Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244..511h&link_type=abstract
Astrophysical Journal, Part 1, vol. 244, Mar. 1, 1981, p. 511-516. NASA-NSF-supported research.
Astronomy and Astrophysics
Astrophysics
6
Argon, Forbidden Bands, Hydrogen Clouds, Infrared Spectra, Nebulae, Abundance, Astronomical Models, Stellar Atmospheres
Scientific paper
Observations of the [Ar II] (6.99 μm) line flux in W3 IRS 1 are combined with previously obtained measurements of the [Ar III] (8.99 μm) line flux. The observed ratio of [Ar II]/[Ar III] is inconsistent with the calculated ratio for an H II region with the densities required by radio observations and with a central 40,000-45,000 K star with atmosphere as described by a Mihalas model. A softer effective UV radiation field is required; a dusty model we had previously invoked fits the observations. In addition we determine that the argon abundance is n(Ar)/n(H) ≍ 8 × 10-6, a value about twice that usually adopted for normal solar abundance; however, there are uncertainties in the extinction and the model which do not allow us to preclude solar abundance.
Helfer Lawrence H.
Herter Terry
Pipher Judith L.
Puetter Richard C.
Rudy Richard J.
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