The Spitzer IRS view of V4334 Sgr (Sakurai's Object)

Details The Spitzer IRS view of V4334 Sgr (Sakurai's Object) The Spitzer IRS view of V4334 Sgr (Sakurai's Object)

2006-09-04

arxiv.org/abs/astro-ph/0609083v1

Mon.Not.Roy.Astron.Soc.373:L75-L79,2006

Astronomy and Astrophysics

Astrophysics

5 pages, 6 figures. Accepted for publication in MNRAS

Scientific paper

10.1111/j.1745-3933.2006.00246.x

We present an observation of the very late thermal pulse object V4334 Sgr (Sakurai's Object) with the Infrared Spectrometer (IRS) on the Spitzer Space Telescope. The emission from 5-38 microns is dominated by the still-cooling dust shell. A number of features are seen in absorption against the dust shell, which we attribute to HCN and polyyne molecules. We use these features to determine the 12C/13C ratio for the absorbing gas to be ~ 3.2 (+3.2,-1.6}; this implies that, despite the H-content of the molecules, the hydrocarbon-bearing gas must have originated in material produced in the very late thermal pulse. We see no evidence of emission lines, despite the recently-reported optical and radio observations that suggest the effective temperature of the stellar remnant is rising.

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