Modeling the Circumstellar Infrared Emission of AC Herculis: Shell or Disk?

Details Modeling the Circumstellar Infrared Emission of AC Herculis: Shell or Disk? Modeling the Circumstellar Infrared Emission of AC Herculis: Shell or Disk?

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21440225g&link_type=abstract

American Astronomical Society, AAS Meeting #214, #402.25

Physics

Optics

Scientific paper

We assemble all available multi-wavelength data of AC Herculis, a post-AGB star, to construct a quasi-simultaneous spectral energy distributions (SED) from the ultraviolet to submillimetre. We model the dust emission SED in terms of either an edge-on circumbinary disk structure (as indicated by the Keck 11.7 and 18.7 micron images obtained by Jura et al. 2000, ApJ, 541, 264) or a circumstellar shell (as suggested by the MMT Adaptive Optics 9.8, 11.7 and 18 micron mid-IR imaging observations of Close et al. 2003, ApJ, 598, L35). Our best-fit models indicate that the shell model needs a stationary outflow, while the disk model favours a rather flat surface density distribution. These two models differ much in model IR images.

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