  Emission lines in the eV and keV range by certain stellar candidates from
their recent analysis invoke the question of their possible origin. These stars
under consideration, are the 4U 0614+091 (0.65, 0.86, and 1.31 keV), 2S
0918-549 (0.8 keV with width 55 eV), 4U 1543-624 (0.7 keV), 4U 1850-087 (0.7
keV) and 4U 1820-30 (0.6 and 0.9 keV) and also the 0.6 keV excess emission in
RX J170930.2-263927. Recently, it has been suggested that the resonance
absorption at ~ in 0.7, 1.4, 2.1 and 2.8 keV 1E1207-5209 and 0.35, 0.7 and 1.4
keV RX J1856.5-3754 are due to harmonic surface vibrations in strange stars. We
propose that these harmonic vibrations may also responsible for emission lines
in the above mentioned compact stellar candidates.
