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Very Large Telescope Interferometer observations of the dust geometry around R Coronae Borealis stars

Identifieur interne : 001480 ( Istex/Corpus ); précédent : 001479; suivant : 001481

Very Large Telescope Interferometer observations of the dust geometry around R Coronae Borealis stars

Auteurs : S. N. Bright ; O. Chesneau ; G. C. Clayton ; O. De Marco ; I. C. Leão ; J. Nordhaus ; J. S. Gallagher

Source :

RBID : ISTEX:6F14F0071DF41EF3A6400521165917D0531384C3

English descriptors

Abstract

We are investigating the formation and evolution of dust around the hydrogen‐deficient supergiants known as R Coronae Borealis (RCB) stars. We aim to determine the connection between the probable merger past of these stars and their current dust‐production activities. We carried out high angular resolution interferometric observations of three RCB stars, namely RY Sgr, V CrA and V854 Cen, with the mid‐infrared interferometer (MIDI) on the Very Large Telescope Interferometer (VLTI), using two telescope pairs. The baselines ranged from 30 to 60 m, allowing us to probe the dusty environment at very small spatial scales (∼50 mas or 400R★). The observations of the RCB star dust environments were interpreted using both geometrical models and one‐dimensional radiative transfer codes. From our analysis, we find that asymmetric circumstellar material is apparent in RY Sgr, may also exist in V CrA and is possible for V854 Cen. Overall, we find that our observations are consistent with dust forming in clumps ejected randomly around the RCB star so that over time they create a spherically symmetric distribution of dust. However, we conclude that the determination of whether there is a preferred plane of dust ejection must wait until a time series of observations are obtained.

Url:
DOI: 10.1111/j.1365-2966.2011.18449.x

Links to Exploration step

ISTEX:6F14F0071DF41EF3A6400521165917D0531384C3

Le document en format XML

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<div type="abstract" xml:lang="en">We are investigating the formation and evolution of dust around the hydrogen‐deficient supergiants known as R Coronae Borealis (RCB) stars. We aim to determine the connection between the probable merger past of these stars and their current dust‐production activities. We carried out high angular resolution interferometric observations of three RCB stars, namely RY Sgr, V CrA and V854 Cen, with the mid‐infrared interferometer (MIDI) on the Very Large Telescope Interferometer (VLTI), using two telescope pairs. The baselines ranged from 30 to 60 m, allowing us to probe the dusty environment at very small spatial scales (∼50 mas or 400R★). The observations of the RCB star dust environments were interpreted using both geometrical models and one‐dimensional radiative transfer codes. From our analysis, we find that asymmetric circumstellar material is apparent in RY Sgr, may also exist in V CrA and is possible for V854 Cen. Overall, we find that our observations are consistent with dust forming in clumps ejected randomly around the RCB star so that over time they create a spherically symmetric distribution of dust. However, we conclude that the determination of whether there is a preferred plane of dust ejection must wait until a time series of observations are obtained.</div>
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<i>R</i>
<sub></sub>
</span>
). The observations of the RCB star dust environments were interpreted using both geometrical models and one‐dimensional radiative transfer codes.</p>
<p>From our analysis, we find that asymmetric circumstellar material is apparent in RY Sgr, may also exist in V CrA and is possible for V854 Cen. Overall, we find that our observations are consistent with dust forming in clumps ejected randomly around the RCB star so that over time they create a spherically symmetric distribution of dust. However, we conclude that the determination of whether there is a preferred plane of dust ejection must wait until a time series of observations are obtained.</p>
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<p>Based on observations made with the Very Large Telescope Interferometer at Paranal Observatory under programme 079.D‐0415.</p>
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<title>Very Large Telescope Interferometer observations of the dust geometry around R Coronae Borealis stars</title>
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<title>The dust geometry around RCB stars</title>
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<title>Very Large Telescope Interferometer observations of the dust geometry around R Coronae Borealis stars★</title>
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<name type="personal">
<namePart type="given">S. N.</namePart>
<namePart type="family">Bright</namePart>
<affiliation>Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia</affiliation>
<affiliation>E-mail: stacey.bright@mq.edu.au</affiliation>
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<name type="personal">
<namePart type="given">O.</namePart>
<namePart type="family">Chesneau</namePart>
<affiliation>UMR 6525 H. Fizeau, Univ. Nice Sophia Antipolis, CNRS, Observatoire de la Côte d’Azur, Av. Copernic, F‐06130 Grasse, France</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
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<name type="personal">
<namePart type="given">G. C.</namePart>
<namePart type="family">Clayton</namePart>
<affiliation>Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA</affiliation>
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<name type="personal">
<namePart type="given">O.</namePart>
<namePart type="family">De Marco</namePart>
<affiliation>Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia</affiliation>
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<name type="personal">
<namePart type="given">I. C.</namePart>
<namePart type="family">Leão</namePart>
<affiliation>Departamento de Física, Universidade Federal do Rio Grande do Norte, 59072‐970 Natal, RN, Brazil</affiliation>
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</role>
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<name type="personal">
<namePart type="given">J.</namePart>
<namePart type="family">Nordhaus</namePart>
<affiliation>Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA</affiliation>
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<roleTerm type="text">author</roleTerm>
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<name type="personal">
<namePart type="given">J. S.</namePart>
<namePart type="family">Gallagher</namePart>
<affiliation>Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA</affiliation>
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<dateIssued encoding="w3cdtf">2011-06-21</dateIssued>
<edition>Accepted 2011 January 31. Received 2011 January 27; in original form 2010 September 22</edition>
<copyrightDate encoding="w3cdtf">2011</copyrightDate>
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<abstract lang="en">We are investigating the formation and evolution of dust around the hydrogen‐deficient supergiants known as R Coronae Borealis (RCB) stars. We aim to determine the connection between the probable merger past of these stars and their current dust‐production activities. We carried out high angular resolution interferometric observations of three RCB stars, namely RY Sgr, V CrA and V854 Cen, with the mid‐infrared interferometer (MIDI) on the Very Large Telescope Interferometer (VLTI), using two telescope pairs. The baselines ranged from 30 to 60 m, allowing us to probe the dusty environment at very small spatial scales (∼50 mas or 400R★). The observations of the RCB star dust environments were interpreted using both geometrical models and one‐dimensional radiative transfer codes. From our analysis, we find that asymmetric circumstellar material is apparent in RY Sgr, may also exist in V CrA and is possible for V854 Cen. Overall, we find that our observations are consistent with dust forming in clumps ejected randomly around the RCB star so that over time they create a spherically symmetric distribution of dust. However, we conclude that the determination of whether there is a preferred plane of dust ejection must wait until a time series of observations are obtained.</abstract>
<note type="content">*Based on observations made with the Very Large Telescope Interferometer at Paranal Observatory under programme 079.D‐0415.</note>
<subject lang="en">
<genre>keywords</genre>
<topic>techniques: high angular resolution</topic>
<topic>techniques: interferometric</topic>
<topic>stars: individual: RY Sgr</topic>
<topic>stars: individual: V CrA</topic>
<topic>stars: individual: V854 Cen</topic>
<topic>stars: mass‐loss</topic>
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<identifier type="eISSN">1365-2966</identifier>
<identifier type="DOI">10.1111/(ISSN)1365-2966</identifier>
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<date>2011</date>
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<number>414</number>
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<accessCondition type="use and reproduction" contentType="copyright">© 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS</accessCondition>
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