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Hubble Space Telescope observations of the Kepler-field cluster NGC 6819 - I. The bottom of the white dwarf cooling sequence

Bedin, L. R.; Salaris, M.; Anderson, J.; Cassisi, S.; Milone, A. P.; Piotto, G.; King, I. R.; Bergeron, P.

Description

We use Hubble Space Telescope (HST) to reach the end of the white dwarf (WD) cooling sequence (CS) in the solar-metallicity open cluster NGC 6819. Our photometry and completeness tests show a sharp drop in the number of WDs along the CS at magnitudes fainter than mF606W = 26.050 ± 0.075. This implies an age of 2.25 ± 0.20 Gyr, consistent with the age of 2.25 ± 0.30 Gyr obtained from fits to the main-sequence turn-off. The use of different WD cooling models and initial–final-mass relations have...[Show more]

CollectionsANU Research Publications
Date published: 2015-02-17
Type: Journal article
URI: http://hdl.handle.net/1885/13510
Source: Monthly Notices of the Royal Astronomical Society
DOI: 10.1093/mnras/stv069

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