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The protostar B335 was observed in the 1.3 mm continuum and in the H2CO 312 -211 line with an angular resolution of about 8 arcsec. The mass of the innerenvelope detected by the dust continuum emission is about 0.02 Msun. The H2COspectrum at the protostellar position shows a blue-skewed double peak profile,suggesting that the kinematics of the inner envelope is dominated by infallmotion. When the blueshifted and the redshifted peaks were imaged separately,however, there is a small east-west displacement between the maximum positions.This displacement suggests that some part of the H2CO emission might come fromthe outflowing gas. A combined effect of the infalling envelope and the outflowon the radiative transfer is discussed. This effect can make the line profileasymmetry severer than what is expected from infall-only models.

Observations of B335 in the Millimeter Continuum and the 226 GHz H2CO Line