In my experience writing for magazines they usually purchase publication rights to the article and copyright in exchange for a modest payment. Sometimes, there will be a smaller similar payment if the article is reused. Some magazines may handle it differently, but the copyright if originally transferred to the magazine, probably follows whatever disposition of the magazine's assets takes place. Old magazines routinely go away, so I don't know how this usually plays out. In general the subscriber list is consider a more valuable asset than old articles. but somebody ends up owning them. I am not aware of any reversion to authors upon abandonment. In patent law, if a patent is abandoned it reverts to public domain, but AFAIK copyrights don't have maintenace fees like patents.
I ASSume if the article is posted with original copyright credits and credible efforts are made to secure permissions, one should be OK, but I am not a lawyer so caveat lector.
JR
I ASSume if the article is posted with original copyright credits and credible efforts are made to secure permissions, one should be OK, but I am not a lawyer so caveat lector.
JR