Indication of Outflows from Young Stars in the Serpens Molecular Cloud

The extended infrared emission in the Serpens molecular cloud is associated with three B stars, HD 170634, 170739 and 170784. The dust heating is due to a central stellar and an external interstellar radiation field. The Serpens extended emission exhibits apparent small-scale cavities immediately around the three stars. With the assumption that the cavities have been excavated by stellar winds, mass loss ratesfor these stars may be estimated within the range of 10-13 – 10-11 M⊙ yr-1. The IR emission from the core of the cloud has a double-peaked morphology, the grains is mainly heated by ultraviolet photons produced by shock waves.