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arxiv: 0903.2839 · v1 · pith:LPVLXFGLnew · submitted 2009-03-16 · 🌌 astro-ph.GA

The End of the White Dwarf Cooling Sequence in M4: an efficient approach

L. R. Bedin (1) , M. Salaris (2) , G. Piotto (3) , J. Anderson (1) , I. R. King (4) , S. Cassisi (5) ((1) STScI , (2) J.M.Univ.Liverpool , (3) Univ.PD
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(4) Univ.of Washington Seattle (5) INAF-Obs.Teramo)
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keywords sequencecoolingapproachclustercompletenessconsistentdwarfefficient
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We use 14 orbits of ACS observations to reach the end of the white-dwarf cooling sequence in the globular cluster M4. Our photometry and completeness tests show that the end is located at magnitude m_F606W = 28.5+/-0.1, which implies an age of 11.6+/-0.6 Gyr (internal errors only). This is consistent with the age from fits to the main sequence turn-off (12.0+/-1.4 Gyr).

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