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We present long-slit optical spectra of 12 edge-on low surface brightnessgalaxies (LSBGs) positioned along their major axes. After performing reddeningcorrections for the emission-line fluxes measured from the extracted integratedspectra, we measured the gas-phase metallicities of our LSBG sample using boththe [NII]/Ha and the R_23 diagnostics. Both sets of oxygen abundances show goodagreement with each other, giving a median value of 12 + log(O/H) = 8.26 dex.In the luminosity-metallicity plot, our LSBG sample is consistent with thebehavior of normal galaxies. In the mass-metallicity diagram, our LSBG samplehas lower metallicities for lower stellar mass, similar to normal galaxies. Thestellar masses estimated from z-band luminosities are comparable to those ofprominent spirals. In a plot of the gas mass fraction versus metallicity, ourLSBG sample generally agrees with other samples in the high gas mass fractionspace. Additionally, we have studied stellar populations of 3 LSBGs which haverelatively reliable spectral continua and high signal-to-noise ratios, andqualitatively conclude that they have a potential dearth of stars with ages <1Gyr instead of being dominated by stellar populations with ages >1Gyr.Regarding the chemical evolution of our sample, the LSBG data appear to allowfor up to 30 % metal loss, but we cannot completely rule out the closed-boxmodel. Additionally, we find evidence that our galaxies retain up to about 3times as much of their metals compared with dwarfs, consistent with metalretention being related to galaxy mass. In conclusion, our data support theview that LSBGs are probably just normal disk galaxies continuously extendingto the low end of surface brightness.

Long-slit Spectroscopy of Edge-on Low Surface Brightness Galaxies