Spectrographic study of Nova Cygni 1978 (V1668 CYG) |
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| Authors: | Liu Zong-li Hao Xiang-liang Li You-gang Mei Bao |
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| Institution: | Beijing Observatory, Academia Sinica, China |
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| Abstract: | Nova Cygni 1978 was observed from October 11 to December 23, 1978 at the Beijing Observatory with the grating spectrograph attached to the Naismith focus of the
Schmidt telescope. This paper gives postmaximum photographic magnitudes, identification of the spectral features, emission line structures, intensity ratios of some emission lines and the temperature of the underlying star.The main spectral lines in wavelength range
from October 11 to 30 are those of the following atoms or ions: H, FeII, NII, TiII, 0I], NIII. From November 10, lines of 0III], HeI and Hell become visible one after the other. The emission line Hα shows three components of which the most redshifted is the strongest. In turn, each component is split into a number of secondary peaks. Temperature of the underlying star increases with decline of the nova brightness. The upper limit of temperature may be 120000 K. |
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