What can be learned by measuring the fluxes of the 7 Be and the pep solar neutrino lines

Measurements of the interaction rates of the solar neutrino lines of {sup 7}Be and pep can be used, independent of solar models, to test whether electron flavor is conserved, to determine survival probabilities of electron-type neutrinos at specific energies, and to test for the existence of sterile neutrinos. We present analytic descriptions of these tests. We also illustrate by numerical simulations, assuming matter-enhanced and vacuum neutrino oscillations, what measurements of solar neutrino lines can teach us about neutrino masses and mixing angles. {copyright} {ital 1997} {ital The American Physical Society}