Absolute spectrophotometry of V1016 Cygni - O I/8446 A/ line

Details Absolute spectrophotometry of V1016 Cygni - O I/8446 A/ line Absolute spectrophotometry of V1016 Cygni - O I/8446 A/ line

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..583s&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Jan. 15, 1981, p. 583-588.

Astronomy and Astrophysics

Astrophysics

4

H Alpha Line, Hot Stars, Infrared Spectra, Oxygen Spectra, Stellar Spectrophotometry, Atomic Excitations, Line Shape, Optical Thickness, Stellar Luminosity, Stellar Models

Scientific paper

High-resolution observations in the near-infrared region were carried out on the peculiar object V1016 Cyg at 8446 A (O I) during a time interval of 6 months. In this period the line intensity showed no appreciable variations, being approximately 5 x 10 to the -12th ergs/sq cm s. By comparison with H-alpha measurements an unusual H-alpha optical depth /tau(H-alpha) equals 10,000/ together with a very small tau(O I) (8446 A) are derived. The excitation mechanism of the O I line seems to be resonance-fluorescence by trapped L-beta photons. By considering the diffusion of resonance lines in a neutral shell a typical dimension of the order of 10 to the 17th cm is derived.

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