Dying red giant star

 

Link to article

In this article i found written on phys.org, the author begins by explaining how a team of astronomers began to observe a star named LL Pegasi, and the star right next to it 3,400 light years away from earth, and end up seeing a dying red giant star in vivid detail. This showed the star shedding it’s gaseous bulk in very strong winds. Because of the low massed star’s orbital motion, the mass is being spun around squirting outwards. After looking at the final studies, the astronomers were able to conclude that a highly elliptical orbit is responsible for the shape of the gaseous emissions surrounding it.

This article relates to our class because the article describes how the star dies all the way up to the end. In class, we also did pages 133-134 in our lecture tutorial book that go over stellar evolution, and on page 134 there is a diagram that begins with a Red Giant, that then goes down to either a small mass that produces planetary nebula, or goes down to a large mass that produces type 2 supernova. From the diagram here, planetary nebula goes down to white dwarf which is left behind, and from type 2 supernova, goes down to either a black hole or neutron star that gets left behind.

In class, we also learned all stars start out as clouds of cold molecular gas which eventually collapse into small pieces which then go inward on themselves and become a star. Then the gravity on the stars cause them to start spinning. And a protostar is what determines the lifespan of a star. After about 100 million years of the outer layers of a star being expanded, the core begins to burn out and cause fusion to stop which then will not give energy to the star and it dies.

Overall, i found this article to be fun and interesting because i enjoyed the pictures and videos. I also enjoyed the class time during this study because i found the lecture tutorial pages to be fairly easy to follow along with.

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