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The dipping low-mass X-ray binary 4U 1915-05 was observed by Suzaku on 2007November 8 for a net exposure of 39 ksec. It was detected by the XIS with a0.8-10 keV signal rate of 9.84+\-0.01 cts/s per camera, and HXD-PIN with a12-45 keV signal rate of 0.29+/-0.01 cts/s. After removing the periodic dipsand an X-ray burst, the 0.8 - 45 keV continuum was successfully described by anoptically thick disk emission with an inner-disk temperature ~ 0.7 keV and aneutron-star blackbody emission with a temperature ~ 1.3 keV, on condition thatthe blackbody component, or possibly the disk emission too, is significantlyComptonized. This successful modeling is consistent with 4U 1915-05 being in ahigh-soft state in this observation, and implies that its broadband spectrumcan be interpreted in the same scheme as for many non-dipping Low-mass X-raybinaries in the soft state. Its bolometric luminosity (~ 0.02 times theEddington limit) is relatively low for the soft state, but within a tolerance,if considering the distance and inclination uncertainties. As ahigh-inclination binary, this source exhibited stronger Comptonization effect,with a larger Comptonizing y-parameter, compared to low and medium inclinationbinaries. This suggests that the Comptonizing coronae of these objects in thesoft state is in an oblate (rather than spherical) shape, extending along theaccretion disk plane, because the y-parameter would not depend on theinclination if the corona were spherical.

Probing the Accretion Scheme of the Dipping X-ray Binary 4U 1915-05 with Suzaku