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We report Mo isotopic data of 27 new presolar SiC grains, including 1214N-rich AB (14N/15N>440, AB2) and 15 mainstream (MS) grains, and theircorrelated Sr and Ba isotope ratios when available. Direct comparison of thedata for the MS grains, which came from low-mass asymptotic giant branch (AGB)stars with large s-process isotope enhancements, with the AB2 grain datademonstrates that AB2 grains show near-solar isotopic compositions and lacks-process enhancements. The near-normal Sr, Mo, and Ba isotopic compositions ofAB2 grains clearly exclude born-again AGB stars, where the intermediateneutron-capture process (i-process) takes place, as their stellar source. Onthe other hand, low-mass CO novae, and early R- and J-type carbon stars show13C and 14N excesses but no s-process enhancements and are thus potentialstellar sources of AB2 grains. Since both early R-type carbon stars and COnovae are rare objects, the abundant J-type carbon stars (10-15% of all carbonstars) are thus likely to be a dominant source of AB2 grains.

J-type carbon stars: A dominant source of 14N-rich presolar SiC grains of type AB