Abundance analysis of DAZ white dwarfs
Adela Kawka, Stephane Vennes, Frantisek Dinnbier, Helena Cibulkova,, Peter Nemeth
TL;DR
This study analyzes the elemental abundances in 33 hydrogen-rich white dwarfs using archival spectra, focusing on calcium, magnesium, and iron to understand their accretion sources and compositions.
Contribution
It provides the first detailed abundance analysis of a significant sample of DA white dwarfs, including new measurements and preliminary data on calcium in three additional objects.
Findings
Measured calcium, magnesium, and iron abundances in 30 white dwarfs.
Investigated abundance ratios to infer accretion source compositions.
Presented preliminary calcium abundances for three new white dwarfs.
Abstract
We present an abundance analysis of a sample of 33 hydrogen-rich (DA) white dwarfs. We have used archival high-resolution spectra to measure abundances of calcium, magnesium and iron in a set of 30 objects. In addition, we present preliminary calcium abundances in three new white dwarfs based on low-dispersion spectra. We investigate some abundance ratios (Mg/Ca, Fe/Ca) that may help uncover the composition of the accretion source.
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