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- W2134480064 abstract "The luminosity of the central star of the compact HII regions of NGC 7538 was estimated from the solid angle of the IR sources subtended relative to the central star, and was found to be times as intense as that of IR sources. Under the single central star approximation, the luminosity gives a stellar UV photon rate of ~, ~, ~, and ~ for the compact HII regions of NGC 7538-IRS1(A/2), B, IRS2, and IRS3, respectively. and the observed electron density, , provide the dust opacity of the ionizing photon, , for the optical path out to the Strömgren sphere radius , assuming a gas with standard dust content. Ionizing photon opacity over the same optical path but with the actual dust content is also derived from , where is the radius of the ionized sphere, which is estimated from and the observed volume emission measure (Spitzer [CITE]). An observational trend of , where , was obtained for the 4 compact HII regions of the NGC 7538(N). Fourteen selected compact HII regions from data catalogued by VLA observations were examined for this trend, and a similar result was obtained. A limit of γ as was given for the 14 selected sources. The size of the dust-depleted cavity of the NGC 7538(N) suggested by Chini et al. ([CITE]) coincides with that of the ionized sphere of the IRS2 of the region." @default.
- W2134480064 created "2016-06-24" @default.
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- W2134480064 date "2005-02-01" @default.
- W2134480064 modified "2023-09-25" @default.
- W2134480064 title "Dust content in compact HII regions (NGC 7538-IRS1, IRS2, and IRS3)" @default.
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- W2134480064 doi "https://doi.org/10.1051/0004-6361:200400116" @default.
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