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An aluminum/calcium-rich, iron-poor, white dwarf star: evidence for an extrasolar planetary lithosphere?
calcium-rich iron-poor evidence extrasolar planetary lithosphere
2011/10/8
The presence of elements heavier than helium in white dwarf atmospheres is often a signpost for the existence of rocky objects that currently or previously orbited these stars. We have measured the ab...
Deep vlt spectroscopy of high redshift radio galaxy MRC 2104{242：evidence for a metallicity gradient
Deep vlt spectroscopy high redshift radio galaxy metallicity gradient
2009/6/10
Deep vlt spectroscopy of high redshift radio galaxy MRC 2104{242：evidence for a metallicity gradient。