At the beginning of Avengers: Infinity War, we see the Asgardian's refugee ship filled with
the bodies of the survivors of Thor: Ragnarok. The children of Thanos can be seen going around stabbing the bodies, implying that not all of them have died. Thor, Loki, Hulk, and Heimdall all are still alive, but are incapacitated to some extent (Heimdall in particular is lying wounded on the floor). It's clear that the attack on the refugee ship by Thanos has left nearly everyone who stood in his way dead or incapacitated.
Further on we see the refugee ship completely destroyed, leaving Thor floating in space to be rescued later by the Guardians of the Galaxy. When Thor is finally rescued, he makes no plea to his rescuers to search the area for survivors. Therefor, Thor must either not care for the others aboard the ship or must have known he was the only one who could have survived the destruction of the ship and the subsequent float through the vacuum of space.
So to answer your question:
The Asgardians aboard the ship are dead. Korg and Miek are most likely dead too, unless they left the ship through some other means before the attack.