SIMBAD references

2015ApJ...804...53H - Astrophys. J., 804, 53 (2015/May-1)

A measurement of diffusion in 47 Tucanae.

HEYL J., RICHER H.B., ANTOLINI E., GOLDSBURY R., KALIRAI J., PARADA J. and TREMBLAY P.-E.

Abstract (from CDS):

Using images from the Hubble Space Telescope Wide-Field Camera 3, we measure the rate of diffusion of stars through the core of the globular cluster 47 Tucanae (47 Tuc) using a sample of young white dwarfs that were identified in these observations. This is the first direct measurement of diffusion due to gravitational relaxation. We find that the diffusion rate K ≈ 10 - 13 arcsec2/Myr is consistent with theoretical estimates of the relaxation time in the core of 47 Tuc of about 70 Myr.

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Journal keyword(s): globular clusters: individual: 47 Tuc - Hertzsprung-Russell and C-M diagrams - stars: kinematics and dynamics - stars: Population II

Simbad objects: 3

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