Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272..137l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 1, 1983, p. 137-148. Research supported by the California Space
Astronomy and Astrophysics
Astrophysics
18
Astronomical Photometry, Infrared Spectra, Near Infrared Radiation, Planetary Nebulae, Spectrophotometry, Helium, Interstellar Extinction, Paschen Series, Radiant Flux Density, Stellar Models, Stellar Radiation
Scientific paper
An IR spectrophotometric study of 10 planetary nebulae in which strengths were measured for the Paschen lines Pa-beta and Pa-gamma, the forbidden S III lines 9069 and 9532 A, and He I 10830 A, yields line flux determinations indicating that excess continuum flux at 1.28 microns for five of the planetary nebulae is of central star origin. The central star radiation can be appreciable at 1.65 microns, where excesses found previously have been linked to radiation from hot dust. A discrepancy is noted between the measured ratio of the 10830 and 5876 A He triplet line fluxes and previously predicted values, though agreement between predicted and observed ratios is obtained with a model in which the dust optical depth, and therefore the attenuation of resonantly scattered 10830 A photons, decreases with nebular expansion.
Levan Paul D.
Rudy Richard J.
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