Vibrationally excited HCN transitions in circumstellar envelopes of carbon-rich AGB stars Manali Jeste, Yan Gong, Ka Tat Wong, Karl M. Menten, Tomasz Kamiński and Friedrich Wyrowski A&A, 666 (2022) A69 Published online: 11 October 2022 DOI: 10.1051/0004-6361/202243365