About 20% of 727 hot subdwarf stars observed by LAMOST show calcium absorption and reddening excesses that the authors attribute to long-lived circumstellar matter ejected during a common-envelope phase.
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Detection of Ubiquitous Circumbinary Matter in Hot Subdwarfs Formed from Common-Envelope Ejections
About 20% of 727 hot subdwarf stars observed by LAMOST show calcium absorption and reddening excesses that the authors attribute to long-lived circumstellar matter ejected during a common-envelope phase.