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IRAS colors of carbon stars - An optical spectroscopic test (1989)

Walker, Helen J. ; Schwartz, Deborah E. ; Wainscoat, Richard J. ; [et al.]

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Publication Date: 2019-07-12

Description: 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.

Keywords: ASTROPHYSICS

Type: Astronomical Journal (ISSN 0004-6256); 97; 1759-176

Format: text

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