The Luminous Blue Variable RMC 127 as Seen with ALMA and ATCA

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dc.contributor.authorAgliozzo, C.
dc.contributor.authorTrigilio, C.
dc.contributor.authorPignata, G.
dc.contributor.authorPhillips, N.M.
dc.contributor.authorNikutta, R.
dc.contributor.authorLeto, P.
dc.contributor.authorUmana, G.
dc.contributor.authorIngallinera, A.
dc.contributor.authorBuemi, C.
dc.contributor.authorBauer, F.E.
dc.contributor.authorPaladini, R.
dc.contributor.authorNoriega-Crespo, A.
dc.contributor.authorPrieto, J.L.
dc.contributor.authorMassardi, M.
dc.contributor.authorCerrigone, L.
dc.date.accessioned2017-11-24T18:49:11Z
dc.date.available2017-11-24T18:49:11Z
dc.date.issued2017-06
dc.descriptionIndexación: Web of Science; Scopus.es_CL
dc.description.abstractWe present ALMA and ATCA observations of the luminous blue variable RMC 127. The radio maps show for the first time the core of the nebula and evidence that the nebula is strongly asymmetric with a Z-pattern shape. Hints of this morphology are also visible in the archival Hubble Space Telescope image, which overall resembles the radio emission. The emission mechanism in the outer nebula is optically thin free-free in the radio. At high frequencies, a component of point-source emission appears at the position of the star, up to the ALMA frequencies. The rising flux density distribution () of this object suggests thermal emission from the ionized stellar wind and indicates a departure from spherical symmetry with. We examine different scenarios to explain this excess of thermal emission from the wind and show that this can arise from a bipolar outflow, supporting the suggestion by other authors that the stellar wind of RMC 127 is aspherical. We fit the data with two collimated ionized wind models, and we find that the mass-loss rate can be a factor of two or more smaller than in the spherical case. We also fit the photometry obtained by IR space telescopes and deduce that the mid-to far-IR emission must arise from extended, cool () dust within the outer ionized nebula. Finally, we discuss two possible scenarios for the nebular morphology: the canonical single-star expanding shell geometry and a precessing jet model assuming the presence of a companion star. © 2017. The American Astronomical Society.es_CL
dc.description.urihttp://iopscience.iop.org/article/10.3847/1538-4357/aa72a1/meta
dc.identifier.citationAstrophysical Journal. Volume 841, Issue 2, 1 June 2017, Article number 130es_CL
dc.identifier.issn0004-637X
dc.identifier.otherDOI: 10.3847/1538-4357/aa72a1
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/4739
dc.language.isoenes_CL
dc.publisherInstitute of Physics Publishinges_CL
dc.subjectStars: individual (RMC 127)es_CL
dc.subjectStars: mass-loss starses_CL
dc.subjectMassive stars: rotationes_CL
dc.subjectStars: winds outflowses_CL
dc.subjectSubmillimeter: starses_CL
dc.titleThe Luminous Blue Variable RMC 127 as Seen with ALMA and ATCAes_CL
dc.typeArtículoes_CL
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