I can’t see marriage for Hans Magee listed in the Irish civil indexes. However Scottish birth certs contain details of where and when the parents married so if you get Ellen’s birth cert, that should give you the information you are after. Note that Ellen in Ireland often became Helen ion Scotland and vice versa.
I did note the birth of a Hans Magee in Belfast July – Sept 1880 Volume 1, page 214. Could this be one of their children?