The spectral energy distributions of white dwarfs in 47 Tucanae: The distance to the cluster

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DOIResolve DOI: http://doi.org/10.1088/0004-6256/143/2/50
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TypeArticle
Journal titleAstronomical Journal
ISSN0004-6256
Volume143
Issue2
Article number50
AbstractWe present a new distance determination to the Galactic globular cluster 47 Tucanae by fitting the spectral energy distributions of its white dwarfs (WDs) to pure hydrogen atmosphere WD models. Our photometric data set 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 arcmin 2 and extend over a radial range of 5-13.7 arcmin (6.5-17.9pc) 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 4.69 0.04 0.13kpc, where the first error is random and the second is systematic. We also search the WD photometry for infrared excess in the F160W filter, indicative of low-mass companions, and find no convincing cases within our sample. © 2012. The American Astronomical Society. All rights reserved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics (HIA-IHA)
Peer reviewedYes
NPARC number21269217
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Record identifier4b15250b-6884-40ef-aff1-26422f1a422e
Record created2013-12-12
Record modified2016-05-09
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