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The White Dwarf Distance to the Globular Cluster 47 Tucanae and its Age

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arxiv astro-ph/0101485 v1 pith:45IBLQYJ submitted 2001-01-26 astro-ph

The White Dwarf Distance to the Globular Cluster 47 Tucanae and its Age

M. Zoccali , A. Renzini , S. Ortolani , A. Bragaglia , R. Bohlin , E. Carretta , F.R. Ferraro , R. Gilmozzi
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J.B. Holberg G. Marconi R.M. Rich F. Wesemael
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classification astro-ph
keywords distanceclustersequenceapparentdeterminationdwarfglobularlocal
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We present a new determination of the distance (and age) of the Galactic globular cluster 47 Tucanae (NGC 104) based on the fit of its white dwarf (WD) cooling sequence with the empirical fiducial sequence of local WD with known trigonometric parallax, following the method described in Renzini et al. (1996). Both the cluster and the local WDs were imaged with HST+WFPC2 using the same instrument setup. We obtained an apparent distance modulus of $(m-M)_V=13.27\pm0.14$ consistent with previous ground-based determinations and shorter than that found using HIPPARCOS subdwarfs. Coupling our distance determination with a new measure of the apparent magnitude of the main sequence turnoff, based on our HST data, we derive an age of $13\pm2.5$ Gyr.

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  1. A new likely pulsar binary in 47~Tucanae from continuum searches

    astro-ph.HE 2026-07 conditional novelty 6.0

    47 Tuc W41 is a redback millisecond-pulsar binary with Lx ~ 3e31 erg/s, steep-spectrum radio continuum, and an irradiated ~0.5 Msun secondary on a 10.4-hr orbit.