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Physics of the Inner Ejecta

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Eta Carinae and the Supernova Impostors

Part of the book series: Astrophysics and Space Science Library ((ASSL,volume 384))

Abstract

Eta Carinae’s inner ejecta are dominated observationally by the bright Weigelt blobs and their famously rich spectra of nebular emission and absorption lines. They are dense (n e ∼ 107–108 cm− 3), warm (T e ∼ 6,000–7,000 K) and slow moving ( ∼ 40 km s− 1) condensations of mostly neutral (H0) gas. Located within 1,000 AU of the central star, they contain heavily CNO-processed material that was ejected from the star about a century ago. Outside the blobs, the inner ejecta include absorption-line clouds with similar conditions, plus emission-line gas that has generally lower densities and a wider range of speeds (reaching a few hundred km s− 1) compared to the blobs. The blobs appear to contain a negligible amount of dust and have a nearly dust-free view of the central source, but our view across the inner ejecta is severely affected by uncertain amounts of dust having a patchy distribution in the foreground. Emission lines from the inner ejecta are powered by photoionization and fluorescent processes. The variable nature of this emission, occurring in a 5.54years “event” cycle, requires specific changes to the incident flux that hold important clues to the nature of the central object.

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Acknowledgements

FH grateful to the HST–Eta Carinae Treasury Team, especially Kris Davidson and Bish Ishibashi, for their help and guidance with the HST spectra. Brian Cherinka also helped with some of the data processing. FH had valuable discussions about nebular physics with Gary Ferland and Pat Hall. Andrea Mehner contributed recent information, especially for Sect. 5.4.1. Finally, I thank the editors Roberta Humphreys and Kris Davidson for useful comments.

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  1. Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL, 32611-2055, USA

    Fred Hamann

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  1. Fred Hamann
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Correspondence to Fred Hamann .

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  1. Dept. Astronomy, University of Minnesota, Church Street SE., 116, Minneapolis, 55455, Minnesota, USA

    Kris Davidson

  2. Dept. Astronomy, University of Minnesota, Church Street SE., 116, Minneapolis, 55455, Minnesota, USA

    Roberta M. Humphreys

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© 2012 Springer Science+Business Media, LLC

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Hamann, F. (2012). Physics of the Inner Ejecta. In: Davidson, K., Humphreys, R. (eds) Eta Carinae and the Supernova Impostors. Astrophysics and Space Science Library, vol 384. Springer, Boston, MA. https://doi.org/10.1007/978-1-4614-2275-4_5

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  • DOI: https://doi.org/10.1007/978-1-4614-2275-4_5

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