Weak-CN features in red supergiants across the LMC, M33, and M31 are the expected molecular-equilibrium signature of ordinary cool RSGs rather than an exotic carbon-star intermediate.
M., Massey, P., Olsen, K
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Weak-CN Stars Are Ordinary Cool Red Supergiants
Weak-CN features in red supergiants across the LMC, M33, and M31 are the expected molecular-equilibrium signature of ordinary cool RSGs rather than an exotic carbon-star intermediate.