IRAS colors of carbon stars - an optical spectroscopic test

Details IRAS colors of carbon stars - an optical spectroscopic test IRAS colors of carbon stars - an optical spectroscopic test

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1759c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, June 1989, p. 1759-1762.

Astronomy and Astrophysics

Astronomy

12

Carbon Stars, Infrared Astronomy Satellite, Infrared Spectroscopy, Stellar Color, Visible Spectrum, Asymptotic Giant Branch Stars, Color-Color Diagram, M Stars

Scientific paper

Optical spectra are obtained of 57 photographic counterparts to IRAS sources not previously studied spectroscopically, and expected on the basis of their IRAS colors to be M or C type stars. Confirmed carbon stars are found only in a restricted range of 12-25 index, and constitute a striking 'vertical' sequence in the 12-25-60 micron color-color diagram. This sequence is in accord with evolutionary models for AGB stars that convert M into C stars by dredge-up, and follow loops in the color-color plane. Optically visible and optically invisible carbon stars occupy different color-color locations consistent with their representations of different evolutionary states in the life of relatively low-mass stars.

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