357 citations · 508 across the 7 of their papers we have counts for
7 papers
Hot Degenerates in the MCT Survey. III. A Sample of White Dwarf Stars in the Southern Hemisphere
P. Bergeron, F. Wesemael, G. Fontaine +7
We present optical spectra of 144 white dwarfs detected in the Montreal-Cambridge-Tololo (MCT) colorimetric survey, including 120 DA, 12 DB, 4 DO, 1 DQ, and 7 DC stars. We also per…
A search for magnetic fields in cool sdB stars
G. Mathys, S. Hubrig, E. Mason +3
Hot cluster Horizontal Branch (HB) stars and field subdwarf B (sdB) stars are core helium burning stars that exhibit abundance anomalies that are believed to be due to atomic diffu…
A Comprehensive Spectroscopic Analysis of DB White Dwarfs
P. Bergeron, F. Wesemael, Pierre Dufour +9
We present a detailed analysis of 108 helium-line (DB) white dwarfs based on model atmosphere fits to high signal-to-noise optical spectroscopy. We derive a mean mass of 0.67 Mo fo…
Multiwavelength Observations of the Hot DB Star PG 0112+104
P. Dufour, S. Desharnais, F. Wesemael +8
We present a comprehensive multiwavelength analysis of the hot DB white dwarf PG 0112+104. Our analysis relies on newly-acquired FUSE observations, on medium-resolution FOS and GHR…
Discovery of Spectroscopic Variations in the DAB White Dwarf GD 323
C. Pereira, P. Bergeron, F. Wesemael
We report the discovery of spectroscopic variations in GD 323, the prototypical DAB white dwarf. Simultaneous optical spectroscopic observations over five consecutive nights of GD…
The White Dwarf Distance to the Globular Cluster 47 Tucanae and its Age
M. Zoccali, A. Renzini, S. Ortolani +9
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 em…
The White Dwarf Distance to the Globular Cluster NGC 6752 (and its Age) with the Hubble Space Telescope (Based on observations made with the NASA/ESA Hubble Space Telescope (HST))
Alvio Renzini, Angela Bragaglia, Francesco R. Ferraro +6
Deep Hubble Space Telescope (HST) observations with WFPC2 of the nearby globular cluster NGC 6752 have allowed us to obtain accurate photometry for the cluster white dwarfs (WD). A…