On the nickel abundance in hot hydrogen-rich white dwarfs

Details On the nickel abundance in hot hydrogen-rich white dwarfs On the nickel abundance in hot hydrogen-rich white dwarfs

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...286l..31w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 286, no. 2, p. L31-L34

Astronomy and Astrophysics

Astronomy

28

Abundance, Iron, Line Spectra, Nickel, Stellar Atmospheres, Ultraviolet Astronomy, Ultraviolet Spectra, White Dwarf Stars, Iue, Local Thermodynamic Equilibrium, Radiative Transfer

Scientific paper

We present non-local thermodynamic equilibrium (non-LTE) iron and nickel abundance analysis of four hot hydrogen rich white dwarfs from high resolution IUE spectra. The investigation aims at the determination of the Ni/Fe ratio in order to investigate if radiative acceleration prevents gravitational settling of both elements. We succeeded in the first identification of nickel lines in white dwarfs. In fact we find enhanced Ni/Fe ratios (compared to the solar value) in the two extremely iron rich (for white dwarf standards) stars RE0623-377 and RE2214-492. The effect is slightly smaller in the other two objects considered (G191-B2B and Feige 24). This is regarded as evidence that radiation pressure acting through the huge number of spectral lines is responsible for radiative levitation of iron and nickel.

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