Science

Scientists make sense of pulsating stars using NASA's TESS satellite

Scientists make sense of pulsating stars using NASA's TESS satellite”

Recently, NASA's planet-hunting space telescope succeeded in taking a look at what happens inside.

This data enabled them to study regular changes in brightness in the group of stars.

Another report by the geologists studying the seismic waves of the earthquakes found that the internal structure from the way the reverberations have a tendency to change the speed and direction as they were travelled through it.

Delta Scuti stars are between 1.5 and 2.5 times the Sun's mass.

Delta Scuti stars rotate once or twice a day, which is much quicker, and about a dozen times faster, than our sun. Also, the small changes are linked to oscillations and pulsations in the core of the star.

To determine if order exists in Delta Scuti stars' apparently chaotic pulsations, astronomers needed to observe a large set of stars multiple times with rapid sampling. Scientists used data from the TESS space telescope used to find exoplanets around the closest to the Earth stars.

The team has indicated that they believe the 60 stars they observed were of the younger variety because they were able to produce much clearer patterns than older Delta Scuti stars, which have a habit of not emitting pulses as frequently.
The patterns detected allow officials to specifically note a star's age, temperature and composition, among other aspects. They also conducted follow-up observations with ground-based telescopes, including one at the W.M. Keck Observatory in Hawaii and two in the global Las Cumbres Observatory network.

It is for the first time that such systematic patterns could be identified in a significant number of stars.

"This really is a breakthrough".

Journey to the interior of the stars "asteroseismology is the method that we use to reveal the interior of a star", he said in a statement Batch Li, co-author of the study and researcher at the University of Birmingham. "It's going to allow us to measure these stars using asteroseismology in a way that we've never been able to do".

"The delta Scuti stars had perplexed us until now". Some occur as the whole star expands and contracts symmetrically.

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The TESS mission, which was created to detect exoplanets, or planets outside of our solar system, around nearby stars, captures data about star brightness.

According to lead author of the study Prof. This has now finally cleared up the picture, and we were able to identify regular structures.

"Young stars like these are among the most intriguing and important objects in astronomy", said Gaidos. The pulsations occur more rapidly in the fledgling stars. They do this by studying stellar pulsations using precise measurements of changes in light output.

Another factor may be TESS's viewing angle.

That means they are a bit squashed or egg-shaped, which may affect our view of them.

Scientists will continue to develop their models as TESS begins taking full images every 10 minutes instead of every half hour in July. "Now we can detect structure, more like listening to nice chords being played on the piano", Bedding said.

'Stars are like a musical instrument, ' Bedding told ABC News.

For its primary mission that lasted two years, TESS was expected to find over 20,000 transiting exoplanets.

"Very Regular High-Frequency Pulsation Modes in Young Intermediate-Mass Stars", Timothy Bedding et al., 2020 May 13, Nature [available at https://www.nature.com/articles/s41586-020-2226-8].

The Transiting Exoplanet Survey Satellite (TESS) belongs to NASA's Explorers program. Mostly, she will please our readers with space-related topics, but she will also post articles on the Apple universe, from now and then - Just another type of Universe.



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