CAII H and K Spectroscopy of Er-Vulpeculae Fernández-Figueroa, M. J. ; Armentia, J. E. ; de Castro, E. ; Cornide, M. ; Reglero, V. Abstract Publication: IAU Colloq. 130: The Sun and Cool Stars. Activity, Magnetism, Dynamos Pub Date: 1991 DOI: 10.1007/3-540-53955-7_185 Bibcode: 1991LNP...380..483F