The continuing saga of Sakurai's object (V4334 Sgr): dust production and helium line emission

Details The continuing saga of Sakurai's object (V4334 Sgr): dust production and helium line emission The continuing saga of Sakurai's object (V4334 Sgr): dust production and helium line emission

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.315..595t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 315, Issue 3, pp. 595-599.

Astronomy and Astrophysics

Astronomy

15

Stars: Agb And Post-Agb, Circumstellar Matter, Stars: Individual: Sakurai'S Object, Stars: Individual: V4334 Sgr, Infrared: Stars

Scientific paper

We report further UKIRT spectroscopic observations of Sakurai's object (V4334 Sgr) made in 1999 April/May in the 1-4.75μm range, and find that the emission is dominated by amorphous carbon at Td~600K. The estimated maximum grain size is 0.6μm, and the mass lower limit is 1.7+/-0.2×10-8Msolar to 8.9+/-0.6×10-7Msolar for distances of 1.1-8kpc. For 3.8kpc the mass is 2.0+/-0.1×10-7Msolar. We also report strong Hei emission at 1.083μm, in contrast to the strong absorption in this line in 1998. We conclude that the excitation is collisional, and is probably caused by a wind, consistent with the P Cygni profile observed by Eyres et al. in 1998.

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