Journal Article

Sakurai's Object: characterizing the near-infrared CO ejecta between 2003 and 2007

H. L. Worters, M. T. Rushton, S. P. S. Eyres, T. R. Geballe and A. Evans

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 393, issue 1, pages 108-112
Published in print February 2009 | ISSN: 0035-8711
Published online January 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14135.x
Sakurai's Object: characterizing the near-infrared CO ejecta between 2003 and 2007

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We present observations of Sakurai's Object obtained at 1–5 μm between 2003 and 2007. By fitting a radiative transfer model to an echelle spectrum of CO fundamental absorption features around 4.7 μm, we determine the excitation conditions in the line-forming region. We find 12C/13C = 3.5+2.0−1.5, consistent with CO originating in ejecta processed by the very late thermal pulse, rather than in the pre-existing planetary nebula. We demonstrate the existence of 2.2 × 10−6MCO≤ 2.7 × 10−6 M of CO ejecta outside the dust, forming a high-velocity wind of 500 ± 80 km s−1. We find evidence for significant weakening of the CO band and cooling of the dust around the central star between 2003 and 2005. The gas and dust temperatures are implausibly high for stellar radiation to be the sole contributor.

Keywords: stars: abundances; stars: AGB and post-AGB; circumstellar matter; stars: individual: V4334 Sgr; stars: individual: Sakurai's Object; stars: winds, outflows

Journal Article.  3898 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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