The spectral energy distribution of HH 30 measured with ISO

Details The spectral energy distribution of HH 30 measured with ISO The spectral energy distribution of HH 30 measured with ISO

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..521s&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 521

Physics

12

Accretion Disks, Young Stars

Scientific paper

Herbig-Haro 30 is a prototype young stellar object (YSO) accretion disk system located in the nearby Taurus L1551 molecular cloud. Hubble Space Telescope images have shown that HH 30 appears as a nearly edge-on, optically thick circumstellar disk extending perpendicular to highly collimated bipolar jets. As the first YSO disk to have its vertical structure clearly resolved, HH 30 presents a unique opportunity to combine our understanding of a disk's geometry and its spectral energy distribution (SED). ISO photometry using CAM and PHT have been obtained over the wavelength range of 5-90 μm, filling important gaps in the observed SED of this object. We find that the SED is double-peaked, with one peak at 2 μm and a second somewhere beyond 60 μm. A weak silicate absorption feature may be present. Given that HH 30 appears entirely as scattered light in images made at 2 μm, the decline in the SED between 2-14 μm appears best explained by self-absorption of the disk's thermal emission resulting in the system being dominated by scattered light in the mid-infrared. At 25 μm the SED rises again as the disk emission at last penetrates the extinction. The consequences of these results for our understanding of this prototype accretion disk system are discussed.

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