Intrinsic properties of carbon stars. II - Spectra, colours, and HR diagram of cool carbon stars

Details Intrinsic properties of carbon stars. II - Spectra, colours, and HR diagram of cool carbon stars Intrinsic properties of carbon stars. II - Spectra, colours, and HR diagram of cool carbon stars

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981japa....2..253t&link_type=abstract

Journal of Astrophysics and Astronomy, vol. 2, Sept. 1981, p. 253-276.

Astronomy and Astrophysics

Astrophysics

26

Carbon Stars, Hertzsprung-Russell Diagram, Stellar Evolution, Stellar Spectra, Stellar Temperature, Interstellar Extinction, Irregular Variable Stars, Molecular Spectra, Red Giant Stars, Stellar Luminosity, Stellar Models, Stellar Spectrophotometry

Scientific paper

The spectroscopic properties of cool carbon stars are examined, based on a recently-proposed effective temperature scale (Tsuji, 1981). Various photometric indices of cool carbon stars are found to be well correlated with the new effective temperatures. Color index-effective temperature calibrations for carbon stars are different from those for K-M giant stars. Based on the fact that the intrinsic (R-I)0 color is nearly the same for N-irregular variables, in spite of a considerable spread in effective temperature, the interstellar reddening of carbon stars is estimated. An observational HR diagram of red giant stars, including carbon and K-M stars, is obtained on the basis of the color index-effective temperature calibrations and the best estimations of luminosity. It is shown that carbon stars and M giant stars are sharply divided in the HR diagram by a nearly vertical line at an effective temperature of 3200 K, and that the carbon stars occupy the upper right region of M giant stars.

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