Observations of Intermediate Mass Stars and their Circumstellar Environments with Nulling Interferometry

Details Observations of Intermediate Mass Stars and their Circumstellar Environments with Nulling Interferometry Observations of Intermediate Mass Stars and their Circumstellar Environments with Nulling Interferometry

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20912704l&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #127.04; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results from 10 micron nulling interferometric observations of intermediate mass stars at the 6.5 m MMT and Magellan I observatories. These observations include a survey of 13 Herbig Ae stars, in order to characterize the distribution warm circumstellar dust, as well as observations of main-sequence A-type stars, with the purpose of detecting exozodiacal dust in the habitable zone of these systems. For the Herbig Ae observations, we conclusively spatially resolve three disks, surrounding HD 100546, AB Aur, and HD 179218. We find evidence that objects with mid-IR SEDs in Meeus et al. (2001) Group I (constant to rising mid-IR flux with increasing wavelength) are more resolvable. We also find a correlation between disk size vs. sub-mm SED slope and fractional IR luminosity. For the survey of main-sequence stars, we present limits on levels of exozodiacal emission and spatial distribution for 6 nearby stars. These include observations of Vega where we have constrained the density of habitable zone dust to 650 zodis, evidence that the circumstellar debris is collisionally dominated.

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