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Properties of blue stragglers in young OB associations
The properties of the blue stragglers (BS) belonging to the associationsSco OB1, Cyg OB1, Car OB1, Cen OB1, and Per OB1 as well as of the earlyO stars belonging to Cas OB6 are studied on the basis of an extensivesurvey of the literature. Eleven of the thirteen BS for which therelevant information exists show an enhanced atmospheric abundance of N,which is interpreted as supporting the view (Maeder, 1987) that BS areprobably quasi-homogeneously evolved stars where the products of the CNOcycle have become observable at the surface. The mechanism inducing theturbulent diffusion responsible for the homogeneization of the stellarinterior does not clearly appear from the existing data. Tidal forces inclose binaries may play a role in some cases, but except in the case ofPer OB1 there is no convincing evidence that single BS have abnormallylarge rotational velocities. Finally the scenario of quasi-homogeneousevolution of the BS is not in contradiction with the observed propertiesof their likely descendents, the Wolf-Rayet stars, which are present inthe associations under consideration. The results presented in thispaper point toward the need for more observational data.
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