Infrared spectroscopy with a contact-type image tube: FU Orionis stars
Spectrograms of FU Ori and the kindred star V1057 Cyg have been obtained at 48- and 168-A/mm dispersion with a single-stage contact image converter and an SI photocathode, mounted on the 50-inch telescope of the Crimean Astrophysical Observatory. In the wavelength bands 7656--8136, 8400--8750, and 10 580--10 900 A, the following lines have been identified in these spectra: Li I, Fe I, Ca II, Si I, C I, O I, H, N I, He I in V1057 Cyg, and Fe I, Ca II, Si I, Ti I, Mg I, O I, H, He I in FU Ori. Between June 1974 and November 1976, changes occurred in the spectrum of V1057 Cyg. Analysis of the spectrograms taken in late 1976 indicates that V1057 Cyg was then of spectral type G7--G8, while FU Ori was type K0. The behavior of the profile of the lambda10 830 He I line suggests that V1057 Cyg has an expanding envelope consisting of several gaseous condensations that are dispersing into space.
- Research Organization:
- Astronomical Institute, Academy of Sciences of the Uzbek SSR, Tashkent
- OSTI ID:
- 5999196
- Journal Information:
- Sov. Astron. AJ (Engl. Transl.); (United States), Vol. 23:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-resolution infrared spectra of FU Orionis variables - Keplerian rotation and mass loss
Photometry of the FU Orionis stars V1057 cygni and V1515 Cygni