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

L. R. Bedin, M. Salaris, J. Anderson, M. Libralato, D. Apai, D. Nardiello, R. M. Rich, A. Bellini, A. Dieball, P. Bergeron, A. J. Burgasser, A. P. Milone, A. F. Marino

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Pages (from-to)3857-3865
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume488
Issue number3
DOIs
StatePublished - Jan 1 2019

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Keywords

  • Globular clusters: individual: NGC 6752
  • White dwarfs

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Bedin, L. R., Salaris, M., Anderson, J., Libralato, M., Apai, D., Nardiello, D., Rich, R. M., Bellini, A., Dieball, A., Bergeron, P., Burgasser, A. J., Milone, A. P., & Marino, A. F. (2019). The HST large programme on NGC 6752 – III. Detection of the peak of the white dwarf luminosity function. Monthly Notices of the Royal Astronomical Society, 488(3), 3857-3865. https://doi.org/10.1093/mnras/stz1968