NASA’s TESS Space Telescope has helped astronomers launch a ground-breaking study that has helped unlock the secrets of the star’s strange pulsation, paving the way for astronomers to better understand their age and what’s happening beneath their turbulent surface,media reported. It is understood that Delta Scuti stars are one of many stars in the universe, but they are also one of the most confusing stars — because they bounce in strange sequences.
Many stars have pulsations, but they usually perform in a predictable, direct pattern. However, the Delta Scuti star is not the case, it is very chaotic, its hemisphere expansion and contraction will take on a state of out-of-sync, their shape is also expanding and shrinking.
This is enough to prevent traditional methods of measurement of the interior of stars from being tested. Typically, astronomers rely on so-called star-setography, which relies on the fact that sound waves are affected by different densities or even more as they pass through the star’s interior. Through fluctuations in the brightness of the star’s surface — though small– it can still be used to determine age, temperature, composition, and internal structure. That is, it does not apply to stars that have vague pulsating patterns.
It is understood that the first Delta Scuti star was discovered in 1900 and is visible to the naked eye. Since then, thousands more have been discovered, many of them by NASA’s Kepler Space Telescope.
Delta Scuti star factor factors become particularly difficult to assess. First, despite their sheer size — 1.5 to 2.5 times the mass of our sun — they rotate fast. It is understood that they rotate once or twice a day and are at least 12 times faster than the sun. This is enough to allow the star to flatten slightly at the poles, disrupting the pulsation pattern.
To discover a pattern, astronomers need to make consistent measurements of stars over a period of time. The problem is, this didn’t happen at Delta Scuti at all. Although the Exoplanet Survey Satellite (TESS) takes a complete picture every 30 minutes, it is not frequent enough to allow Delta Scuti’s star to change every minute.
But through other tesS photos — taking pictures of thousands of stars every two minutes — a team led by Professor Tim Bedings of the University of Sydney’s Astronomy Institute found some Delta Scuti stars and showed regular pulsation patterns. In response, they published a paper on their new findings.
“Once they know what to look for, they look for other examples from the Kepler data, which uses a similar observation strategy,” NASA explained. They also made follow-up observations with land-based telescopes, one at the W.M. Keck Observatory in Hawaii and the other two at the global Las Cambres Observatory network. In all, they found a total of 60 delta moths with clear patterns. “
However, even with these new data, these strange stars are still difficult to classify. The so-called “good-looking” Delta Scuti star actually has two distinct ways of behaving: one is to see the entire star expand and contract symmetrically, and the other to see the star expand and contract alternately relative to the hemisphere.
Beyond that, however, other Delta Scuti stars do not have such a pattern. The researchers believe this is due to age: younger stars exhibit greater regularity, but their pulsationbecome becomes more diffuse as they age.