قالب وردپرس درنا توس
Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Astrophysicists mimic the sounds of stars to reveal their secrets

Astrophysicists mimic the sounds of stars to reveal their secrets



  stars
Credit: CC0 Public Domain

The sound may not be able to pass through the space vacuum.
But this does not prevent stars from engaging in the symphony of subsonic music, as their kilns are energy-complex vibrations. Telescopes can see these vibrations as fluctuations in brightness or temperature on the star's surface.

Understand these vibrations and we can learn more about the inner structure of a star that is otherwise blindfolded.

The cello sounds like cello because of its size and shape, "says Jacqueline Goldstein, a graduate student at the Astronomy Department at Wisconsin-Madison University. "Vibrations of stars also depend on their size and structure."

In his work, Goldstein studies the relationship between the structure of stars and vibes by developing software simulating a variety of stars and their frequencies. As she compares her simulations with real stars, Goldstein can improve his model and improve how astrophysicists love to look at the surface of stars by exploring their subtle sounds. to accelerate stellar fluctuations by a thousand or a million times to bring them into the range of human hearing. These reverb could be most accurately called the elderly after their seismic relatives on Earth. The field of study is called AstroSemiology.


When stars merge hydrogen into heavier elements in their nuclei, the hot plasma gas vibes and causes flashing stars. These fluctuations can tell the researchers about the structure of the star and how it will change, as the star ages. Goldstein explores stars that are larger than our own sun.

"These are the ones that explode and create black holes and neutron stars and all the heavy elements in the universe that form the planet and, in essence, a new life," Goldstein said. "We want to understand how they work and how they affect the evolution of the universe. So these are really big questions." simulation program MESA. Using this software, Goldstein builds models of different kinds of stars to see how their vibrations may look like astronomers. Then she checks how tight it is modeled and corresponds to reality.

"Since I made my stars, I know that I put them in. Therefore, when I compare my predicted vibration models with the observed vibration models, if they are the same, then the large, the inside of my stars is similar to the interior of these real stars , if they are different, which is usually the case, it gives us information that we need to improve our simulations and tests again, – says Goldstein.

Both GYRE and MESA are open source software, which means that scientists can freely access and modify the code. About 40-50 people annually Goldstein and her team are benefiting from all those who offer changes and bug fixes, both at MESA and in their own program. [2] MESA's Summer School at Santa Barbara, California, is dedicated to learning how to use the program and improve brainstorming. 19659004] They also get an incentive from another group of hunters on the planet. Two things can make the star's fluctuation fluctuate: internal fluctuations or a planet passing through the star. Since the search for exoplanets – planets that revolve around stars besides ours – has increased, Goldstein has been able to access many new data on the fluctuations of stars found in the same studies of distant stars.

A hunter is a telescope called TESS, which went into orbit last year to survey 200,000 brightest, closest stars.

"What TESS does, looks at the whole sky," Goldstein said. "So, we can tell for all the stars that we can see in our neighborhood whether they are throbbing. If they exist, we will be able to explore their ripples to find out what's going on under the surface."

Goldstein is currently developing a new version of GYRE to take advantage of the TESS data, by which it will begin to simulate this magnificent orchestra by hundreds of thousands of mighty ones.

With these simulations, we could take a little bit of our space neighbors by simply listening.


Scientists argue that binary stars reflect light from one another


Available
University of Wisconsin-Madison




Citation :
Astrophysicists mimic the sounds of stars to reveal their secrets (April 2019, April 27)
restored on April 28, 2019
with https://phys.org/news/2019-04-astrophysicists-simulate-stars-reveal-secrets.html

This document is copyrighted. In addition to any honest case for private research or research, there is no
part can be restored without written permission. Content is provided for informational purposes only.


Source link