The hidden past of Sakurai's object. Stellar properties before the final helium flash

Details The hidden past of Sakurai's object. Stellar properties before the final helium flash The hidden past of Sakurai's object. Stellar properties before the final helium flash

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...344l..79k&link_type=abstract

Astronomy and Astrophysics, v.344, p.L79-L82 (1999)

Astronomy and Astrophysics

Astrophysics

34

Stars: Agb And Post-Agb, Stars: Evolution, Stars: Hertzsprung-Russel (Hr) And C-M Diagrams, Ism: Planetary Nebulae: Individual: Sakurai'S Object, Stars: Variables: General

Scientific paper

We derive the properties of Sakurai's object before its sudden evolutionary change by studying the remnant ionization of the old planetary nebula (PN) surrounding it. The star must have had a surface temperature of 98 000 +/- 7000 K (95 000 +/- 7000 K). For a distance of 1.5 kpc (5.5 kpc) the luminosity should have been 25 +/- 5 Lsun (240 +/- 40 Lsun). The central star thus was highly evolved and had already reached the tip of the white dwarf cooling track. Sakurai's object indeed is an example of a star undergoing a very late helium flash.

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