Element abundances in cool white dwarfs. II. Ultraviolet observations of DZ white dwarfs

Details Element abundances in cool white dwarfs. II. Ultraviolet observations of DZ white dwarfs Element abundances in cool white dwarfs. II. Ultraviolet observations of DZ white dwarfs

2002-04-24

arxiv.org/abs/astro-ph/0204408v1

Astron.Astrophys. 385 (2002) 995

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1051/0004-6361:20020194

We present a small data base of homogeneously derived photospheric element abundances of DZ white dwarfs and related objects. Our previous investigations are supplemented with the analysis of ultraviolet spectra for nine white dwarfs. Of particular interest is the detection of Lalpha absorption in van Maanen 2 and a determination of the effective temperature of this star. The new value is about 1000K lower than previous results due to the strong ultraviolet absorption by metals which has to be considered consistently. The metal abundances of our sample stars are compatible with the predictions from the two-phase accretion model of Dupuis et al. (1992, 1993). Small deviations can be observed for the abundance ratios in some objects. This could indicate non-solar metal-to-metal ratios in the accreted material. Hydrogen can be detected in virtually all of our objects. However, its average accretion rate must be at least two orders of magnitude lower than the metal accretion rate.

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