An international team of scientists, led by the Spanish Carlos Carrasco-Gonzalez, has “persecuted” for 18 years to a massive star and achieved real-time observation of the early stages of their evolution.
Although the process lasts star formation hundreds of thousands of years, researchers have managed to capture the gestation of a supersonic gas jet , also known as “jet”.
To do this, they used two images taken by the telescope Vary Large Array (VLA) in 1996 and 2014, plus information from many observations obtained for 18 years.
The examined region is known as W75N and what led between 1996 and 1999 to José María Torrelles, Guillem Anglada and José Francisco Gómez (CSIC and signatories of this paper) to study was that it contained many massive star formation.
Other things, found that the star W75N (B) -VLA2 behaved very peculiar , with a wind bit collimated (the material away from the star in many directions), while those already known or the others were in the same region had very collimated winds (the material goes in one direction).
Years later, Carrasco-Gonzalez, now in the National Autonomous University of Mexico in Morelia, also began to study that area interested in the stars with wind, “and there it was again VLA2, still evolving very strangely,” he told Efe.
In 2013, researchers decided to pool data on VLA2 and further observations.
So, they concluded, as is now described in the journal Science, which W75N (B) -VLA2, located 4,200 light-years from Earth, has changed drastically how material ejected, from substantially spherical do so to adopt an elongated shape, with concentrated along one direction of ejection.
Current theories predict that young stars must expel matter form of collimated jets (in one direction).
Guillem Anglada, the Institute of Astrophysics of Andalusia, explained, however, that previous studies had found that some very young massive stars spend by brief episodes where ejected matter in all directions, according to the CSIC.
“We suspected that at some point the transition should occur at the stage of collimation . This transition is precisely what we are witnessing in W75N (B) -VLA2 “.
To Carrasco, this work helps to understand how stars form and in particular how the most massive stars form than our Sun. .
The stars are initially formed as balls of very low-mass gas (much less massive than our Sun) and will grow by incorporating material from its surroundings.
“One of the most important things we learned is that a fundamental aspect is the collimated winds. The stars need for disc material can fall on them, “said Carrasco.
” Understanding how the winds work gives us important information about how stars and planets form. “
EFE
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Posted by RPP News on Thursday, April 2, 2015
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