Eta Carinae: the dissipating occulter is an extended structure

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dc.contributor.authorGull, Theodore R.
dc.contributor.authorHartman, Henrik
dc.contributor.authorTeodoro, Mairan
dc.contributor.authorHillier, D. John
dc.contributor.authorCorcoran, Michael F.
dc.contributor.authorDamineli, Augusto
dc.contributor.authorHamaguchi, Kenji
dc.contributor.authorMadura, Thomas
dc.contributor.authorMoffat, Anthony F. J.
dc.contributor.authorMorris, Patrick
dc.contributor.authorRichardson, Noel D.
dc.contributor.authorStevens, Ian R.
dc.contributor.authorWeigelt, Gerd
dc.date.accessioned2023-06-27T20:36:44Z
dc.date.available2023-06-27T20:36:44Z
dc.date.issued2023-05-22
dc.description.abstractPrevious STIS long-slit observations of Eta Carinae identified numerous absorption features in both the stellar spectrum, and in the adjacent nebular spectra, along our line-of-sight. The absorption features became temporarily stronger when the ionizing FUV radiation field was reduced by the periastron passage of the secondary star. Subsequently, dissipation of a dusty structure in our LOS has led to a long-term increase in the apparent magnitude of \ec, an increase in the ionizing UV radiation, and the disappearance of absorptions from multiple velocity-separated shells extending across the foreground Homunculus lobe. We use HST/STIS spectro-images, coupled with published infrared and radio observations, to locate this intervening dusty structure. Velocity and spatial information indicate the occulter is ~1000 au in front of Eta Carinae. The Homunculus is a transient structure composed of dusty, partially-ionized ejecta that eventually will disappear due to the relentless rain of ionizing radiation and wind from the current binary system along with dissipation and mixing with the ISM. This evolving complex continues to provide an astrophysical laboratory that changes on human timescales.en_US
dc.description.sponsorshipNR acknowledges funding from HST programs 15611 and 15992 which were accepted as supplementary observations associated with CHANDRA programs 20200564 and 21200197. MFC is supported under the CRESSTII cooperative agreement #80GSFC17M0002 with the NASA/Goddard Space Flight Center. AD received funding from FAPESP 2011/51680-6 and and CNPq 301490/2019-8. AFJM is grateful for financial aid from NSERC (Canada).en_US
dc.description.urihttps://arxiv.org/abs/2305.13216en_US
dc.format.extent20 pagesen_US
dc.genrejournal articlesen_US
dc.genrepreprintsen_US
dc.identifierdoi:10.13016/m2yyaa-ycuh
dc.identifier.urihttps://doi.org/10.48550/arXiv.2305.13216
dc.identifier.urihttp://hdl.handle.net/11603/28266
dc.language.isoen_USen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.en_US
dc.titleEta Carinae: the dissipating occulter is an extended structureen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0001-7515-2779en_US

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