Astronomers from the Institute of Science and Technology Austria have identified what they believe constitutes a new class of stars based on two stellar merger remnants with shared characteristics. The research, published in Astronomy & Astrophysics with a preprint available on arXiv, describes these objects as isolated stellar remnants that exhibit X-ray emission among other common properties.
The two stellar remnants share five distinct properties that distinguish them from other known stellar objects. Most notably, both objects emit X-rays despite being isolated, meaning they are not part of binary systems where material transfer typically drives such emissions. The specific technical details of the other four shared properties were not detailed in the available source material.
The timeline for this discovery appears recent, with the research team having sufficient observational data to make their classification proposal. The work represents the culmination of observations and analysis that allowed the researchers to identify these commonalities between the two objects.
The significance of this discovery lies in expanding our understanding of stellar evolution and the variety of objects that can result from stellar mergers. Establishing new stellar classifications helps astronomers better categorize the diverse population of stars and stellar remnants in the universe, potentially leading to the discovery of similar objects.
The research demonstrates how even a small sample of two objects can be sufficient to propose a new stellar class when they exhibit sufficiently unique and shared characteristics that distinguish them from existing classifications.