Roberta M. Humphreys
Published 2019-11-05Version 1
The broad-band colors of the progenitor of the black hole candidate in NGC 6946 suggest that it was a yellow hypergiant on a post-red supergiant track when the core collapse occurred.
Comments: Shorter version published in Research Notes of the AAS
Journal: RNAAS, vol. 3, number 10, 2019
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