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Article: Circumstellar CO J = 3→2 detected around the evolving metal-poor ([Fe/H]≈−1.15 dex) AGB star RU Vulpeculae

TitleCircumstellar CO J = 3→2 detected around the evolving metal-poor ([Fe/H]≈−1.15 dex) AGB star RU Vulpeculae
Authors
Keywordsstars: AGB and post-AGB
circumstellar matter
stars: mass-loss
stars: winds
outflows
Issue Date2020
PublisherOxford 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, 2020, v. 491 n. 1, p. 1174-1189 How to Cite?
AbstractWe report the first detection of CO J = 3→2 around a truly metal-poor evolved star. RU Vulpeculae is modelled to have Teff ≈ 3620 K, L ≈ 3128 ± 516 L⊙, log(g) = 0.0 ± 0.2 dex and [Fe/H] = −1.3 to −1.0 dex, and is modelled to have recently undergone a thermal pulse. Its infrared flux has approximately doubled over 35 yr. ALMA observations show the 3→2 line is narrow (half-width ∼1.8–3.5 km s−1). The 2→1 line is much weaker: it is not confidently detected. Spectral-energy-distribution fitting indicates very little circumstellar absorption, despite its substantial mid-infrared emission. A VISIR mid-infrared spectrum shows features typical of previously observed metal-poor stars, dominated by a substantial infrared excess but with weak silicate and (possibly) Al2O3 emission. A lack of resolved emission, combined with weak 2→1 emission, indicates the dense circumstellar material is truncated at large radii. We suggest that rapid dust condensation is occurring, but with an aspherical geometry (e.g. a disc or clumps) that does not obscure the star. We compare with T UMi, a similar star which is currently losing its dust.
Persistent Identifierhttp://hdl.handle.net/10722/281241
ISSN
2023 Impact Factor: 4.7
2023 SCImago Journal Rankings: 1.621
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorMcDonald, I-
dc.contributor.authorUttenthaler, S-
dc.contributor.authorZijlstra, AA-
dc.contributor.authorRichards, AMS-
dc.contributor.authorLagadec, E-
dc.date.accessioned2020-03-09T09:52:01Z-
dc.date.available2020-03-09T09:52:01Z-
dc.date.issued2020-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2020, v. 491 n. 1, p. 1174-1189-
dc.identifier.issn0035-8711-
dc.identifier.urihttp://hdl.handle.net/10722/281241-
dc.description.abstractWe report the first detection of CO J = 3→2 around a truly metal-poor evolved star. RU Vulpeculae is modelled to have Teff ≈ 3620 K, L ≈ 3128 ± 516 L⊙, log(g) = 0.0 ± 0.2 dex and [Fe/H] = −1.3 to −1.0 dex, and is modelled to have recently undergone a thermal pulse. Its infrared flux has approximately doubled over 35 yr. ALMA observations show the 3→2 line is narrow (half-width ∼1.8–3.5 km s−1). The 2→1 line is much weaker: it is not confidently detected. Spectral-energy-distribution fitting indicates very little circumstellar absorption, despite its substantial mid-infrared emission. A VISIR mid-infrared spectrum shows features typical of previously observed metal-poor stars, dominated by a substantial infrared excess but with weak silicate and (possibly) Al2O3 emission. A lack of resolved emission, combined with weak 2→1 emission, indicates the dense circumstellar material is truncated at large radii. We suggest that rapid dust condensation is occurring, but with an aspherical geometry (e.g. a disc or clumps) that does not obscure the star. We compare with T UMi, a similar star which is currently losing its dust.-
dc.languageeng-
dc.publisherOxford 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.ispartofMonthly Notices of the Royal Astronomical Society-
dc.rightsMonthly Notices of the Royal Astronomical Society. Copyright © Oxford University press, co-published with Royal Astronomical Society.-
dc.rightsThis article has been accepted for publication in [Journal Title] ©: [2020] [I McDonald, S Uttenthaler, A A Zijlstra, A M S Richards, E Lagadec] Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.-
dc.subjectstars: AGB and post-AGB-
dc.subjectcircumstellar matter-
dc.subjectstars: mass-loss-
dc.subjectstars: winds-
dc.subjectoutflows-
dc.titleCircumstellar CO J = 3→2 detected around the evolving metal-poor ([Fe/H]≈−1.15 dex) AGB star RU Vulpeculae-
dc.typeArticle-
dc.identifier.emailZijlstra, AA: zijlstra@hku.hk-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1093/mnras/stz3009-
dc.identifier.scopuseid_2-s2.0-85077333148-
dc.identifier.hkuros309261-
dc.identifier.volume491-
dc.identifier.issue1-
dc.identifier.spage1174-
dc.identifier.epage1189-
dc.identifier.isiWOS:000512163600080-
dc.publisher.placeUnited Kingdom-
dc.identifier.issnl0035-8711-

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