The Nature of the Dust around Lambda Bootis Stars: Debris Disks or Reflection Nebulae

Details The Nature of the Dust around Lambda Bootis Stars: Debris Disks or Reflection Nebulae The Nature of the Dust around Lambda Bootis Stars: Debris Disks or Reflection Nebulae

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30858k&link_type=abstract

Spitzer Proposal ID #30858

Computer Science

Scientific paper

The group of lambda Bootis stars comprises late B- to early F-type, Population I stars with apparently solar abundances of C, N, O, and S as well as underabundances of the Fe-peak elements. Earlier investigations showed that the abundance pattern resembles much the depletion pattern found in the gas-phase of the interstellar medium, where refractory elements like iron and silicon have condensed into dust grains. Infrared measurements by IRAS, ISO and recently Spitzer (MIPS), indicate the presence of dust in the environment around the lambda Bootis stars. Kamp & Paunzen recently explained the lambda Bootis abundance pattern in the framework of a diffusion/accretion scenario, where the star passes through an interstellar cloud and accretes the metal-poor gas. Since SED modeling is inconclusive in distinguishing between disk emission and a reflection nebula, we propose to carry out infrared spectroscopy and imaging of 35 lambda Bootis stars to clarify the nature of the infrared excess around these stars: is the dust distributed in a circumstellar debris disk and thus linked to the formation of planetary systems, or is it interstellar material further out in a reflection nebulosity. We propose IRS mapping in low resolution mode and IRAC imaging to discriminate between these two scenarios and to possibly detect emission from polycyclic aromatic hydrocarbons - a common component of the interstellar medium - around lambda Bootis stars.

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