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dc.contributor.author
Schmid, Hans M.
dc.contributor.author
Bazzon, Andreas
dc.contributor.author
Milli, Julien
dc.contributor.author
Roelfsema, Ronald
dc.contributor.author
Engler, Natalia
dc.contributor.author
Mouillet, David
dc.contributor.author
Lagadec, Eric
dc.contributor.author
Sissa, E.
dc.contributor.author
Sauvage, Jean-François
dc.contributor.author
Ginski, Christian
dc.contributor.author
Baruffolo, Andrea
dc.contributor.author
Beuzit, Jean-Luc
dc.contributor.author
Boccaletti, Anthony
dc.contributor.author
Bohn, A.J.
dc.contributor.author
Claudi, Riccardo
dc.contributor.author
Costille, Anne
dc.contributor.author
Desidera, Silvano
dc.contributor.author
Dohlen, Kjetil
dc.contributor.author
Dominik, Carsten
dc.contributor.author
Feldt, Markus
dc.contributor.author
Fusco, Thierry
dc.contributor.author
Gisler, Daniel
dc.contributor.author
Girard, Julien H.
dc.contributor.author
Gratton, Raffaele
dc.contributor.author
Henning, Thomas
dc.contributor.author
Hubin, Norbert
dc.contributor.author
Joos, Franco
dc.contributor.author
Kasper, Markus
dc.contributor.author
Langlois, Maud
dc.contributor.author
Pavlov, Alexey
dc.contributor.author
Pragt, Johan
dc.contributor.author
Puget, Pascal
dc.contributor.author
Quanz, Sascha P.
dc.contributor.author
Salasnich, Bernardo
dc.contributor.author
Siebenmorgen, Ralf
dc.contributor.author
Stute, M.
dc.contributor.author
Suárez Valles, Marcos
dc.contributor.author
Szulágyi, Judit
dc.contributor.author
Thalmann, Christian
dc.contributor.author
Turatto, Massimo
dc.contributor.author
Udry, Stéphane
dc.contributor.author
Vigan, Arthur
dc.contributor.author
Wildi, François
dc.date.accessioned
2017-11-17T11:12:18Z
dc.date.available
2017-08-22T08:54:25Z
dc.date.available
2017-08-24T12:50:08Z
dc.date.available
2017-11-17T10:27:16Z
dc.date.available
2017-11-17T11:12:18Z
dc.date.issued
2017-06
dc.identifier.issn
0004-6361
dc.identifier.issn
1432-0746
dc.identifier.other
10.1051/0004-6361/201629416
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/210586
dc.identifier.doi
10.3929/ethz-b-000179566
dc.description.abstract
Context. R Aqr is a symbiotic binary system consisting of a mira variable, a hot companion with a spectacular jet outflow, and an extended emission line nebula. Because of its proximity to the Sun, this object has been studied in much detail with many types of high resolution imaging and interferometric techniques. We have used R Aqr as test target for the visual camera subsystem ZIMPOL, which is part of the new extreme adaptive optics (AO) instrument SPHERE at the Very Large Telescope (VLT). Aims. We describe SPHERE/ZIMPOL test observations of the R Aqr system taken in Hα and other filters in order to demonstrate the exceptional performance of this high resolution instrument. We compare our observations with data from the Hubble Space Telescope (HST) and illustrate the complementarity of the two instruments. We use our data for a detailed characterization of the inner jet region of R Aqr. Methods. We analyze the high resolution ≈ 25 mas images from SPHERE/ZIMPOL and determine from the Hα emission the position, size, geometric structure, and line fluxes of the jet source and the clouds in the innermost region <2′′ (<400 AU) of R Aqr. The data are compared to simultaneous HST line filter observations. The Hα fluxes and the measured sizes of the clouds yield Hα emissivities for many clouds from which one can derive the mean density, mass, recombination time scale, and other cloud parameters. Results. Our Hα data resolve for the first time the R Aqr binary and we measure for the jet source a relative position 45 mas West (position angle −89.5°) of the mira. The central jet source is the strongest Hα component with a flux of about 2.5 × 10-12 erg cm-2 s-1. North east and south west from the central source there are many clouds with very diverse structures. Within 0.5′′ (100 AU) we see in the SW a string of bright clouds arranged in a zig-zag pattern and, further out, at 1′′−2′′, fainter and more extended bubbles. In the N and NE we see a bright, very elongated filamentary structure between 0.2′′−0.7′′ and faint perpendicular “wisps” further out. Some jet clouds are also detected in the ZIMPOL [O I] and He I filters, as well as in the HST-WFC3 line filters for Hα, [O III], [N II], and [O I]. We determine jet cloud parameters and find a very well defined correlation Ne ∝ r-1.3 between cloud density and distance to the central binary. Densities are very high with typical values of Ne ≈ 3 × 105 cm-3 for the “outer” clouds around 300 AU, Ne ≈ 3 × 106 cm-3 for the “inner” clouds around 50 AU, and even higher for the central jet source. The high Ne of the clouds implies short recombination or variability timescales of a year or shorter. Conclusions. Hα high resolution data provide a lot of diagnostic information for the ionized jet gas in R Aqr. Future Hα observations will provide the orientation of the orbital plane of the binary and allow detailed hydrodynamical investigations of this jet outflow and its interaction with the wind of the red giant companion
en_US
dc.language.iso
en
en_US
dc.publisher
EDP Sciences
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
stars: individual: R Aqr
en_US
dc.subject
binaries: symbiotic
en_US
dc.subject
Stars: winds, outflows
en_US
dc.subject
Circumstellar matter
en_US
dc.subject
Instrumentation: adaptive optics
en_US
dc.title
SPHERE/ZIMPOL observations of the symbiotic system R Aquarii. I. Imaging of the stellar binary and the innermost jet clouds
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2017-06-08
ethz.journal.title
Astronomy & Astrophysics
ethz.journal.volume
602
en_US
ethz.journal.abbreviated
Astron. astrophys.
ethz.pages.start
A53
en_US
ethz.size
24 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Les Ulis
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::08824 - Schmid, Hans Martin (Tit.-Prof.)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::08824 - Schmid, Hans Martin (Tit.-Prof.)
en_US
ethz.relation.isSupplementedBy
handle/20.500.11850/179555
ethz.date.deposited
2017-08-22T08:54:26Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-11-20T13:41:53Z
ethz.rosetta.lastUpdated
2018-11-06T02:29:03Z
ethz.rosetta.versionExported
true
dc.identifier.olduri
http://hdl.handle.net/20.500.11850/209777
dc.identifier.olduri
http://hdl.handle.net/20.500.11850/179566
dc.identifier.olduri
http://hdl.handle.net/20.500.11850/210555
dc.identifier.olduri
http://hdl.handle.net/20.500.11850/209839
ethz.COinS
ctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.atitle=SPHERE/ZIMPOL%20observations%20of%20the%20symbiotic%20system%20R%20Aquarii.%20I.%20Imaging%20of%20the%20stellar%20binary%20and%20the%20innermost%20jet%20clouds&amp;rft.jtitle=Astronomy%20&%20Astrophysics&amp;rft.date=2017-06&amp;rft.volume=602&amp;rft.spage=A53&amp;rft.issn=0004-6361&amp;1432-0746&amp;rft.au=Schmid,%20Hans%20M.&amp;Bazzon,%20Andreas&amp;Milli,%20Julien&amp;Roelfsema,%20Ronald&amp;Engler,%20Natalia&amp;rft.genre=article&amp;
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