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CAB Home » Radio astronomy » News » Publications - IRAS 21391+5802: Study of Intermediate-Mass Protostars
IRAS 21391+5802: Study of Intermediate-Mass Protostars

Beltran, Maria T.; Girart, Jose M.; Estalella, Robert; Ho, Paul T.; Palau, Aina

We present centimeter and millimeter interferometric observations of gas and dust around IRAS 21391+5802 an intermediate-mass Class 0 source embedded in the core of IC 1396N. The continuum emission from 3.6 cm to 1.2 mm has been resolved into three sources separated ~15'' and with one of them BIMA 2 associated with IRAS 21391+5802. The dust emission around this source shows a very extended envelope which accounts for most of the circumstellar mass of 5.1 Msun. BIMA 2 is powering a strong CO molecular outflow that presents a complex structure and kinematics: at high outflow velocities the outflow is clearly bipolar while at low outflow velocities the blueshifted and redshifted emission are highly overlapping and the emission shows a V-shaped morphology. The outflow as traced by CS and CH3OH exhibits two well differentiated and clumpy lobes with two prominent clumps. Morphological kinematical and chemical evidences suggest that the clumps are tracing gas entrained within the surface of interaction between the molecular outflow and the dense ambient quiescent core and that the morphology of the outflow is a result of this interaction. BIMA 2 fits very well correlations between source and outflow properties found for low-mass Class 0 counterparts.

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