Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.0607g&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #06.07; Bulletin of the American Astronomical Society, Vol. 29, p.1217
Astronomy and Astrophysics
Astronomy
Scientific paper
Two key factors combine to affect the infrared spectral energy distribution(SED) of a massive star-forming (H II) region: the stellar population; and the distribution of dust and gas around the luminous stars, particularly the solid angle subtended by molecular material as viewed from the stars. The molecular cloud ``covering fraction'' decreases from 4pi sr to 2pi sr to practically zero as the H II region evolves through compact, blister, and extended, low-density phases, respectively. Using data from the COBE Diffuse Infrared Background Experiment (DIRBE), we have measured the IR SEDs of five isolated massive star-forming regions: S 90, Cep A, S 187, W5 NE, and S 287. In addition to the 1 - 240 mu m DIRBE SEDs, we present J, H and K band photometry derived from recently obtained near-IR images of these regions. With the aid of future 2 mu m spectroscopic observations it will be possible to locate and classify visually obscured O and early-B type stars, providing a direct census of the stellar populations, virtually uncompromised by extinction effects. Information about the distribution of molecular and diffuse interstellar matter around the stars can be derived from multiwavelength survey data. From these independent data sets we will develop a classification scheme for the IR SEDs. Such a scheme might some day be useful in interpretations of galactic spectral energy distributions, which vary in form and often are the only available source of information about galactic star forming activity.
Digel Seth
Guo Zhi
Hanson Margaret Murray
Leisawitz David
Mendez Bryan
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