Chandra registered young stars without protoplanetary discs

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Three-color shot taken by the Spitzer telescope / © NASA / Spitzer
The Serpens South star cluster, located about 900 light-years from Earth in the direction of the constellation Snake, is very young, its stars are hidden under thick dust. It is believed that this is one of the youngest regions near us, which makes it an important testing ground for studying the evolution of disks in clusters.

Astronomers from Harvard-Smithsonian Center for Astrophysics Elaine Winston and Scott Walk used data from Chandra and Spitzer to analyze 66 young cluster stars in infrared and X-ray spectra. They found five stars that did not have discs, which, apparently, were already middle-aged, since they did not have a signature. But X-ray radiation has shown that they are still quite young: scattering of their disks is the result of not clustering, but cluster interactions, which corresponds to the theory.

The team also resolved a long-standing dispute about the distance to the cluster. Many astronomers assumed that it was located as much as three thousand light-years from us – about the same distance as another cluster in the same region of the sky. It is known that the fine X-ray emission of young stars in clusters follows a narrow distribution of values, and the observed X-ray emission from these stars refutes the assumption of a large distance and inclines the scales in favor of 900 light years.

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