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We present long-slit integrated spectroscopy of 238 late-type galaxiesbelonging to the Herschel Reference Survey, a volume limited samplerepresentative of the nearby universe. This sample has a unique legacy valuesince ideally defined for any statistical study of the multifrequencyproperties of galaxies spanning a large range in morphological type andluminosity. The spectroscopic observations cover the spectral range 3600-6900 Aat a resolution R ~ 1000 and are thus suitable for separating the underlyingabsorption from the emission of the Hbeta line as well as the two [NII] linesfrom the Halpha emission. We measure the fluxes and the equivalent widths ofthe strongest emission lines ([OII], Hbeta, [OIII], [NII], Halpha, and [SII]).The data are used to study the distribution of the equivalent width of all theemission lines, of the Balmer decrement C(Hbeta) and of the observed underlyingBalmer absorption under Hbeta in this sample. Combining these new spectroscopicdata with those available at other frequencies, we also study the dependence ofC(Hbeta) and E.W.Hbeta_{abs} on morphological type, stellar mass and stellarsurface density, star formation rate, birthrate parameter and metallicity ingalaxies belonging to different environments (fields vs. Virgo). Thedistribution of the equivalent width of all the emission lines, of C(Hbeta) andE.W.Hbeta_{abs} are systematically different in cluster and field galaxies. TheBalmer decrement increases with stellar mass, stellar surface density,metallicity and star formation rate of the observed galaxies, while it isunexpectedly almost independent from the column density of the atomic andmolecular gas. The dependence of C(Hbeta) on stellar mass is steeper than thatpreviously found in other works. The underlying Balmer absorption does notsignificantly change with any of these physical parameters.

astronomy and astrophysics

Integrated Spectroscopy of the Herschel Reference Survey. The spectral  line properties of a volume-limited, K-band selected sample of nearby  galaxies