Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..744r&link_type=abstract
Astrophysical Journal, Part 1, vol. 243, Feb. 1, 1981, p. 744-755. Research supported by the Natural Sciences and Engineering R
Astronomy and Astrophysics
Astrophysics
94
Carbon Stars, Magellanic Clouds, Stellar Luminosity, Stellar Spectrophotometry, Electrophotometers, Hertzsprung-Russell Diagram, Statistical Analysis, Stellar Mass Ejection, Stellar Spectra
Scientific paper
Photometric and spectroscopic observations of a complete sample of 71 cool carbon stars found in the western edge of the bar of the Large Magellanic Cloud are presented. Colors in the Johnson VRI system obtained photoelectrically are found to be similar to those of carbon stars observed in incomplete galactic and Small Magellanic Cloud samples, although the data suggest that the SMC stars may be a few tenths of a magnitude brighter if the difference in distance moduli of the two galaxies is 0.5 mag. A bolometric magnitude/log temperature diagram derived for the LMC carbon stars confirms that they tend to lie in an evolutionary state subsequent to the onset of helium shell flashes in asymptotic branch stars. Spectra obtained in the wavelength region 5000-7000 A for 25 of the sample stars confirm the carbon star classifications in all but possibly one case. The surface density of carbon stars in the field is found to be at least a factor of 10 greater than that in the Galaxy, possibly representing the end product of a burst of star formation 3-5 billion years ago. The core mass-luminosity relation for double shell source stars suggests a range in core masses of 0.56-0.81 solar masses, and estimates of carbon star lifetimes and mass-loss rates obtained indicate that all stars in the mass range 1.2-2 solar masses evolve through the carbon star phase.
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