Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.393..108w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 393, Issue 1, pp. 108-112.
Astronomy and Astrophysics
Astronomy
Stars: Abundances, Stars: Agb And Post-Agb, Circumstellar Matter, Stars: Individual: V4334 Sgr, Stars: Individual: Sakurai'S Object, Stars: Winds, Outflows
Scientific paper
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 4.7μm, 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 × 10-6 <= MCO <= 2.7 × 10-6Msolar 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.
Evans Aaron
Eyres Stewart P. S.
Geballe Thomas Ronald
Rushton Mark. T.
Worters Hannah L.
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