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NASA Tess allows scientists to investigate the mysterious pulsation of delta Scuti stars

via:cnBeta.COM     time:2020/5/15 8:00:28     readed:717

NASA are studying the mysterious pulsations of a star called Delta Scuti, using the transcontinental exoplanet survey satellite (TESS), foreign media reported. Astronomers have used TESS to detect pulsating patterns in dozens of young, rapidly rotating stars. Astronomers believe the discovery will help revolutionize their ability to study the details of star age, size and composition. And these stars are named after the first of their kind -- Delta Scuti..

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Delta Scuti stars vibrate in interesting ways, and their patterns have challenged scientists' understanding. "To use music as a metaphor, many stars move along simple chords, but Delta Scuti stars are very complex, and their notes seem disordered," said Tim bedding, Professor of astronomy at the University of Sydney. Tess has told us that not all of them are like this. "

Scientists are using techniques that some geologists use to understand the results of the earth's interior during the study of seismic waves. They applied the same principle to the interior of stars and studied the pulsation of stars in a field called astroseismology. Sound waves can travel through the interior of a star at a rate that varies with depth. On the surface of a star, waves combine with pulsating patterns.

Astronomers can detect these patterns to understand tiny fluctuations in brightness and use them to determine the age, temperature, composition, internal structure, and other properties of stars. Delta Scuti stars are 1.5 to 2.5 times the mass of the sun, and their namesake stars are in the southern Scutum constellation, visible to the naked eye.

Usually, it is difficult for scientists to explain the pulsation of stars. Stars rotate once or twice a day, at least a dozen times faster than the sun. Tess can monitor large areas of space for 27 consecutive days and take photos with four cameras every 30 minutes. However, because the exposure speed is too slow to capture the pulse every 30 minutes, Tess will take Delta Scuti images every two minutes to capture the changes. Through these images, scientists found a subset of delta Scuti, which has regular pulsating patterns.

After knowing what to look for, the researchers looked for other examples in Kepler's data, and finally identified 60 Delta Scuti stars with clear patterns. The breakthrough allowed scientists to understand the star and compare it to a model they had never been able to do before.

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