bipolar outflow

A flow of gas from a very young star, forming two oppositely directed beams; it is apparently a common feature of star formation. In the youngest stars the bipolar flow is detected by the radio emission from molecules such as carbon monoxide; when stars have dispersed most of the surrounding gas and dust, the outflow is visible optically as a bipolar nebula or as ‘jets' extending away from a T Tauri star for thousands of astronomical units. Both kinds of outflow can reach speeds of several hundred kilometers per second. The outflow from T Tauri stars can produce a line of Herbig–Haro objects. These flows are too powerful to be driven by the pressure of the star's radiation. They are probably T Tauri winds that are channeled outward from the star's poles, a disk of dense gas around the equator preventing them from escaping isotropically. Such disks are indeed often detected in the centers of the different kinds of bipolar outflow at the correct orientation to account for the observed outflow of less-dense gas.

单词	bipolar outflow
释义	bipolar outflow bipolar outflow A flow of gas from a very young star, forming two oppositely directed beams; it is apparently a common feature of star formation. In the youngest stars the bipolar flow is detected by the radio emission from molecules such as carbon monoxide; when stars have dispersed most of the surrounding gas and dust, the outflow is visible optically as a bipolar nebula or as ‘jets' extending away from a T Tauri star for thousands of astronomical units. Both kinds of outflow can reach speeds of several hundred kilometers per second. The outflow from T Tauri stars can produce a line of Herbig–Haro objects. These flows are too powerful to be driven by the pressure of the star's radiation. They are probably T Tauri winds that are channeled outward from the star's poles, a disk of dense gas around the equator preventing them from escaping isotropically. Such disks are indeed often detected in the centers of the different kinds of bipolar outflow at the correct orientation to account for the observed outflow of less-dense gas.
随便看	wilhelm ceelen wilhelm conrad roentgen wilhelm conrad rontgen wilhelm conrad röntgen wilhelm cuno wilhelm dilthey wilhelm d lambl wilhelm doerpfeld wilhelm dorpfeld wilhelm dörpfeld wilhelm ebstein wilhelm eduard weber wilhelm e weber wilhelm falta wilhelm feldberg wilhelm filchner wilhelm finkeldey wilhelm f kuhne wilhelm florin wilhelm friedrich benedikt hofmeister wilhelm friedrich herschel wilhelm friedrich ludwig wilhelm friedrich ostwald wilhelm friedrich philipp pfeffer wilhelm friedrich von ludwig