http://arxiv.org/abs/1809.07746
We use Hubble Space Telescope multicolour photometry of the globular cluster 47 Tucanae to uncover a population of 24 objects with no previous classification that are outliers from the single-star model tracks in the colour-magnitude diagram and yet are likely cluster members. By comparing those sources with evolutionary models and X-ray source catalogues, we were able to show that the majority of those sources are likely binary systems that do not have any X-ray source detected nearby, most possibly formed by a white dwarf and a main-sequence star and a small number of possible double-degenerate systems.
F. Campos, I. Pelisoli, S. Kamann, et. al.
Fri, 21 Sep 18
14/63
Comments: 13 pages, 8 figures, 2 tables. Accepted for publication in MNRAS on September 18, 2018
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