Constraining circumstellar environments: Far-infrared observations of Herbig Ae/Be stars

Details Constraining circumstellar environments: Far-infrared observations of Herbig Ae/Be stars Constraining circumstellar environments: Far-infrared observations of Herbig Ae/Be stars

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...432..710d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 432, no. 2, p. 710-719

Astronomy and Astrophysics

Astronomy

39

A Stars, Accretion Disks, B Stars, Far Infrared Radiation, Spectral Energy Distribution, Stellar Envelopes, Infrared Astronomy, Star Formation, Stellar Models, T Tauri Stars, Temperature Distribution

Scientific paper

We have observed six Herbig Ae/Be stars at 50 and 100 microns with the Kuiper Airborne Observatory (KAO). All were classified as group I sources by Hillenbrand et al., signifying that their spectral energy distributions could be modeled with stars surrounded only by accretion disks. If the far-infrared emission is assumed to arise in a disk, it should be unresolved at 100 microns, regardless of the size of the disk. In contrast, we find that five out of six sources are clearly resolved at 100 microns. Three sources were also observed at 50 microns and at least two were resolved. Consequently the far-infrared emission must arise in another component, most plausibly a circumstellar envelope. This suggests that the group I sources may be less distinct from the group II sources than previously suggested. Since the presence of an envelope can affect both the actual temperature distribution in a disk and the temperature distribution derived from modeling the emission, more consistent models, including both disks and envelopes, are needed for these sources.

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