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000002717 005__ 20160701171709.0
000002717 037__ $$aASTROimport-874
000002717 100__ $$avan Hoof, P. A. M.
000002717 245__ $$aThe Very Fast Evolution of the VLTP Object V4334 Sgr
000002717 260__ $$c2015
000002717 520__ $$aV4334 Sgr (Sakurai's object) is an enigmatic evolved star that underwent a very late thermal pulse a few years before its discovery in 1996. It ejected a new, hydrogen-deficient nebula in the process. Emission lines from the newly ejected gas were first discovered in 1998 (He i 10830 Å) and 2001 (optical). We have monitored the optical emission spectrum since. From 2001 through 2007 the optical spectrum showed an exponential decline in flux, consistent with a shock that occurred around 1998 and started cooling soon after that. In this paper we show that since 2008 the line fluxes have been continuously rising again. Our preliminary interpretation is that this emission comes from a region close to the central star, and is excited by a second shock. This shock may have been induced by an increase in the stellar mass loss and wind velocity associated with a rise in the stellar temperature. 
000002717 700__ $$a Kimeswenger, S.
000002717 700__ $$a Van de Steene, G. C.
000002717 700__ $$a Zijlstra, A. A.
000002717 700__ $$a Hajduk, M.
000002717 700__ $$a Herwig, F.
000002717 773__ $$c95$$p19th European Workshop on White Dwarfs$$v493$$y2015
000002717 85642 $$ahttp://esoads.eso.org/abs/2015ASPC..493...95V
000002717 905__ $$apublished in
000002717 980__ $$aNONREF