We use high-resolution spectra obtained with the ESO Very Large Telescope to measure surface abundance patterns of 43 blue straggler stars (BSSs) in 47 Tuc. We discovered that a subpopulation of BSSs shows a significant depletion of carbon and oxygen with respect to the dominant population. This evidence would suggest the presence of CNO burning products on the BSS surface coming from a deeply peeled parent star, as expected in the case of a mass transfer process. This is the first detection of a chemical signature clearly pointing to a specific BSS formation process in a globular cluster.

Discovery of Carbon/Oxygen-depleted Blue Straggler Stars in 47 Tucanae: The Chemical Signature of a Mass Transfer Formation Process

FERRARO, FRANCESCO ROSARIO;SABBI, ELENA;LANZONI, BARBARA;BECCARI, GIACOMO;
2006

Abstract

We use high-resolution spectra obtained with the ESO Very Large Telescope to measure surface abundance patterns of 43 blue straggler stars (BSSs) in 47 Tuc. We discovered that a subpopulation of BSSs shows a significant depletion of carbon and oxygen with respect to the dominant population. This evidence would suggest the presence of CNO burning products on the BSS surface coming from a deeply peeled parent star, as expected in the case of a mass transfer process. This is the first detection of a chemical signature clearly pointing to a specific BSS formation process in a globular cluster.
Ferraro F. R.; Sabbi E.; Gratton R.; Piotto G.; Lanzoni B.; Carretta E.; Rood R. T.; Sills A.; Fusi Pecci F.; Moehler S.; Beccari G.; Lucatello S.; Compagni N.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/29631
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