Published in

Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 3(437), p. 2621-2631, 2013

DOI: 10.1093/mnras/stt2074

Cambridge University Press (CUP), Proceedings of the International Astronomical Union, S290(8), p. 187-188, 2012

DOI: 10.1017/s1743921312019540

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Hα photometry of low-mass stars in 47 Tucanae: chromospheric activity and exotica

Journal article published in 2013 by Giacomo Beccari ORCID, Guido De Marchi, Nino Panagia, Luca Pasquini
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

AbstractWe have used archival Hubble Space Telescope (HST) observations obtained with the Advanced Camera for Surveys (ACS) to study the Hα emission properties of main sequence (MS) stars in the globular cluster 47 Tucanae. An accurate photometric measurement of their Hα equivalent width, allows us to identify objects with large Hα emission. We demonstrate that this method allows us to identify and characterise candidate cataclysmic variables (CVs) with high efficiency, reconciling observations with theoretical predictions on the number of dynamically formed CVs expected in a 47 Tucanae-like globular cluster.

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