I found a bizarre open-access, peer-review journal of STEM research. It was hard for me to find anything that pertained to astronomy or any of the stellar studies, but I did find a couple categories I could investigate:
Astrobiology
Astronomical Sciences
Spectroscopy (I didn’t see any astronomical spectroscopy stuff but who knows)
Just looking at the articles popping up suggests that it would take some serious digging to find anything (and I would certainly have to work on my keyword optimization techniques because typing ‘space’ into the search bar got me nothing relevant to my interests), but it’s a new potential resource! And for anyone who wants to find a way to publish in STEM fields, maybe it’s something worth checking out?