Infrared spectroscopy of Sakurai's object |
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| Authors: | S P S Eyres A Evans T R Geballe A Salama & B Smalley |
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| Institution: | Department of Physics, Keele University, Keele, Staffordshire ST5 5BG,;Joint Astronomy Centre, 660 N. Aohoku Place, University Park, Hilo, HI 96720, USA,;ISO Science Operations Centre, ESA Astrophysics Division, PO Box 50727, E-28080 Madrid, Spain |
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| Abstract: | We present near (ground-based) and far ( ISO ) infrared spectroscopy of Sakurai's object. As in the case of the optical spectrum, between 1996 and 1997 April the near-infrared spectrum underwent a dramatic change to later spectral type, and there is some evidence that the spectrum continued to evolve during 1997. Molecular features of carbon-bearing molecules (CN, C2, CO) — corresponding to those seen in cool carbon stars — are now prominent in the 1–2.5 μ m range, and the 12C/13C ratio is low. The ISO data demonstrate the presence of hot circumstellar dust at a temperature of ～ 680 K. If the dust shell is optically thin, the dust mass is ～ 2.8 × 10?8 M⊙. |
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| Keywords: | circumstellar matter stars: evolution stars: individual: Sakurai's object (V4334 Sgr) ISM: molecules |
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