Change Data Capture How to Tell which you are running Sync or Asyn

Hi ,
I am taking over a new system that has change data capture running, but Im really confused how this is running. Most of the CDC is set up using Sync(triggers), but I have about 5 tables that DO NOT have system generated triggers on them. I know Streams is NOT running/configured. I know Capture is not running/configured (because nothing in DBA_CAPTURE table). I can tell that these 5 tables are still getting updated in the change table schema. I can not figure out how the 5 tables that DO NOT have triggers on them are updating the change data set tables.
I had thought the the 5 tables, must be configured with HOTLOG, but when I look at the CHANGE_SETS table they all (including these 5 tables) are set to CHANGE SOURCE NAME = SYNC SOUCE. I would expected that to be HOTLOG_SOURCE. So I "assume" they aren't set up using Asnc. hot log mode. So maybe the other Async modes are used, but not pushed to another database? Is that possible?
Any other ideas on how to figure out how the CDC is set up for these 5 tables?
thanks for your help.

Thanks for the reply, but I think I must have not stated the problem clearly. I dont WANT to set the source I want to figure out how this CDC is working. I see ALL the sources are currently set to SYNC_SOURCE. Almost all of the tables are set up with system triggers on them, but 5 dont have system triggers, yet the source says SYNC_SOURCE. I did validate that the change tables are getting updated for these tables. my question is how are they getting updated? I "assume" since they dont have system triggers ont eh table they aren't synchoronus cdc (like the other tables are). yet the source says SYNC_SOURCE. What am I missing? How can I tell if the redo log is populating those changes tables? Im pretty sure it is (Becuase there aren't triggers or jobs running), but Im curious if there is a way to tell for sure.
Thanks,

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