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Observations of the Bright Star in the Globular Cluster 47 Tucanae (NGC 104)
William V. Dixon, Pierre Chayer, Marcelo Miguel Miller Bertolami +3
The Bright Star in the globular cluster 47 Tucanae (NGC 104) is a post-AGB star of spectral type B8 III. The ultraviolet spectra of late-B stars exhibit a myriad of absorption feat…
Observations of the Ultraviolet-Bright Star Barnard 29 in the Globular Cluster M13 (NGC 6205)
William V. Dixon, Pierre Chayer, I. N. Reid +1
We have analyzed FUSE, COS, GHRS, and Keck HIRES spectra of the UV-bright star Barnard 29 in M13 (NGC 6205). By comparing the photospheric abundances derived from multiple ionizati…
Observations of the Ultraviolet-Bright Star Y453 in the Globular Cluster M4 (NGC 6121)
William V. Dixon, Pierre Chayer, Marilyn Latour +2
We present a spectral analysis of the UV-bright star Y453 in M4. Model fits to the star's optical spectrum yield T_eff ~ 56,000 K. Fits to the star's FUV spectrum, obtained with th…
Resonances in the Photoionization Cross Sections of Atomic Nitrogen Shape the Far-Ultraviolet Spectrum of the Bright Star in 47 Tucanae
William V. Dixon, Pierre Chayer
The far-ultraviolet (FUV) spectrum of the Bright Star (B8 III) in 47 Tuc (NGC 104) shows a remarkable pattern: it is well fit by LTE models at wavelengths longer than Lyman beta, b…