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Secular contraction in extreme helium stars and the future of V4334 Sgr
 

Summary: Secular contraction in extreme helium stars and the
future of V4334 Sgr
C.S. Jeffery (csj@star.arm.ac.uk)
Armagh Observatory
R.L.C. Starling (rlcs@mssl.ucl.ac.uk)
Mullard Space Science Laboratory
P.W. Hill y
University of St Andrews
D. Pollacco (d.pollacco@qub.ac.uk)
Queens University Belfast
Several analyses of the optical spectrum and light curve of V4334 Sgr
have made direct comparisons with the R Corona Borealis (RCrB)
stars. There is evidence that V4334Sgr is the product of a final helium
flash in a hot white dwarf or planetary nebula central star (Duerbeck
& Benetti, 1996). There have been suggestions that RCrBs are also
products of a final helium flash (Iben et al., 1983). An evolution­
ary link between RCrBs and the hotter extreme helium stars (EHes:
Sch¨onberner, 1979) seems credible, although by no means proven. De­
spite evidence that V4334Sgr and RCrBs have anything but a fleeting
similarity in spectral type, as discussed elsewhere in these proceedings

  

Source: Armagh Observatory
Jeffery, Simon - Armagh Observatory

 

Collections: Physics