HS 0146+1847 - a DAZB white dwarf of very unusual composition

Details HS 0146+1847 - a DAZB white dwarf of very unusual composition HS 0146+1847 - a DAZB white dwarf of very unusual composition

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...439..317k&link_type=abstract

Astronomy and Astrophysics, Volume 439, Issue 1, August III 2005, pp.317-321

Astronomy and Astrophysics

Astrophysics

45

Stars: White Dwarfs, Stars: Atmospheres, Stars: Abundances

Scientific paper

HS 0146+1847, originally identified as a white dwarf candidate in proper motion surveys, was rediscovered as a candidate in the Hamburg Quasar Survey. Spectra obtained for the SPY (ESO Supernova Ia Progenitor) survey show strong Balmer and Ca II lines, suggesting a classification as DAZ white dwarf. Contrary to the objects known so far in this class, HS 0146+1847 has a helium-rich atmosphere at ?= 11 500 K. This is confirmed by very weak He lines, changing the classification to DAZB. Mg and Fe lines are also detected. We discuss the physics of Balmer line broadening by neutral helium, present a spectral analysis and note some implications for the accretion/diffusion scenario of heavy elements in cool white dwarfs.

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