Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978azh....55..531a&link_type=abstract
Astronomicheskii Zhurnal, vol. 55, May-June 1978, p. 531-539. In Russian.
Astronomy and Astrophysics
Astronomy
Absorption Spectra, Astronomical Spectroscopy, Novae, Stellar Spectra, H Lines, Radial Velocity
Scientific paper
The evolution of the premaximum and principal absorption spectra of HR Del is discussed on the basis of previously published data and spectrograms examined in this paper. It is found that the principal spectrum appeared a few days before maximum light - not 85 or 125 days before, as reported by Malakpur (1973, 1974) - and that the only regular spectral-line component observed during the premaximum stage was that produced by continuous outflow of matter from the star's surface (i.e., the premaximum spectrum). In addition, rather intense and short-lived line components produced by eruptive mass ejection from the star were observed from time to time. It is concluded that Nova Delphini 1967 was a 'normal' nova in terms of the behavior of the various absorption line systems and that this nova is distinguished by its unusually long premaximum period.
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