Blue stragglers - A search for binaries in the infrared

Manteiga, M.; Martinez Roger, C.; Morales, C.; Sabau, L.
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Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. 49-58. Research supported by Ministerio de Educacion y Ciencia of Spain.

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Infrared photometry in the J, H and K bands, performed on a sample of 33 blue stragglers (BS) belonging to 8 open clusters is presented. This photometry has been combined with published Johnson UBV photometry to search for possible cold companions among the BS, as expected for Case B close binary evolution. Probable binaries were identified by comparison with standard mean color relations for single stars. The number of binary detections is discussed together with the results of a previous spectroscopic search for binaries among BS (Manteiga et al. 1989), and the consequences for the hypothesis of binarity for the origin of BS are analyzed.