Applying the accretion-diffusion model to a sample of DAZ without IR excess

Details Applying the accretion-diffusion model to a sample of DAZ without IR excess Applying the accretion-diffusion model to a sample of DAZ without IR excess

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1273..412d&link_type=abstract

17TH EUROPEAN WHITE DWARF WORKSHOP. AIP Conference Proceedings, Volume 1273, pp. 412-417 (2010).

Computer Science

Databases

2

White Dwarfs, Accretion Disks, Circumstellar Matter, Sky Surveys, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Accretion And Accretion Disks, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers, Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc.

Scientific paper

We consider a sample of five stars with effective temperatures lower than 25,000 K and showing a range of metallicities. One star exhibits a host of metal lines from multiple species while the others show lines from one or two species. The most likely origin of metals detected in stars of this type is the accretion of matter from circumstellar material, although none of the objects considered in this study bears the signature of a dust disk frequently detected through IR excess in DAZ. The aim of this paper is to explain the peculiar abundance patterns observed in these stars in terms of the accretion-diffusion model and infer the source of the circumstellar matter. To achieve this, we perform time-dependent diffusion calculations accounting for radiative levitation, which is not entirely negligible for some of the light species (C, Si, and Al).

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