Spectrophotometry of cool carbon stars

Details Spectrophotometry of cool carbon stars Spectrophotometry of cool carbon stars

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pasp...89..510g&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 89, Aug.-Sept. 1977, p. 510-518.

Astronomy and Astrophysics

Astronomy

27

Abundance, Carbon Isotopes, Carbon Stars, Oxygen, Stellar Spectrophotometry, Swan Bands, Astronomical Spectroscopy, Carbon Monoxide, Carbon 12, Carbon 13, Cyanides, Molecular Spectra, Stellar Luminosity

Scientific paper

Observations of 75 carbon stars have been made with the Indiana rapid spectrum scanner covering a wavelength range of 5000 A-7000 A at 30-A resolution. The data have been used to form molecular indices for a quantitative measurement of the strength of the C2 Swan system and the shape of the CN red (6, 1) band sequence which is sensitive to the C-12/C-13 isotope ratio. The C2 strength is plotted against the strength of CN and CO; the observed band strengths are found to behave as would be expected from model-atmosphere calculations. Using C/O ratios from Kilston (1975) it is possible to calculate the observed CN/C2 ratio and determine photometric C/O ratios for 61 cool carbon stars. The CN red (6, 1) band photometry shows that only a few (25%) of cool carbon stars have C-12/C-13 isotope ratios significantly lower than the majority of cool carbon stars.

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