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Article: The radio source around η Carinae

TitleThe radio source around η Carinae
Authors
KeywordsCircumstellar Matter
Radio Continuum: Stars
Stars: Individual (Η Carinae)
Supergiants
Issue Date1994
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 1994, v. 429 n. 1, p. 380-384 How to Cite?
AbstractWe present high spatial resolution radio observations of the peculiar southern star η Carinae, made with the Australia Telescope. The images, at 8 and 9 GHz with a resolution of 1″.0, show a source of dimension 10″ and total flux of 0.7 Jy dominated by a strong central peak. The radio emission is unpolarized and offers no support to models which invoke degenerate stars or more exotic objects within the core of η Car. In these data we find no evidence for more than one energy source in the core with arcsecond separations as some infrared observations have suggested. Several levels of structure are evident in the radio image, which shows symmetry on the larger scales. Conventional formulae for stellar wind radio sources give a mass loss rate of order 3 × 10 -4 M ⊙ yr -1 based on the radio flux in the central peak, which yields a wind momentum flux of order 20% of the momentum flux available from the star's radiation field. The radio emission at these frequencies is consistent with thermal emission from gas flowing away from a "luminous blue variable" star (LBV). η Car is probably the brightest thermal stellar wind radio source in the sky.
Persistent Identifierhttp://hdl.handle.net/10722/174908
ISSN
2015 Impact Factor: 5.487
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DC FieldValueLanguage
dc.contributor.authorWhite, SMen_US
dc.contributor.authorDuncan, RAen_US
dc.contributor.authorLim, Jen_US
dc.contributor.authorNelson, GJen_US
dc.contributor.authorDrake, SAen_US
dc.contributor.authorKundu, MRen_US
dc.date.accessioned2012-11-26T08:48:04Z-
dc.date.available2012-11-26T08:48:04Z-
dc.date.issued1994en_US
dc.identifier.citationAstrophysical Journal Letters, 1994, v. 429 n. 1, p. 380-384en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/174908-
dc.description.abstractWe present high spatial resolution radio observations of the peculiar southern star η Carinae, made with the Australia Telescope. The images, at 8 and 9 GHz with a resolution of 1″.0, show a source of dimension 10″ and total flux of 0.7 Jy dominated by a strong central peak. The radio emission is unpolarized and offers no support to models which invoke degenerate stars or more exotic objects within the core of η Car. In these data we find no evidence for more than one energy source in the core with arcsecond separations as some infrared observations have suggested. Several levels of structure are evident in the radio image, which shows symmetry on the larger scales. Conventional formulae for stellar wind radio sources give a mass loss rate of order 3 × 10 -4 M ⊙ yr -1 based on the radio flux in the central peak, which yields a wind momentum flux of order 20% of the momentum flux available from the star's radiation field. The radio emission at these frequencies is consistent with thermal emission from gas flowing away from a "luminous blue variable" star (LBV). η Car is probably the brightest thermal stellar wind radio source in the sky.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.subjectCircumstellar Matteren_US
dc.subjectRadio Continuum: Starsen_US
dc.subjectStars: Individual (Η Carinae)en_US
dc.subjectSupergiantsen_US
dc.titleThe radio source around η Carinaeen_US
dc.typeArticleen_US
dc.identifier.emailLim, J: jjlim@hku.hken_US
dc.identifier.authorityLim, J=rp00745en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-12044251898en_US
dc.identifier.volume429en_US
dc.identifier.issue1en_US
dc.identifier.spage380en_US
dc.identifier.epage384en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridWhite, SM=7404079906en_US
dc.identifier.scopusauthoridDuncan, RA=7401604768en_US
dc.identifier.scopusauthoridLim, J=7403453870en_US
dc.identifier.scopusauthoridNelson, GJ=16459833800en_US
dc.identifier.scopusauthoridDrake, SA=7102438520en_US
dc.identifier.scopusauthoridKundu, MR=7102095820en_US

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