Jeremy Heyl, Harvey B. Richer, Elisa Antolini, Ryan Goldsbury, Jason S. Kalirai, Javiera Parada, Pier-Emmanuel Tremblay,
... through the core of the globular cluster 47 Tucanae using a sample of young white dwarfs identified in these observations. This is the first direct measurement of diffusion due to gravitational relaxation. We find that the diffusion rate $\kappa\approx 10-13$ arcsecond$^2$ Myr$^{-1}$ is consistent with theoretical estimates of the relaxation time in the core of 47 Tucanae of about 70 Myr.
Tópico(s): Astronomy and Astrophysical Research
2015 - IOP Publishing | The Astrophysical Journal