R. Lyons and C. T. Bolton, David Dunlop Observatory, communicate: "A spectrogram (dispersion 0.8 nm/mm) obtained of this object on Dec. 30.96 UT shows a spectrum typical of a nova shortly after maximum light. The Balmer and Ca II lines are present in emission, and a complex blend of Fe II and Ti II (?) emission is seen between 448 and 460 nm with weaker emission elsewhere in the spectrum. The measured absorption line velocities are -630 km/s for Fe II and Ti II, -670 km/s for H, and -720 km/s for Ca II. The latter two sets of lines also had absorption components at -1390 km/s. The absorption lines are relatively narrow, and there are very strong interstellar Ca II lines at -7 km/s. A 1.2-nm/mm spectrogram obtained on Jan. 8.97 shows only a slight weakening of the lower velocity absorption components, but Fe II and Ti II lines have shifted to -650 km/s, and the Balmer and Ca II lines are at -750 km/s." E. A. Harlan and G. H. Herbig, Lick Observatory, write that a 75-A/mm spectrogram of the blue-violet region obtained on 1984 Dec. 28.1 UT shows a prominent pre-maximum absorption spectrum of type F2, luminosity class I, together with moderately strong emission bands of H and Fe II. The F2 spectrum and the absorption fringes on the emission lines have a displacement of ~ 650 km/s. Another set of absorption components at -1300 km/s is present at the Balmer lines. Further selected visual magnitude estimates: Jan. 11.04 UT, 6.5 (P. Maley, Houston, TX); 13.816, 6.5 (K. Medway, Southampton, England).
International Astronomical Union Circular
- Pub Date:
- January 1985