Infrared imaging polarimetry of Monoceros R2 IRS

Details Infrared imaging polarimetry of Monoceros R2 IRS Infrared imaging polarimetry of Monoceros R2 IRS

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...235..387a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 235, no. 1-2, Aug. 1990, p. 387-394.

Astronomy and Astrophysics

Astronomy

35

Infrared Imagery, Infrared Sources (Astronomy), Molecular Clouds, Polarimetry, Pre-Main Sequence Stars, Stellar Spectrophotometry, Extremely High Frequencies, H Ii Regions, High Resolution, Nebulae, Spatial Resolution

Scientific paper

High spatial resolution 2.2 micron images and imaging polarimetry of the IRS region of the Mon R2 star forming region are presented. The data confirm that IRS2 is the illuminating source of the shell-like IR nebula. Some disruption of the centro-symmetric polarization vector pattern is seen in the interior of the shell and on IRS5. It is suggested that strong dichroic absorption by passage of IR radiation through aligned grains in the molecular cloud significantly affects the polarization seen due to scattering in this object. However, the mechanism by which such large K-band polarization (about 11 percent) could be created by dichroism remains unclear. The polarization of the shell tends to increase towards the boundary between the H II region and molecular cloud. Since the scattering material in the shell has to be optically thin at K, due to the large polarization found, the increase is most likely the result of the scattering geometry and caused by integration of polarization with a range of scattering angles along the line-of-sight. The exciting source of the H II region, IRS1, is found to be double. The fainter component at K is identified as the optical star B of Cohen and Frogel (1977). Numerous other point-like sources are found in the field.

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