Evans, A, Banerjee, DPK, Geballe, TR, Gehrz, RD, Woodward, CE, Hinkle, K, Joyce, RR and Shahbandeh, M (2022) V4334 Sgr (Sakurai's Object): still churning out the dust. Monthly Notices of the Royal Astronomical Society, 511 (1). pp. 713-722. ISSN 0035-8711

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We present a 0.8–2.5 µm spectrum of the Very Late Thermal Pulse object V4334 Sgr (Sakurai’s Object), obtained in 2020 September. The spectrum displays a continuum that rises strongly to longer wavelengths, and is considerably brighter than the most recent published spectrum obtained seven years earlier. At the longer wavelengths the continuum is well fitted by a blackbody with a temperature of 624±8 K. However, there is excess continuum at the shortest wavelengths that we interpret as being due to hot dust that has very recently formed in an environment with C/O ≃ 2.5. Other possible sources for this excess continuum are discussed – such as the stellar photosphere dimly seen through the dust shell, and light scattered off the inner wall of the dust torus – but these interpretations seem unlikely. Numerous emission lines are present, including those of He i, C i, [C i], and O i. Our observations confirm that emission in the He i 1.083 µm and [C i] 0.9827/0.9852 µm lines is spatially extended. The [C i] line fluxes suggest that the electron density increased by an order of magnitude between 2013 and 2020, and that these two lines may soon disappear from the spectrum. The flux ratio of the 1.083 µm and 2.058 µm He i lines is consistent with the previously-assumed interstellar extinction. The stellar photosphere remains elusive, and the central star may not be as hot as suggested by current evolutionary models.

Item Type: Article
Additional Information: The final version of this article and all relevant information related to it, including copyrights, can be found on the publisher website.
Uncontrolled Keywords: stars: AGB and post-AGB, stars: carbon, circumstellar matter, stars: evolution, stars: individual: V4334 Sgr (Sakurai’s Object), infrared: stars
Subjects: Q Science > Q Science (General)
Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 12 Jan 2022 16:31
Last Modified: 07 Jun 2022 13:49
URI: https://eprints.keele.ac.uk/id/eprint/10495

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