Unlocking the Past of Sakurai's Object Using FORS/VLT

Details Unlocking the Past of Sakurai's Object Using FORS/VLT Unlocking the Past of Sakurai's Object Using FORS/VLT

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000msngr.101...27k&link_type=abstract

The Messenger, vol. 101, p. 27-30

Astronomy and Astrophysics

Astronomy

4

Scientific paper

Sakurai's object (V4334 Sgr) was discovered by Japanese amateur astronomer Y. Sakurai in February 1996 and first classified as a slow nova. Follow-up observations though immediately showed this to be a very special object indeed. It turned out to be a true stellar chameleon, perhaps the most rapidly evolving star ever witnessed. Details of its discovery and early observations are found in Duerbeck et al. (1996, 1997), Kerber et al. (1998) and Clayton & de Marco (1997). We have now used the combined power of FORS/VLT in order to deepen our insight into this object and its evolution. Using FORS/VLT observations, we have obtained the best spectrum of the old PN surrounding Sakurai's object. We have derived improved values for the interstellar reddening and we have been able to reliably measure additional diagnostic lines. In particular, the value found for the He II 4686 line is in excellent agreement with our earlier model calculations. We thereby confirm the previous result that the star was a hot, highly evolved PN nucleus before the flash.

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