Constraining Circumstellar Environments: High-resolution Far-Infrared Observations of Herbig Ae/Be Stars

Details Constraining Circumstellar Environments: High-resolution Far-Infrared Observations of Herbig Ae/Be Stars Constraining Circumstellar Environments: High-resolution Far-Infrared Observations of Herbig Ae/Be Stars

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.3417d&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #34.17; Bulletin of the American Astronomical Society, Vol. 25, p.851

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Observations of 6 Herbig Ae/Be stars (AB Aur, MWC 137, LkHα 215, MWC 297, LkHα 234, and MWC 1080) have been made at 50 and 100 microns with the Kuiper Airborne Observatory in an attempt to constrain their circumstellar environments. All sources examined were previously classified as Group I by Hillenbrand et al. 1992, indicating that their far-infrared spectral energy distributions could be specified solely by a model of a circumstellar disk. This model implies that they should be unresolved with our instrument's ~ 30 arcsecond beam at 100 microns, regardless of the sizes of their disks. In contrast, we find that 5 out of 6 sources are clearly resolved with our beam suggesting that the far-infrared emission must arise in another component, possibly a circumstellar envelope. Only AB Aur was found to be unresolved. Since envelopes have been also observed around Group II Herbig Ae/Be stars, the presence of envelopes around the other 5 sources suggests that these two groups of Herbig Ae/Be stars are less distinct than previously thought. In addition, since a circumstellar envelope can affect the actual temperature distribution of a disk inside the envelope, more consistent models of these objects, including disks and envelopes, are needed.

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