A study of the infrared spectrum of massive young stellar objects

Details A study of the infrared spectrum of massive young stellar objects A study of the infrared spectrum of massive young stellar objects

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cha%26a..23...51z&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 23, Issue 1, p. 51-58.

Astronomy and Astrophysics

Astrophysics

Scientific paper

This paper studies a set of 12 massive young stellar objects, based on their infrared spectra from IRAS, infrared data from other observatories and our own JHK photometric data. From the low-resolution spectra between 7-23 μm, the dust particles are classified into three types, those showing clearly the 9.7 μm silicate feature, the 11.3 μm PAH feature and others. Using a symmetric and isotropic model of radiative transfer that includes both absorption and scattering, we obtain the physical parameters of these YSOs. From the model fitting, we find (1) that in the majority of envelopes the dust temperature varies as the radius to the power -0.4, the same as the value expected if the absorption/emission ratio varies as νβ and β = 1, and (2) that the dust density varies as the radius to a power between -2.0 and ~ -1.5, which indirectly reflects the transition of the molecular envelope from isothermal collapse to the free fall regime.

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