SIMBAD references

1999A&A...344L..79K - Astronomy and Astrophysics, volume 344, L79-82 (1999/4-3)

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

KERBER F., KOEPPEN J., ROTH M. and TRAGER S.C.

Abstract (from CDS):

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 98000±7000K (95000±7000K). For a distance of 1.5kpc (5.5kpc) the luminosity should have been 25±5L_☉ (240±40L_☉). 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.

Abstract Copyright: ∼

Journal keyword(s): 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

Simbad objects: 4

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