SIMBAD references

2006ApJ...647L..53F - Astrophys. J., 647, L53-L56 (2006/August-2)

Discovery of carbon/oxygen-depleted blue straggler stars in 47 Tucanae: the chemical signature of a mass transfer formation process.

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. and COMPAGNI N.

Abstract (from CDS):

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.

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Journal keyword(s): Stars: Blue Stragglers - Galaxy: Globular Clusters: Individual: NGC Number: NGC 104 - Stars: Abundances - Stars: Evolution - Techniques: Spectroscopic

Simbad objects: 13

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