Observational analysis reveals red novae remnants' characteristics in post-AGB and pre-PN systems, suggesting relationships.
Red novae are transients powered by collisions of non-compact stars. Among their progenitors are systems of evolved subgiants and giants stars. Remnants of such red novae display bipolar structures which have remarkably close characteristics to many post-AGB or pre-PN systems. It is important to ask (and eventually verify) whether some of the less known post-main-sequence objects (mis-)classified as pre-PNe can be merger remnants similar to the red nova remnants.
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T. Kamiński (2023) studied this question.
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