The jet of BP Tau

Abstract

A strong global magnetic field of young low-mass stars and a high accretion rate are the necessary conditions for the formation of collimated outflows (jets) from these objects. But it is still unclear whether these conditions are also sufficient. We aim to check whether BP Tau, an actively accreting young star with a strong magnetic field, has a jet. We carried out narrowband S ii 672 nm imaging and spectroscopic observations of BP Tau and its vicinity. We find that BP Tau is a source of a Herbig-Haro flow (assigned number HH\,1181), which includes two HH objects moving from the star in opposite directions and a micro- (counter-) jet of $ projected length. The flow is oriented along position angle $59