Mid-Infrared Imaging of Candidate Vega-Like Systems

Abstract

We have conducted deep mid-infrared imaging of a relatively nearby sample of candidate Vega-like stars using the OSCIR instrument on the CTIO 4-meter and Keck II 10-meter telescopes. Our discovery of a spatially-resolved disk around HR 4796A has already been reported (Jayawardhana et al. 1998). Here we present imaging observations of the other members of the sample, including the discovery that only the primary in the HD 35187 binary system appears to harbor a substantial circumstellar disk and the possible detection of extended disk emission around 49 Ceti. We derive global properties of the dust disks, place constraints on their sizes, and discuss several interesting cases in detail. Although our targets are believed to be main sequence stars, we note that several have large infrared excesses compared to prototype Vega-like systems, and may therefore be somewhat younger. The disk size constraints we derive, in many cases, imply emission from relatively large ($\gtrsim$ 10$\mu$m) particles at mid-infrared wavelengths.

15 pages and 2 PostScript figures, accepted for publication in The Astronomical Journal

References in corpus (6)

• Deep 10 and 18 micron Imaging of the HR 4796A Circumstellar Disk: Transient Dust Particles & Tentative Evidence for a Brightness Asymmetry
• A disk census for the nearest group of young stars: Mid-infrared observations of the TW Hydrae Association
• Mid-infrared imaging of the young binary star Hen 3-600: Evidence for a dust disk around the primary
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• Protoplanetary Disks in the Nearest Star-Forming Cloud: Mid-Infrared Imaging and Optical Spectroscopy of MBM 12 Members
• New Stars on the Block

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