De Marco, O; Jones, AF; Barlow, MJ; Cohen, M; Bond, HE; Harmer, D; (2004) The dual dust chemistry - Binarity connection. In: Meixner, M and Kastner, JH and Balick, B and Soker, N, (eds.) Proceedings of the Asymmetrical Planetary Nebulae III: Winds, Structure and the Thunderbird. (pp. pp. 100-103). Astronomical Society of the Pacific: San Francisco.

Preview

Text 0309789v1.pdf - Accepted Version Download (72kB) | Preview

Abstract

Accumulating evidence points to a binary nature for the Wolf-Rayet ([WC]) central stars, a group that constitutes about 15% of all central stars of planetary nebula. From ISO observations, a dual dust chemistry (oxygen- and carbon-rich) has been shown to be almost exclusively associated with [WC] central stars, a fact that could be explained by O-rich dust residing in a disk, while the C-rich dust is more widely distributed. HST/STIS spatially resolved spectroscopy of the [WC10] central star \cpd\ is interpreted as revealing a dust disk or torus around the central star. This, together with \cpd's variable lightcurve, is taken as an indirect indication of binarity. Finally, we present here, for the first time, preliminary results from a radial velocity survey of central stars. Out of 18 stars with excellent data at least 8 are radial velocity variables. If these turn out to be binaries, it is likely that the central star binary fraction is as high as ∼50;%.

Download activity - last month

Export as JSONXMLCSV

Download activity - last 12 months

Export as JSONXMLCSV

Downloads by country - last 12 months

Export as XMLJSONCSV

Archive Staff Only

View Item