Laverne Belgian, Lee Indecent, The Journal discussed on SpaceTime with Stuart Gary


Astronomers have discovered that those miss marauding spiral structures sitting planetary nebulae a generated by companion stars or planets orbiting around the dying star. The findings reported in the journal. Science based on an extraordinary set of observations of stellar wins around aging stars when stars like our sun run out of hydrogen for fusion into helium. They begin to contract under their own enormous grafitti as they can track regions around the still a co which still contain hydrogen move closer to the core and the region where pressures and temperatures allow hydrogen fusion to take place. This trick is hydrogen burning in a shell around the corner which causes the stars. Adelaide is dramatically expand and being further away from the core the stars fetters. Fear visible surface is noticeably cooler and consequently looks raider the start now quarter red giant experiences a massive increase in it's still a wind production as more more materials flow out from its gaseous envelope. May well the increase in pressure and temperature in the core eventually trick is what's called a helium flash fusing the core helium into carbon and oxygen stars like the sun. Don't contain enough mass. The fuse carbon and oxygen into heavier elements and so they still revolution ends the core now detached from its outta gas. He's envelope is exposed as a white dwarf slowly cooling over the of time and that attached gaseous envelope is referred to as a planetary nebula. But how do these punditry neighborly get stunning shapes well. The study's authors found that country common consensus stella wins generated by stars including the sun and that's vertical but have shaped similar to that of planetary nebulae. That's because of their interaction with accompanying stars or planets still a wins including the solo in coming from the sun a streams of particles expelled by stars which causes them to lose mass because data observations were lacking. Astronomers have always assumed that these winds were very like the stars they surround. fifth centuries. astronomers are in the dark about the causes. The extraordinary variety of colorful shapes of nebula that had been observed all planetary nebula certain symmetry better almost never round one of the study's authors professor lee indecent from the catholic university in laverne belgian. Wanted to know how round staff could produce the spectacular shape seen planetary neighbourly. Her team observed still a winds around cool red giant stars. Using alma the atacama large millimeter submillimeter array radio telescope in chile. They gathered a lodge detailed collection of observations each made using the exact same method allowing them to directly compare data and exclude biases descended colleagues. Found that still a winds answer metric around it can be disc shaped others can be spirals and yet others are shaped more like cones shapes all very similar to those seen in planetary nebulae. This is a clear indication. That shapes weren't created randomly suggesting that avalon stars or planets to small and dim to be detected directly are orbiting in the vicinity of the dying star causing the different patents. The form decent says these companions are a bit like spoon stirring cream into a cup of coffee and creating a spiral pattern. The companion sucks material towards it as it revolves around the star and shapes the stellar wind and computer models based on their hypothesis is confirmed that the stellar winds were being shaped by companions around the primary star and the rate at which the stars losing mass shooter still. A win is an important parameter. Decent says the new findings mean previous mass loss estimates of votes stars could be wrong by factor of up to ten and that would affect calculations of other crucial characteristics of both stellar and galactic evolution. The study also helps to envision what the sun might look like when it does seven billion years time. Jason says the lodge massive raven satin will influence the son's eventual planetary nebula with initial calculations. Suggesting lended states is a what twelve surrounded by wake spiral structure team international astronomers including quite a lot of my phd students and post. Docs from the kyw leuven. We have made breakthrough discovering stellar evolution. So what about you potentially know that our son not very little yellow star and in roughly five thousand million years from now to send will become a red giant star its size will increase. I factor of two hundred slim nause by factor. Thousands enter to become cooler and our search. It'll change from color from yellow to beds and during that phase we know that stars lose a lot of mass by celebrant now actually off the debt that china face a recession will become a planetary neighbor will die as a very little bite trump now planetary neighbor lie. You potentially have seen furby nice pictures on these these splattering neighbor. I have been enriched by for instance the hubble space telescope and you can see a lot of very complex. Fuji's we have disks. You have bipolar old flows. You have even planetary nebula look like a butterfly but already for more than a century. Astronomers are wondering how can a star soon which is not perfectly into than a billiard bill. how can get this complex phases. We have used the alma telescope in chile two largest radio telescope into roles to look at stellar winds of red china stars. We have seen that each of these winds off rich with thoughts in the past that there are fairly symmetric we have seen each of these swings. Horrors of complexities and that the more full ogies indie stellar rinse resembles are fully cheese. That we've seen the planetary nebulae and this led to the first conclusion that it should be the same physics that's shapes both the celebrants and this planetary neighbor. And thus such that we have called the in action but moreover could use all of this data to make categories in this tolerance morphology and that leads to the second and even most important conclusion that we finally could diagnose the cost of this smartphone cheese. Rethink that each of the stars do not live the life long patasse companion and then you can compare it to the cup of coffee and sawmill. Can you steer and into the with your little spoon can create a spiral structure in your coffee. Well actually the companion assuming the same. It goes volunteer threats giants star and it creates a spiral structure very complex spiral in stellar. Rent it can also create a disk for instance. So what does it imply for our own sun route. Actually our simulations show. That's unlikely our own art will be engulfed by our son. When the sun is a challenge star planets jupiter cancer fife and chip with our for winces will create very weak spiral structure in the stellar. wind of. The son wants giants store. So this research is a breakthrough discovery. Since changes are a few on how stars he falls at the end of the lifetime. That's professor lee. Indecent from the catholic university in laverne belgian and this space time. still the come cape canaveral. Renamed and later in the science report warnings that climate change could lead to irreversible sea level rise s temperatures increase all that and more still to.

Coming up next