The Spectral Energy Distributions of White Dwarfs in 47 Tucanae: The Distance to the Cluster

(10) American Museum of Natural History); (2) STScI; 3); (3) John Hopkins University; (4) Universitat Heidelberg; (5) Universite de Montreal; (6) University of Guelph; (7) Herzberg Institute of Astrophysics; (8) University of California at Los Angeles; (9) Swinburne University of Technology

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The Spectral Energy Distributions of White Dwarfs in 47 Tucanae: The Distance to the Cluster

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arxiv 1112.1425 v1 pith:CE7E5E73 submitted 2011-12-06 astro-ph.GA

K. A. Woodley (1) , R. Goldsbury (1) , J. S. Kalirai (2 , 3) , H. B. Richer (1) , P.-E. Tremblay (4) , J. Anderson (2) , P. Bergeron (5)

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A. Dotter (2) L. Esteves (6) G. G. Fahlman (7 B). M. S. Hansen (8) J. Heyl (1) J. Hurley (9) R. M. Rich (8) M. M. Shara (10) P. B. Stetson (7) ((1) University of British Columbia (2) STScI (3) John Hopkins University (4) Universitat Heidelberg (5) Universite de Montreal (6) University of Guelph (7) Herzberg Institute of Astrophysics (8) University of California at Los Angeles (9) Swinburne University of Technology (10) American Museum of Natural History)

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We present a new distance determination to the Galactic globular cluster 47 Tucanae by fitting the spectral energy distributions of its white dwarfs to pure hydrogen atmosphere white dwarf models. Our photometric dataset is obtained from a 121 orbit Hubble Space Telescope program using the Wide Field Camera 3 UVIS/IR channels, capturing F390W, F606W, F110W, and F160W images. These images cover more than 60 square arcmins and extend over a radial range of 5-13.7 arcmin (6.5-17.9 pc) within the globular cluster. Using a likelihood analysis, we obtain a best fitting unreddened distance modulus of (m - M)o=13.36+/-0.02+/-0.06 corresponding to a distance of 4.70+/-0.04+/-0.13 kpc, where the first error is random and the second is systematic. We also search the white dwarf photometry for infrared excess in the F160W filter, indicative of debris disks or low mass companions, and find no convincing cases within our sample.

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