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The fresh water discharged by large rivers such as the Amazon is transported hundreds to thousands of kilometers away from the coast by surface plumes. The nutrients delivered by these river plumes contribute to enhanced primary production in the ocean, and the sinking flux of this new production results in carbon sequestration. Here, we report that the(More)
Using imaging that shows four magnitudes of main sequence stars, we have discovered that the Galactic globular cluster NGC 1851 is surrounded by a halo that is visible from the tidal radius of 700 arcsec (41 pc) to more than 4500 arcsec (>250 pc). This halo is symmetric and falls in density as a power law of r −1.24. It contains approximately 0.1% of the(More)
The stellar population and star clusters around six regions in the Large Magellanic Cloud (LMC) is studied to understand the correlation between star formation and cluster formation rates. We used the stellar data base of the OGLE II LMC survey and the star cluster catalogues. The observed distribution of stellar density on the colour-magnitude diagrams(More)
We present U BV RI CCD photometry in the region of the open clusters NGC 637 and NGC 957. The radii are found to be 4. ′ 2 and 4. ′ 3. Their reddenings E(B − V) are 0.64 ± 0.05 mag and 0.71 ± 0.05 mag and their distances, from main sequence fitting are 2.5 ± 0.2 kpc and 2.2 ± 0.2 kpc. Comparison with Z = 0.02 isochrones leads to an age of 10 ± 5 Myr for(More)
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