Optical spectroscopy of the candidate luminous white dwarf in the young LMC cluster NGC1818

M. R. Burleigh,R. A. Saffer, G. F. Gilmore,R. Napiwotzki

Monthly Notices of the Royal Astronomical Society（2008）

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摘要

An optical spectrum of the Elson et al. candidate luminous white dwarf in the young LMC cluster NGC 1818 shows conclusively that it is not a degenerate star. A model atmosphere fit gives Teff≈31 500 K and log g≈4.4, typical of a normal main-sequence B star. However, if it is a true LMC member then the star is underluminous by almost 3 mag. Its position in the cluster colour-magnitude diagram also ...

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关键词

stars: evolution,white dwarfs,globular clusters: individual: NGC 1818,Magellanic Clouds

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