Spectral modeling of gaseous metal disks around DAZ white dwarfs

Details Spectral modeling of gaseous metal disks around DAZ white dwarfs Spectral modeling of gaseous metal disks around DAZ white dwarfs

2008-09-30

arxiv.org/abs/0809.5200v1

J.Phys.Conf.Ser.172:012054,2009

Astronomy and Astrophysics

Astrophysics

Proceedings, 16th European White Dwarf Workshop, Barcelona, 2008

Scientific paper

10.1088/1742-6596/172/1/012054

We report on our attempt for the first non-LTE modeling of gaseous metal disks around single DAZ white dwarfs recently discovered by Gaensicke et al. and thought to originate from a disrupted asteroid. We assume a Keplerian rotating viscous disk ring composed of calcium and hydrogen and compute the detailed vertical structure and emergent spectrum. We find that the observed infrared CaII emission triplet can be modeled with a hydrogen-deficient gas ring located at R=1.2 R_sun, inside of the tidal disruption radius, with Teff about 6000 K and a low surface mass density of about 0.3 g/cm**2. A disk having this density and reaching from the central white dwarf out to R=1.2 R_sun would have a total mass of 7 10**21 g, corresponding to an asteroid with about 160 km diameter.

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