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Astrophysicists simulate the sounds of stars to show their secrets


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The sound can not be traveled through mere space.

But this does not release the subsonic cell symphony notes, because their nuclear ovens emit complex vibrations. The telescope will notice that the surface of a star changes shine or temperature.

Understand these vibrations, and we can learn more about other ways, from the perspective structure of the starry hidden object.

"A cello looks like a cello for size and shape," says Jacqueline Goldstein, a graduate student at the Wisconsin-Madison Astronomy Department. "Stars vibrations depend on size and structure."

In his work, Goldstein analyzes the relationship between stars' structures and vibrations, developing software that simulates stars and their frequencies. Comparing its simulations with real stars, Goldstein can improve its pattern and astrophysicists can improve the monsters underneath their peak by analyzing subtle sounds.

At times of frequent repetition, vibration of the stars should increase a thousand or a million times faster in human hearing. These reverendations are terribly called Earth by the seismic cousins ​​stars. The field of study is called astroseismology.

As the stars are combined with hydrogen in the heaviest elements of their nuclei, plasma heat shakes and the star shines brightly. These changes can tell the researchers about how to change the structure of a star and how old stars are. Goldstein looks at the stars that are taller than our sun.

"These are exploding and make black holes and neutron stars and all the heavy elements of the universe that make up the planet and, essentially, a new life," says Goldstein. "How they understand how they work and how they affect the evolution of the universe. So, really big questions."

Working with Rich Townsend and Ellen Zweibel astronomy teachers, Goldstein has developed the GYRE program, a star simulation program that connects to the MESA. Using software, Goldstein has built models of different types of stars to see how astronomers may look like their vibrations. Next, check that simulation and reality match.

"Since I've made my stars, I know what I have put them in. So, when I compare vibration patterns compared to the observed vibration patterns, they are identical and large, my inner stars are like their real stars, if they are different, usually what happens, our simulations It provides us with information that needs to be improved and re-tested, "says Goldstein.

Both GYRE and MESA are open source programs, which means that the code for access and change by scientists. Every year, 40 to 50 people take part in a Summer School at the University of California at MESA, how to use the program and improve it. Goldstein and its team recommend that these MESA and their programs modify and consolidate errors.

In addition, other scientists are encouraging: planet-hunters. The brightness of a star can be changed by two things: inner vibrations or a star-shaped planet. The search for planets that are not stars of our planet has made it possible for Goldstein to gain access to new data on changes in surveys conducted by remote stars.

The newest Exoplanet Hunter is a telescope called TESS and lasted into orbit in the last year to investigate 200,000 newest and brightest stars.

"TESS looks at everything in the sky," says Goldstein. "So we can say that we say that all the stars in our neighborhood say, if so, we can explore below them to find out what happens in the skin."

Goldstein is developing a new version of GYRE to take advantage of TESS data. In addition, this star orchestra will start to simulate thousands of powerful ones.

With these simulations, we will be able to get out a bit more about our cosmic neighbors, just by listening.

Scientists show that binary stars reflect each other

Wisconsin-Madison University

Astrophysicists simulate the sounds of the stars to show off their secrets (2019, April 27)
It was acquired on April 27, 2019

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