Circum-binary Disks Around Post-AGB Systems

Details Circum-binary Disks Around Post-AGB Systems Circum-binary Disks Around Post-AGB Systems

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340912r&link_type=abstract

American Astronomical Society, AAS Meeting #213, #409.12; Bulletin of the American Astronomical Society, Vol. 41, p.209

Astronomy and Astrophysics

Astronomy

Scientific paper

Many post-AGB systems show peculiar abundances which can be explained by processing of material on circumstellar grains. Furthermore their SEDs reveal a NIR excess indicating dust at near-sublimation temperatures. Many of these systems are single-lined spectroscopic binary systems and these characteristics point to a stable, circum-binary disk of material. The role of binarity in shaping Planetary Nebulae is a topic of hot debate. Post-AGBs are precursors of PNe and unlike the latter are bright in the IR and optical. We present here a study of these systems at high resolution: both spectral and spatial. IR spectroscopy, especially of the roto-vibrational lines of CO and H20, using PHOENIX at Gemini South telescope, probe the kinematics and composition of the gas near and in the inner walls of the disk. These provide evidence of Keplerian rotation and indicate a common-envelope phase origin of the disk. Near-IR interferometry from the CHARA facility at Mt.Wilson can resolve the sizes of the inner dust at milliarcsecond scales. Together these complementary studies help us model this complex class of circumstellar disks, with many analogies to the well-studied YSO disks.

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