Eta Carinae: an evolving view of the central binary, its interacting winds and its foreground ejecta

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dc.contributor.authorGull, Theodore R.
dc.contributor.authorHillier, D. John
dc.contributor.authorHartman, Henrik
dc.contributor.authorCorcoran, Michael F.
dc.contributor.authorDamineli, Augusto
dc.contributor.authorEspinoza-Galeas, David
dc.contributor.authorHamaguchi, Kenji
dc.contributor.authorNavarete, Felipe
dc.contributor.authorNielsen, Krister
dc.contributor.authorMadura, Thomas
dc.contributor.authorMoffat, Anthony F. J.
dc.contributor.authorMorris, Patrick
dc.contributor.authorRichardson, Noel D.
dc.contributor.authorRussell, Christopher M. P.
dc.contributor.authorStevens, Ian R.
dc.contributor.authorWeigelt, Gerd
dc.date.accessioned2022-07-12T21:33:58Z
dc.date.available2022-07-12T21:33:58Z
dc.date.issued2022-05-30
dc.description.abstractFUV spectra of Eta Car, recorded across two decades with HST/STIS, document multiple changes in resonant lines caused by dissipating extinction in our line of sight. The FUV flux has increased nearly ten-fold which has led to increased ionization of the multiple shells within the Homunculus and photo-destruction of molecular hydrogen. Comparison of observed resonant line profiles with CMFGEN model profiles allows separation of wind-wind collision and shell absorptions from the primary wind, P Cygni profiles.The dissipating occulter preferentially obscured the central binary and interacting winds relative to the very extended primary wind. We are now able to monitor changes in the colliding winds with orbital phase. High velocity transient absorptions occurred across the most recent periastron passage, indicating acceleration of the primary wind by the secondary wind which leads to a downstream, high velocity bowshock that is newly generated every orbital period. There is no evidence of changes in the properties of the binary winds.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 acknowledges FAPESP for support through process 2011/51680- 6. AJFM is grateful for financial aid from NSERC (Canada). The work of FN is supported by NOIRLab, which is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. CMPR acknowledges support from the National Science Foundation under Grant No. AST 1747658. TRG received no direct support for this study. We thank the referee for the careful and very prompt review of this lengthy study.en_US
dc.description.urihttps://arxiv.org/abs/2205.15116en_US
dc.format.extent36 pagesen_US
dc.genrejournal articlesen_US
dc.genrepreprintsen_US
dc.identifierdoi:10.13016/m2xbzm-prkt
dc.identifier.urihttps://doi.org/10.48550/arXiv.2205.15116
dc.identifier.urihttp://hdl.handle.net/11603/25147
dc.language.isoen_USen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
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: an evolving view of the central binary, its interacting winds and its foreground ejectaen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0001-7515-2779en_US

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