The Cepheus A Region as a Probe of Dust Chemistry

Details The Cepheus A Region as a Probe of Dust Chemistry The Cepheus A Region as a Probe of Dust Chemistry

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7902k&link_type=abstract

American Astronomical Society Meeting 210, #79.02; Bulletin of the American Astronomical Society, Vol. 39, p.187

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new spectroscopic 2.4 - 5.5 µm observations of the dusty infrared reflection nebula within the Cepheus A molecular cloud located at 730pc in the Cepheus OB3 association. With a spectral resolution of R 1000, we observed the 3.07 µm water ice band, the 3.4 µm long-wavelength water ice wing, the 3.47 µm ''diamond" wing, and the 4.67 µm CO ice band. Observations were taken along three orientations of a 0.8'' x 15'' slit and data were reduced separately along each slit in order to probe many spatial locations simultaneously. We have studied the relationship between the spectroscopic signatures of different dust components in this region of active star formation. The observations reveal large variations in the foreground extinction, particularly near the embedded source, HW2. In addition, we find a good correlation between the water and CO optical depths. These findings will help to elucidate the structure of the Cepheus A cloud and the effects of protostars on their dusty environment.

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