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

A. Evans, V. H. Tyne, J. T. van Loon, B. Smalley, T. R. Geballe, R. D. Gehrz, C. E. Woodward, A. A. Zijlstra, E. Polomski, M. T. Rushton, S. P S Eyres, Sumner Starrfield, J. Krautter, R. M. Wagner

Research output: Contribution to journalLetter

20 Scopus citations

Abstract

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 μm 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.

Original languageEnglish (US)
Pages (from-to)L75-L79
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume373
Issue number1
DOIs
StatePublished - Nov 2006

Keywords

  • Circumstellar matter
  • Stars: carbon
  • Stars: evolution
  • Stars: individual: V4334 Sgr
  • Stars: individual: sakurai's object
  • Stars: mass-loss

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Evans, A., Tyne, V. H., van Loon, J. T., Smalley, B., Geballe, T. R., Gehrz, R. D., Woodward, C. E., Zijlstra, A. A., Polomski, E., Rushton, M. T., Eyres, S. P. S., Starrfield, S., Krautter, J., & Wagner, R. M. (2006). The Spitzer Infrared Spectrometer view of V4334 Sgr (Sakurai's Object). Monthly Notices of the Royal Astronomical Society: Letters, 373(1), L75-L79. https://doi.org/10.1111/j.1745-3933.2006.00246.x