary status by studying their spectral energy distribution (SED) profiles. In particular, we found that WFs could be associated with spherical or aspherical envelopes, according to the fitting results from the radiative transfer code DUSTY. Those WFs with spherical envelopes could be AGB or very early post-AGB stars, while others with aspherical structures are very likely more evolved. These results imply that WF jets may not represent the earliest stage of the change in envelope morphology. The dynamical ages of WF jets cannot be used to justify the moment when the envelopes begin to become aspherical, nor to tell the concrete evolutionary statuses of the objects. A WF jet could be the innermost part of a larger well-developed jet, which is not necessarily a young jet. | - |
dc.language | eng | - |
dc.publisher | Oxford University press, co-published with Royal Astronomical Society. The Journal's web site is located at http://www.oxfordjournals.org/our_journals/mnras/ | - |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | - |
dc.rights | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. | - |
dc.subject | Infrared: stars | - |
dc.subject | Radiative transfer | - |
dc.subject | Stars: AGB and post-AGB | - |
dc.subject | Stars: evolution | - |
dc.subject | Stars: massloss | - |
dc.subject | Stars: winds, outflows | - |
dc.title | Do Water Fountain Jets Really Indicate the Onset of the Morphological Metamorphosis of Circumstellar Envelopes? | - |
dc.type | Article | - |
dc.identifier.email | Hsia, C: xiazh@hku.hk | - |
dc.identifier.authority | Nakashima, J=rp00764 | - |
dc.identifier.authority | Hsia, C=rp00706 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1093/mnras/stw2931 | - |
dc.identifier.scopus | eid_2-s2.0-85014814172 | - |
dc.identifier.hkuros | 264907 | - |
dc.identifier.volume | 465 | - |
dc.identifier.issue | 4 | - |
dc.identifier.spage | 4482 | - |
dc.identifier.epage | 4499 | - |
dc.identifier.isi | WOS:000395170200055 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 0035-8711 | - |