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    A moderately precise dynamical age for the Homunculus of Eta Carinae based on 13 years of HST imaging

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    Author
    Smith, Nathan
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-11
    Keywords
    circumstellar matter
    stars: evolution
    stars: winds, outflows
    
    Metadata
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    Publisher
    OXFORD UNIV PRESS
    Citation
    A moderately precise dynamical age for the Homunculus of Eta Carinae based on 13 years of HST imaging 2017, 471 (4):4465 Monthly Notices of the Royal Astronomical Society
    Journal
    Monthly Notices of the Royal Astronomical Society
    Rights
    © 2017 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The Hubble Space Telescope archive contains a large collection of images of eta Carinae, and this paper analyses those most suitable for measuring its expanding Homunculus Nebula. Multiple intensity tracings through the Homunculus reveal the fractional increase in the overall size of the nebula; this avoids registration uncertainty, mitigates brightness fluctuations, and is independent of previous methods. Combining a 13 yr baseline ofWide Field Planetary Camera 2 images in the F631N filter, with a 4 yr baseline of Advanced Camera for Surveys/ High Resolution Channel images in the F550M filter, yields an ejection date (assuming linear motion) of 1847.1 (+/- 0.8 yr). This result improves the precision, but is in excellent agreement with the previous study by Morse et al., that used a shorter time baseline and a different analysis method. This more precise date is inconsistent with ejection during a periastron passage of the eccentric binary. Ejection occurred well into the main plateau of the Great Eruption, and not during the brief peaks in 1843 and 1838. The age uncertainty is dominated by a real spread in ages of various knots, and by some irregular brightness fluctuations. Several knots appear to have been ejected decades before or after the mean date, implying a complicated history of mass-loss episodes outside the main bright phase of the eruption. The extended history of mass ejection may have been largely erased by the passage of a shock through clumpy ejecta, as most material was swept into a thin shell with nearly uniform apparent age.
    ISSN
    0035-8711
    1365-2966
    DOI
    10.1093/mnras/stx1868
    Version
    Final published version
    Sponsors
    NASA from the Space Telescope Science Institute [AR-12618, AR-14586, GO-13390]; NASA [NAS5-26555]; NSF [AST-1312221]
    Additional Links
    http://academic.oup.com/mnras/article/471/4/4465/4004759/A-moderately-precise-dynamical-age-for-the
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stx1868
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