Origin of metal-deficiency in hot white dwarfs

Details Origin of metal-deficiency in hot white dwarfs Origin of metal-deficiency in hot white dwarfs

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005cxo..prop.1892w&link_type=abstract

Chandra Proposal ID #07200466

Physics

Chandra Proposal Id #07200466

Scientific paper

We propose to observe one of a few peculiar hot hydrogen-rich white dwarfs. Its photospheric metal abundance is much lower than predicted by diffusion/levitation theory which is generally able to explain the observed EUV/soft X-ray flux from white dwarfs by stratified element abundances in the photospheres. Our immediate aim is to find out from Fe and Ni lines detectable in LETG/HRC-S spectra if the metals in this star are stratified at all, or if they are homogeneously mixed in the atmosphere. If we can prove stratification, then the usual diffusion/levitation equilibrium assumption is lacking an important ingredient. If we prove homogeneity, then some process (mixing, mass-loss) must be acting, in contrast to our current understanding of these processes.

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