Image of the Week
Globular Cluster colour-magnitude diagrams
|NGC 104 (47 Tuc)||NGC 5139 (Omega Cen)|
|NGC 6397|| |
NGC 6809 (M55)
Globular cluster fields are among the densest regions in the sky and therefore provide a reliable indication of the limits of the Gaia performances both in terms of astrometry and photometry. Their colour-magnitude diagrams are important instruments in the calibration of fundamental stellar parameters and in the testing of stellar evolution models.
Credits: ESA/Gaia/DPAC/CU5/F. De Angeli, D.W. Evans, M. Riello (University of Cambridge)
Image of the Week Archive