Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...116...80s&link_type=abstract
Astronomy and Astrophysics, vol. 116, no. 1, Dec. 1982, p. 80-88. Research supported by the Fonds National de la Recherche Scie
Astronomy and Astrophysics
Astronomy
Far Ultraviolet Radiation, Planetary Nebulae, Stellar Mass Ejection, Ultraviolet Spectra, Emission Spectra, High Resolution, Iue, Line Spectra, Spaceborne Astronomy, Spectrum Analysis
Scientific paper
Two high-resolution far-UV spectra of the low-excitation planetary nebula HD 138403 are analyzed which were obtained with the IUE satellite over the wavelength range from 1170 to 2070 A. It is shown that the nebula's far-UV spectrum comprises a stellar continuum on which are superimposed a few emission lines, numerous interstellar absorption lines, and various types of P Cygni profiles. Evidence is examined for substantial mass loss from the central nucleus, with terminal velocities of the order of 800 km/s. The observed nebular emissions are used to derive the electron density in the main nebula. The results are taken as supporting the hypothesis that a bipolar structure is expanding around HD 138403 via a selective radiation process involving an edge- or line-locking mechanism or both.
Heck Andre
Surdej Jean
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