Computer Science
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phdt.........4k&link_type=abstract
PhD Thesis, University of London, II+176 .(2003)
Computer Science
Scientific paper
MWC 297 is a highly but not extremenly reddened young star in the Aquila Rift, and is the focal point of this thesis. Through optical spectroscopy observations of MWC 297 we established several stellar parameters and expanded our (indeed very limited) knowledge of the photospheric properties of higher mass YSOs. We confirm and further strengthen the case that MWC 297 is located at the Aquila Rift, and has a distance of ~250 pc, making this object the closest known example of a massive YSO. Our multi epoch optical spectra indicate an unusual 'photospheric' spectral behaviour, possible related to the presence of a circumstellar disk. We have studied the Diffuse Interstellar Band spectrum towards MWC 297, in our effort to quantify the relative contributions to the extinction towards this object from the Aquila Rift and its circumstellar environment. We turned our attention to the large scale morphology of MWC 297's environment, and examined several forbidden line profiles. We suggest that our findings could be explained by assuming that these form quite close to a circumstellar disk. In order to evaluate this interpretation we synthesized numerically forbidden line profiles, assuming a relatively dense and slow equatorial disk wind and including the rotational velocity component of the flow. Our results can partially explain the observations. Instigated by the striking morphology seen in the 5GHz MERLIN radio map of MWC 297 presented by Drew et al. (1997) we modelled the radio emission for different anisotropic outflow geometries. Our models reproduce well the observed radio of properties of MWC 297, with the best fit given by the 'hybrid' model, that involves the presence of a bipolar outlfow and of a equatorial disk wind, implying a view angle of 55 deg. Our results also suggest a similar mass loss rate of 1x10-7 Msol/yr.
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