Ultraviolet radiation from planetary nebulae

Details Ultraviolet radiation from planetary nebulae Ultraviolet radiation from planetary nebulae

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....62...95p&link_type=abstract

Astronomy and Astrophysics, vol. 62, no. 1-2, Jan. 1978, p. 95-110. Research sponsored by the Koninklijke Nederlandse Akademie

Astronomy and Astrophysics

Astrophysics

78

Planetary Atmospheres, Planetary Nebulae, Ultraviolet Radiation, Black Body Radiation, Hertzsprung-Russell Diagram, O Stars, Stellar Models, Ubv Spectra, Wolf-Rayet Stars

Scientific paper

Intermediate-band observations of about 30 planetary nebulae in the spectral region from 1500 to 3300 A are used to obtain information about the atmospheres, particularly the effective temperatures, of the central exciting stars. Separation of the nebular emission and the emission from the central star is described in detail, and the resultant UV fluxes from the central stars are presented for stars of various spectral types, including 10 O stars, two continuum stars, three Wolf-Rayet stars, three O VI stars, four Abell objects, and three unclassified central stars. It is shown that the central stars often do not radiate as blackbodies over the spectral range from 1550 to 5500 A. Zanstra temperatures are determined for the central stars, effective temperatures are derived from total fluxes, and a criterion is formulated for distinguishing optically thick and optically thin planetaries. The radii of the central stars and their positions on the H-R diagram are briefly examined.

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