Abstract
Detections of extragalactic (HCN)-N-15 are reported from the Large Magellanic Cloud (LMC) and the core of the (post-) starburst galaxy NGC 4945. The LMC data from the massive star-forming region N113 directly infer N-14/N-15 = 114 +/- 14. For the LMC star-forming region N159 and for the central region of NGC 4945, the use of a 'reasonable' carbon isotope ratio (of order 50) also yields N-14\N-15 similar to 100. These ratios are smaller than all interstellar nitrogen isotope ratios measured in the disk and center of the Milky Way, strongly supporting the idea that N-15 is synthesized by massive stars. Although contradicting standard stellar evolution and nucleosynthesis calculations, this supports recent findings of abundant N-15 production caused by rotationally induced mixing of protons into the helium burning shells of massive stars.