LOCATING THE ACCRETION FOOTPRINT ON A HERBIG Ae STAR: MWC 480

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dc.contributor.authorGrady, C. A.
dc.contributor.authorHamaguchi, K.
dc.contributor.authorSchneider, G.
dc.contributor.authorStecklum, B.
dc.contributor.authorWoodgate, B. E.
dc.contributor.authorMcCleary, J. E.
dc.contributor.authorWilliger, G. M.
dc.contributor.authorSitko, M. L.
dc.contributor.authorMenard, F.
dc.contributor.authorHenning, Th
dc.contributor.authorBrittain, S.
dc.contributor.authorTroutmann, M.
dc.contributor.authorDonehew, B.
dc.contributor.authorHines, D.
dc.contributor.authorWisniewski, J. P.
dc.contributor.authorLynch, D. K.
dc.contributor.authorRussell, R. W.
dc.contributor.authorRudy, R. J.
dc.contributor.authorDay, A. N.
dc.contributor.authorShenoy, A.
dc.contributor.authorWilner, D.
dc.contributor.authorSilverstone, M.
dc.contributor.authorBouret, J. -C.
dc.contributor.authorMeusinger, H.
dc.contributor.authorClampin, M.
dc.contributor.authorKim, S.
dc.contributor.authorPetre, R.
dc.contributor.authorSahu, M.
dc.contributor.authorEndres, M.
dc.contributor.authorCollins, K. A.
dc.contributor.otherEureka Scientific
dc.contributor.otherNational Aeronautics & Space Administration (NASA)
dc.contributor.otherNASA Goddard Space Flight Center
dc.contributor.otherUniversity System of Maryland
dc.contributor.otherUniversity of Maryland Baltimore
dc.contributor.otherUniversity of Arizona
dc.contributor.otherNew Mexico State University
dc.contributor.otherUniversity of Louisville
dc.contributor.otherJohns Hopkins University
dc.contributor.otherUDICE-French Research Universities
dc.contributor.otherUniversite Cote d'Azur
dc.contributor.otherObservatoire de la Cote d'Azur
dc.contributor.otherUniversity System of Ohio
dc.contributor.otherUniversity of Cincinnati
dc.contributor.otherCentre National de la Recherche Scientifique (CNRS)
dc.contributor.otherCommunaute Universite Grenoble Alpes
dc.contributor.otherUniversite Grenoble Alpes (UGA)
dc.contributor.otherMax Planck Society
dc.contributor.otherClemson University
dc.contributor.otherUniversity of Washington
dc.contributor.otherUniversity of Washington Seattle
dc.contributor.otherAerospace Corporation - USA
dc.contributor.otherHarvard University
dc.contributor.otherSmithsonian Astrophysical Observatory
dc.contributor.otherSmithsonian Institution
dc.contributor.otherAix-Marseille Universite
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2019-06-11T19:52:56Z
dc.date.available2019-06-11T19:52:56Z
dc.date.copyright2010
dc.date.issued2010-08-20
dc.description.abstractAccretion is a fundamental process which establishes the dynamics of the protoplanetary disk and the final properties of the forming star. In solar-type stars, the star-disk coupling is determined by the magnetic field structure, which is responsible for funneling material from the disk midplane to higher latitudes on the star. Here, we use pan-chromatic data for the Herbig Ae star MWC 480 to address whether similar processes occur in intermediate-mass stars. MWC 480 has X-ray emission typical of actively accreting Herbig Ae stars, but with similar to 10x more photoelectric absorption than expected from optical and FUV data. We consider three sources for the absorption: the disk, absorption in a wind or jet, and accretion. While we detect the disk in scattered light in a re-analysis of archival Hubble Space Telescope data, the data are consistent with grazing illumination of the dust disk. We find that MWC 480's disk is stratified, geometrically thin, and is not responsible for the observed photoelectric absorption. MWC 480 drives a bipolar jet, but with a mass-loss rate that is low compared to other Herbig Ae stars, where the outflow is more favorably oriented and enhanced photoelectric absorption is not seen. This excludes a jet or wind origin for the enhanced photoelectric absorption. We compare MWC 480's OVI emission with other Herbig Ae stars. The distribution of the emission in inclination, and lack of a correlation of profile shape and system inclination excludes equatorially confined accretion for the FUSE Herbig Ae stars. The photoelectric absorption data further suggest that the accretion footprint on MWC 480 and other Herbig Ae stars is located at high-temperate, rather than polar, latitudes. These findings support the presence of funneled accretion in MWC 480 and Herbig Ae stars, strengthening the parallel to T Tauri stars.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationGrady, C.A., et al. (2010): Locating the Accretion Footprint on a Herbig Ae Star: MWC 480. The Astronomical Journal, 719(2). DOI: http://dx.doi.org/10.1088/0004-637X/719/2/1565
dc.identifier.doi10.1088/0004-637X/719/2/1565
dc.identifier.orcidhttps://orcid.org/0000-0001-5638-1330
dc.identifier.orcidhttps://orcid.org/0000-0002-1493-300X
dc.identifier.orcidhttps://orcid.org/0000-0002-9883-7460
dc.identifier.orcidhttps://orcid.org/0000-0003-1526-7587
dc.identifier.urihttp://ir.ua.edu/handle/123456789/5721
dc.languageEnglish
dc.language.isoen_US
dc.publisherIOP Publishing
dc.rights.holderAmerican Astronomical Society
dc.subjectISM: jets and outflows
dc.subjectprotoplanetary disks
dc.subjectstars: individual (MWC 480)
dc.subjectultraviolet: stars
dc.subjectX-rays: stars
dc.subjectX-RAY-EMISSION
dc.subjectPRE-MAIN-SEQUENCE
dc.subject2-DIMENSIONAL RADIATIVE-TRANSFER
dc.subjectINFRARED FILTER SET
dc.subjectT-TAURI STARS
dc.subjectYOUNG STELLAR OBJECTS
dc.subjectPROTOSTELLAR ENVELOPES
dc.subjectDISK ACCRETION
dc.subjectAE/BE STARS
dc.subjectCIRCUMSTELLAR ENVIRONMENT
dc.subjectAstronomy & Astrophysics
dc.titleLOCATING THE ACCRETION FOOTPRINT ON A HERBIG Ae STAR: MWC 480en_US
dc.typetext
dc.typeArticle

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