Y453 is the star in the M4 cluster, which is 7200 light-years distant from us. Such ultraviolet stars act as mysterious objects. They evolved from an asymptotic giant branch or from an extreme horizontal branch. Detailed study will help improve the understanding of the evolutionary process of low-mass stars and the formation of white dwarfs.
A Hubble spectrograph was used for observation. Observations on the Y453 were conducted on February 9, 2015. According to the temperature index, the object was heated to 71675 K. The mass reaches 0.53 solar, and the radius - 0.17 solar. The data indicates that a particular star has evolved from a blue horizontal branch. Also, the photosphere showed the presence of carbon, oxygen, helium, sulfur, chromium, nitrogen, iron, silicon and nickel. The amount of nitrogen, carbon and oxygen exceeded the second-generation stars. Most likely, the observed levels reflect the effects of diffuse and mechanical processes in the photosphere.
