A spectroscopic study of the IRAS 05345+3157 bipolar outflow source.

The low-velocity part of the bipolar outflow (LVBO) can be obtained from observation of rotational transitions of ¹³CO molecule lines. Optical depth of ¹³CO molecule lines is about fifty times as small as the optical depth of ¹²CO molecule lines. It allows to calculate parameters of bipolar outflow in the velocity range situated near the centre of line profile. The main problem for determination of LVBO parameters is separation of the bipolar outflow mass and mass of the host cloud. In order to solve this problem the use this method for determination of parameters of low-velocity parts of the bipolar outflow (MLVBO) was proposed. This method is used for calculation of physical parameters low-velocity part of the bipolar outflow in IRAS 05345+3157. This source is known as a high-mass young stellar object. Recently, it has been studied intensively. Its images in many molecular lines have been obtained. Among them there are data concerning bipolar outflow obtained from observations in J=2-1 line of ¹²CO. Our investigation, carried out in J=1-0 line of ¹³CO, contributes to these data.