Abstract
view Abstract Citations (51) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The 10 micron silicate feature in southern H II regions. Persson, S. E. ; Frogel, J. A. ; Aaronson, M. Abstract Intermediate-band photometric measurements in the 10 region are presented for 22 infrared sources associated with southern H ii regions. The energy distributions display substantial silicate absorption with optical depths at band center (9.8 i ) ranging from 0.4 to 5.0. The depth of the 9.8 band is related to the depth of 6 cm formaldehyde absorption in the sense that T(9.8 must exceed 2 for r(H2CO) to exceed 0.03. The effect of the silicate absorption is to attentuate the intrinsic 1-25 luminosities by as much as a factor of 5. Subject headings: infrared: general - interstellar: molecules - nebulae: general Publication: The Astrophysical Journal Pub Date: September 1976 DOI: 10.1086/154659 Bibcode: 1976ApJ...208..753P Keywords: Absorption Spectra; H Ii Regions; Infrared Radiation; Interstellar Gas; Silicates; Formaldehyde; Interstellar Extinction; Nebulae; Optical Thickness; Spectral Energy Distribution; Astrophysics full text sources ADS | data products SIMBAD (25)
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