The far-ultraviolet flux from Lambda Orionis A

Details The far-ultraviolet flux from Lambda Orionis A The far-ultraviolet flux from Lambda Orionis A

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223..234h&link_type=abstract

Astrophysical Journal, Part 1, vol. 223, July 1, 1978, p. 234-237. NSF-NASA-supported research.

Astronomy and Astrophysics

Astronomy

1

Emission Spectra, Far Ultraviolet Radiation, Interstellar Gas, Nebulae, Ultraviolet Spectra, H Ii Regions, Hydrogen Ions, Line Spectra, Oao 3, Ultraviolet Astronomy

Scientific paper

Digicon observations of emission-line intensities in the H II region around Lambda Ori are used to determine the effective UV ionizing flux from Lambda Ori A. It appears that the flux shortward of 353 A (and perhaps shortward of 504 A) is significantly less than predicted from calculations of static stellar atmospheres. The discrepancy between theory and observation may be a consequence of the existence of an extended atmosphere due to radiation-pressure-driven mass loss. The results are consistent with those obtained from UV absorption-line studies made with the Copernicus satellite and with radio recombination-line data for compact H II regions.

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