The IRAS 4A system is part of the southern filament Perseus NGC 1333 molecular cloud. As most star forming regions, known to be heavily shaped by external triggers, such as shock fronts around OB stars or supernovae remnants, cloud-cloud collisions, and instabilities. Recently, it has been hypothesized that entire southwest region 1333, encompassing where lie, due a colliding “turbulent” cell, ...

High-resolution SiO observations of the NGC 1333 IRAS 4A star-forming region showed a highly collimated outflow with a substantial deflection. The deflection was suggested to be caused by the interactions of the outflow and a dense cloud core. To investigate the deflection process of protostellar outflows, we have carried out threedimensional hydrodynamic simulations of the collision of an outf...

INNER-RETINAL COMPONENTS CONTRIBUTE TO THE A-WAVE OF THE ERG OF THE DARK-ADAPTED CAT. Robson J.G.1 and Frishman L.J.2 ’ Physiological Laboratory, Cambridge CE2 3EG UK/ 2 College of Optomern/ UniversitY of Houston, Houston. TX 77204 fUSA/ Purpose To determine the extent to which the initial negative wave and its return to baseline (the a-wave) of the flash electroretinogram IERG) can be modelled...

This paper presents the third in a series of single-dish studies of molecular abundances in the envelopes around a large sample of 18 low-mass pre-and protostellar objects. It focuses on typical grain mantle products and organic molecules, including H 2 CO, CH 3 OH and CH 3 CN. With a few exceptions, all H 2 CO lines can be fit by constant abundances of 7×10 −11 – 8×10 −9 throughout the envelop...