Sakurai's Object: A Rare Stellar Cataclysm

Details Sakurai's Object: A Rare Stellar Cataclysm Sakurai's Object: A Rare Stellar Cataclysm

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soust..38...80d&link_type=abstract

Southern Stars, vol. 38, issue 3, p.80-89

Physics

2

Scientific paper

Cataclysmic events during late stellar evolution in high- and low-mass stars are briefly described. Most noticeable, but rare, brightenings in single low-mass stars are the so-called "final helium flashes" or "born-again giants", which occur with different time-scales (years-decades) in about 10% of all stars. Besides the slowly evolving object FG Sge, three fast events have been observed in the last centuries for CK Vul, V605 Aql, and V4334 Sgr (Sakurai's Star). Five-colour observations of V4334 Sgr are presented, and it is shown that the brightness evolution in the first three years can be explained by a slowly expanding star radiating at almost constant bolometric luminosity. The resulting cooling of the outer layers leads to dramatic spectral changes (type a through F and G to that of a carbon-rich C spectrum). The later brightness evolution is dominated by formation of carbon particles, leading to R-Coronae-Borealis-like brightness drops.

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