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• W2949721844 startingPage "L22" @default.
• W2949721844 abstract "Recent Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS) observations revealed the presence of a double subgiant branch (SGB) in the core of the Galactic globular cluster NGC 1851. This peculiarity was tentatively explained by the presence of a second population with either an age difference of about 1 Gyr, or a higher C+N+O abundance, probably due to pollution by the first generation of stars. In this Letter, we analyze VLT-FORS V, I images, covering 127 × 127, in the southwest quadrant of the cluster, allowing us to probe the extent of the double SGB from ∼14 to ∼13' from the cluster center. Our study reveals, for the first time, that the peculiar population is the one associated with the fainter SGB. Indeed, while the percentage of stars in this sequence is about 45% in the cluster core (as previously found on the basis of ACS/HST data), we find that it drops sharply, to a level consistent with zero in our data, at ∼24 from the cluster center, where the brighter SGB, in our sample, still contains ∼100 stars. Implications for the proposed scenarios are discussed." @default.
• W2949721844 created "2019-06-27" @default.
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• W2949721844 date "2009-04-29" @default.
• W2949721844 modified "2023-10-11" @default.
• W2949721844 title "THE RADIAL EXTENT OF THE DOUBLE SUBGIANT BRANCH IN NGC 1851" @default.
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• W2949721844 doi "https://doi.org/10.1088/0004-637x/697/1/l22" @default.
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