Home List of Titles The spectral energy distributions of white dwarfs in 47 Tucanae: the distance to the cluster
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/215468
- The spectral energy distributions of white dwarfs in 47 Tucanae: the distance to the cluster
- Woodley, K. A.; Goldsbury, R.; Kalirai, J. S.; Richer, H. B.; Tremblay, P. E.; Anderson, J.; Bergeron, P.; Dotter, A.; Esteves, L.; Fahlman, G. G.; Hansen, B. M. S.; Heyl, J.; Hurley, J.; Rich, R. M.; Shara, M. M.; Stetson, P. B.
- We 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 arcmin2 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 4.69 ± 0.04 ± 0.13 kpc, 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.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
- Astronomical Journal, Vol. 143, no. 2 (Feb 2012), article no. 50
- Publication year
- FOR Code(s)
- 0201 Astronomical and Space Sciences
- 47 Tucanae; Distances; Globular clusters; Spectral energy; Stars; White dwarfs
- Institute of Physics Publishing
- Publisher URL
- Copyright © 2012 The American Astronomical Society. All rights reserved. The American Astronomical Society does not allow institutions to archive either the accepted manuscript or the published version of the article. However, you can find an earlier version of the full text here: http://arxiv.org/abs/1112.1425.
- Peer reviewed