Spectral indexes of cool carbon stars in the near-infrared region. III.
Abstract
Following Tanaka et al. (1990) and Tanaka et al. (1992), near-infrared spectroscopic observations of cool carbon stars have been continued with the Fourier transform spectrometer located at the coudé room of the 1.88 m reflector at the Okayama Astrophysical Observatory. Ninety-one spectra of 63 carbon stars were analyzed. Three stars were newly added to the program stars and the total number of the analyzed carbon stars reached 104. Three spectral indexes defined in Tanaka et al. (1990); the color index, the CO-index, and the C2-index were measured. The same analysis was made independently as before because the spectra were taken at different phases of their variabilities and their signal-to-noise ratios were much improved by careful observations. General trends of the results obtained by Tanaka et al. (1990, 1992) are confirmed. Low resolution spectra of the selected 27 carbon stars are presented.
- Publication:
-
Publications of the National Astronomical Observatory of Japan
- Pub Date:
- January 1996
- Bibcode:
- 1996PNAOJ...4..135T
- Keywords:
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- Carbon Stars: Infrared Spectra;
- Carbon Stars: Spectral Indices;
- Carbon Stars;
- Cool Stars;
- Infrared Spectroscopy;
- Near Infrared Radiation;
- Stellar Spectra;
- Spectral Emission;
- Fourier Transformation;
- Astronomical Observatories;
- Indexes;
- Signal To Noise Ratios;
- Astronomy