Huge rotating stars in the Pleiades cluster

Nearby Pleys Star Cluster Image CFA astronomer Gilmomo Torres completed an 11-year study of the list of medium-sized stars in the cluster using SAO’s Fred El Wipl’s Observatory Tiltinghaust Institute. These stars rotate so fast that in the past the various dimensions of their movements and possessions were unbelievable. Credit: Smithsonian Magazine

The Prussian Star Cluster has been admired by humans for thousands of years, adorning hundreds of stars in the winter sky near the constellation Orion. It is mentioned in the works of the Bible and Greek writers. He is a relatively young star, estimated to be about 100 million years old, which means he was born a long time ago. Jurassic The dinosaurs have gone down in history. The Pleiades cluster is also relatively close, only about 448 light-years away, which is why it is such a spectacular sight and also such a desirable target for astronomers.

The brightest stars in the Pleiades cluster have been studied by observers for over a century. The star constellation not only describes the behavior of a star, but also the position and shapes of the atomic lines to indicate the movements of the stars, the radius of motion in space, and rotation. One of the largest and most spectacular programs of the last century has focused on small-scale stars, leading to the acquisition and behavior of many new binary stars into the cluster.

However, while it is relatively easy to measure the radial velocities of a small mass of stars, the larger ones have smaller lines and the line profiles are much wider because these stars rotate faster and some have excessive rotational velocities. 200 km

As a result, the massive star radial velocities in Plius are generally poor quality. However, over the years there have been more than a dozen or so constellations, and in some cases even temporary orbits have been published, but some of these conclusions have been confirmed.

CFA During his 11-year observation, astronomer Guillermo Torres decided to investigate some unconfirmed claims about these giants. 1.5 m Tinghast Reflection on Mount Hawkins (AZ) at SAO Fred El Wipl Observatory.

The objective of the survey was a complete census of the various binary suspects in the cluster, and this study also examined stellar estimates. The target list consisted of thirty-three fast-moving stars, and further motivation for the task was to obtain accurate and consistent rotation speeds for all fast-moving spheres.

With the exception of one or two, Torres does not confirm anyone’s previous claim of distinction, and overturns all orbital solutions published in binary. He reported that one previous binary actually had a time of 71.8 days, the second binary had an estimated time of 8.7 years, and a new binary with a time of ten years. The study supports the general notion that at least a third of these giant stars are in two or more systems.

REFERENCES: “Observing the fast-moving stars of the Pleiades cluster by observer” by Guillermo Torres, September 25, 2020; Astrophysical Journal.
Doy: 10.3847 / 1538-4357 / abb136

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