Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997acasn..38..412s&link_type=abstract
Acta Astronomica Sinica, vol. 38, p. 412
Astronomy and Astrophysics
Astronomy
Far Infrared Radiation, Hertzsprung-Russell Diagram, Star Formation, Astronomical Photometry, Infrared Astronomy Satellite, Infrared Photometry, Spectral Energy Distribution
Scientific paper
Young stellar objects (YSOs) were studied using a set of bright FIR sources selected from IRAS-PSC and associated with high-mass YSOs. A modified blackbody photospheric model, double-shell dust emission model, and a detailed radiation transfer model were used to fit the observed infrared fluxes, and some physical parameters, such as the photospheric temperature of the central star, the circumstellar extinction, and thermal structure of dust shell were derived. Using the derived photospheric temperatures and corresponding stellar luminosities, we have determined the positions on an extended H-R diagram and the evolution properties of the investigated bright FIR sources. We have found that there is a trend of continuous increase of the infrared spectral slope S (12-60) from 12 to 60 microns along the direction to main sequence stars at the same mass line of H-R diagram. For the YSOs, which are evolving at the same time, there is also a trend of increase of S (12-60) with mass. We analyzed the nature of the bright FIR sources. It seems that the extended H-R diagram presented here is a good means to study this kind of objects, which are deeply embedded in molecular clouds and dust envelopes.
Sun Jin
Tang Ge-Shi
Zhang Yan-Ping
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