Other
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt........24c&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF CALIFORNIA, LOS ANGELES, 1995.Source: Dissertation Abstracts International, Volume: 56-12, Sectio
Other
1
Cepheus A, Star Formation
Scientific paper
A two-channel infrared camera was designed, built, and tested at UCLA. A polarimeter system was also constructed to work with this camera. The camera was shown to work very well with good sensitivity and image quality in direct imaging and polarimetry observing modes. The design, design method, and test results for these systems are presented. The efficiency of the polarization measurements was also tested and shown to be in excess of 92% at 2.2mu m. Once complete, the camera was used to observe Young Stellar Objects (YSOs) that are deeply embedded in their parent molecular cloud. Polarization and photometric imaging data were obtained for several sources in addition to a small survey of a subclass of these sources, bipolar outflows. The Cepheus A region was particularly studied and a center of light for the polarized nebula was determined. This shows good coincidence with a radio continuum source discovered by Hughes and Wouterloot (1984). We also compared the data to scattered light models of Whitney & Hartmann (1992, 1993). These models may indicate a second outflow though it must be virtually spatially coincident with the primary outflow. We compare observations of other, lower-mass YSOs to these models as well. In all cases, we show good agreement, implying the existence of a circumstellar disk of approximately 100 AU and a cylindrical or cone-shaped evacuated cavity. The implications for the scattering material is briefly discussed in terms of these models.
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