Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979sva....23..158s&link_type=abstract
Astronomicheskii Zhurnal, vol. 56, Mar.-Apr. 1979, p. 288-296. In Russian.
Astronomy and Astrophysics
Astronomy
2
Image Converters, Infrared Spectroscopy, Stellar Spectrophotometry, T Tauri Stars, Absorption Spectra, Astronomical Spectroscopy, Helium, Line Spectra, Photocathodes, Spectrograms, Stellar Evolution, Tables (Data), Variable Stars
Scientific paper
Slit spectrograms of the FU Ori stars FU Ori and V1057 Cyg are examined which were obtained in the wavelength region from 7656 to 10,900 A with dispersions of 48 and 168 A/mm by using a single-cascade contact image convertor attached to a 125-cm telescope. The following spectral lines are identified in the wavelength regions from 7656 to 8136 A, 8400 to 8750 A, and 10,580 to 10,900 A: for V1057 Cyg, Li I, Fe I, Ca II, S I, C I, O I, H, and He I; for FU Ori, Fe I, Ca II, Si I, Ti I, Mg I, O I, H, and He I. Changes in the spectral properties of V1057 Cyg were observed in the period from June 1974 to November 1976. Spectrograms obtained at the end of 1976 indicate that V1057 Cyg was of spectral type G7-G8, while FU Ori was of type K0. From the observations of the He I 10,830-A line profile, it is concluded that V1057 Cyg has an expanding shell consisting of several escaping gas condensations.
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