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Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 3(488), p. 3857-3865, 2019

DOI: 10.1093/mnras/stz1968

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The HST large programme on NGC 6752 – III. Detection of the peak of the white dwarf luminosity function

Journal article published in 2019 by L. R. Bedin ORCID, M. Salaris, J. Anderson, M. Libralato ORCID, D. Apai, D. Nardiello ORCID, R. M. Rich ORCID, A. Bellini, A. Dieball, P. Bergeron, A. J. Burgasser ORCID, A. P. Milone ORCID, A. F. Marino ORCID
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

ABSTRACT We report on the white dwarf (WD) cooling sequence of the old globular cluster NGC 6752, which is chemically complex and hosts a blue horizontal branch. This is one of the last globular cluster WD cooling sequences accessible to imaging by the Hubble Space Telescope. Our photometry and completeness tests show that we have reached the peak of the luminosity function of the WD cooling sequence, at a magnitude mF606W = 29.4 ± 0.1, which is consistent with a formal age of ∼14 Gyr. This age is also consistent with the age from fits to the main-sequence turn-off (13–14 Gyr), reinforcing our conclusion that we observe the expected accumulation of WDs along the cooling sequence.