Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979crasb.288..191f&link_type=abstract
Academie des Sciences (Paris), Comptes Rendus, Serie B - Sciences Physiques, vol. 288, no. 12, Mar. 26, 1979, p. 191-196. In Fr
Astronomy and Astrophysics
Astronomy
2
Absorption Spectra, Cygnus Constellation, Line Spectra, Novae, Stellar Spectra, Ultraviolet Spectra, Astronomical Spectroscopy, Balmer Series, Brightness, Calcium, H Lines, Iron, Magnesium, Radial Velocity, Silicon, Supergiant Stars, Titanium
Scientific paper
Spectra in the range 4870 to 3600 A of Nova Cygni 1978 taken on the four nights surrounding and during the time of its maximal brightness are presented. Spectra obtained approximately two days before maximum resemble those of a supergiant star of spectral type A5, with a well developed Balmer series from H beta to H 18 and spectral lines corresponding to Ca(plus), Mg(plus), Ti(plus), Fe(plus), Cr(plus) and Si(plus). Absorption lines indicate a velocity of -570 km/sec, and a radial velocity of -17.0. Spectra taken twenty hours later exhibit a marked increase in the number and intensity of the absorption lines, with Sc(plus), Sr(plus) and neutral Fe, Mg and Ca lines appearing, corresponding to a spectral type of Fo Ib. The spectrum continued to evolve rapidly in the following days, and an increase in velocity to -680 km/sec was noted.
Andrillat Yvette
Fehrenbach Ch.
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