Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..847f&link_type=abstract
Astrophysical Journal, Part 1, vol. 236, Mar. 15, 1980, p. 847-853.
Astronomy and Astrophysics
Astrophysics
3
Emission Spectra, Novae, Stellar Spectrophotometry, Stellar Structure, Balmer Series, Iron, Radial Velocity, Stellar Luminosity, Time Lag
Scientific paper
Previous investigations have shown that the phase lags do not increase linearly with time and have inferred that the central object is an anisotropic radiator. The present paper discusses the conditions affecting the emission lines during early portions of the outburst, and shows that it is not possible to uniquely determine the geometry of the continuum-emitting region from time lag measurements alone. It is demonstrated that Balmer-line time lag measurements actually determine the distance to the H(+) ionization front, which expands and contracts to maintain ionization equilibrium, rather than to an average position in the nebula. In addition, measurements of phase lag are further complicated by a large positive velocity gradient across the nebula, as evidenced by differences in the breadths of Balmer and Fe II lines. Finally, it is suggested that these two facts may account for the amplitude-wavelength correlation discovered by Hutchings and McCall.
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