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Eta Carinae: An Evolving View of the Central Binary, Its Interacting Winds and Its Foreground Ejecta

Gull, Theodore R. and Hillier, D. John and Hartman, Henrik and Corcoran, Michael F. and Damineli, Augusto and Espinoza-Galeas, David and Hamaguchi, Kenji and Navarete, Felipe and Nielsen, Krister and Madura, Thomas and Moffat, Anthony F. J. and Morris, Patrick and Richardson, Noel D. and Russell, Christopher M. P. and Stevens, Ian R. and Weigelt, Gerd (2022) Eta Carinae: An Evolving View of the Central Binary, Its Interacting Winds and Its Foreground Ejecta. Astrophysical Journal, 933 (2). Art. No. 175. ISSN 0004-637X. doi:10.3847/1538-4357/ac74c2.

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FUV spectra of η 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 tenfold, which has led to increased ionization of the multiple shells within the Homunculus and photodestruction of H₂. 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 bow shock that is newly generated every orbital period. There is no evidence of changes in the properties of the binary winds.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Gull, Theodore R.0000-0002-6851-5380
Hillier, D. John0000-0001-5094-8017
Hartman, Henrik0000-0001-9853-2555
Corcoran, Michael F.0000-0002-7762-3172
Damineli, Augusto0000-0002-7978-2994
Espinoza-Galeas, David0000-0003-2971-0439
Hamaguchi, Kenji0000-0001-7515-2779
Navarete, Felipe0000-0002-0284-0578
Nielsen, Krister0000-0003-2636-7663
Madura, Thomas0000-0001-7697-2955
Moffat, Anthony F. J.0000-0002-4333-9755
Morris, Patrick0000-0002-5186-4381
Richardson, Noel D.0000-0002-2806-9339
Russell, Christopher M. P.0000-0002-9213-0763
Stevens, Ian R.0000-0001-7673-4340
Weigelt, Gerd0000-0001-9754-2233
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2022 April 14; revised 2022 May 16; accepted 2022 May 29; published 2022 July 13. N.R. acknowledges funding from HST programs 15611 and 15992, which were accepted as supplementary observations associated with CHANDRA programs 20200564 and 21200197. M.F.C. is supported under the CRESST-II cooperative agreement #80GSFC17M0002 with the NASA/Goddard Space Flight Center. A.D. acknowledges FAPESP for support through process 2011/51680-6. A.J.F.M. is grateful for financial aid from NSERC (Canada). The work of F.N. 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. C.M.P.R. acknowledges support from the National Science Foundation under grant No. AST-1747658. T.R.G. received no direct support for this study. We thank the referee for the careful and very prompt review of this lengthy study. Facility: HST(STIS). Software: CMFGEN (Hillier & Lanz 2001; Hillier 2011).
Funding AgencyGrant Number
NASA Hubble FellowshipGO-15992
Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)2011/51680-6
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Subject Keywords:Massive stars; Stellar winds
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Massive stars (732); Stellar winds (1636)
Record Number:CaltechAUTHORS:20220722-769177000
Persistent URL:
Official Citation:Theodore R. Gull et al 2022 ApJ 933 175
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115786
Deposited By: George Porter
Deposited On:25 Jul 2022 21:17
Last Modified:25 Jul 2022 21:17

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