142 citations · 1.3k across the 30 of their papers we have counts for
9 papers · 1 filter
SDSS J142625.71+575218.3: The First Pulsating White Dwarf with a Large Detectable Magnetic Field
P. Dufour, G. Fontaine, J. Liebert +2
We report the discovery of a strong magnetic field in the unique pulsating carbon-atmosphere white dwarf SDSS J142625.71+575218.3. From spectra gathered at the MMT and Keck telesco…
Might Carbon-Atmosphere White Dwarfs Harbour a New Type of Pulsating Star?
G. Fontaine, P. Brassard, P. Dufour
In the light of the recent and unexpected discovery of a brand new type of white dwarfs, those with carbon-dominated atmospheres, we examine the asteroseismological potential of su…
Mapping the ZZ Ceti Instability Strip: Discovery of 6 New Pulsators
A. Gianninas, P. Bergeron, G. Fontaine
As part of an ongoing program to map better the empirical instability strip of pulsating ZZ Ceti white dwarfs, we present a brief progress report based on our last observing season…
The Potential of Multi-Colour Photometry for Pulsating Subdwarf B Stars
S. K. Randall, G. Fontaine, P. Brassard +1
We investigate the potential of multi-colour photometry for partial mode identification in both long- and short-period variable subdwarf B stars. The technique presented is based o…
Towards an Empirical Determination of the ZZ Ceti Instability Strip
A. Gianninas, P. Bergeron, G. Fontaine
We present atmospheric parameters for a large sample of DA white dwarfs that are known to be photometrically constant. For each star, we determine the effective temperature and sur…
Detailed Spectroscopic and Photometric Analysis of DQ White Dwarfs
P. Dufour, P. Bergeron, G. Fontaine
We present an analysis of spectroscopic and photometric data for cool DQ white dwarfs based on improved model atmosphere calculations. In particular, we revise the atmospheric para…
On the Purity of the ZZ Ceti Instability Strip: Discovery of More Pulsating DA White Dwarfs on the Basis of Optical Spectroscopy
P. Bergeron, G. Fontaine, M. Billeres +2
We report the discovery of two new ZZ Ceti pulsators, LP 133-144 and HE 1258+0123, selected on the basis of model atmosphere fits to optical spectroscopic data. The atmospheric par…
Cooling sequences and color-magnitude diagrams for cool white dwarfs with hydrogen-atmospheres
Gilles Chabrier, Pierre Brassard, Gilles Fontaine +1
We present new cooling sequences, color-magnitude diagrams, and color-color diagrams for cool white dwarfs with pure hydrogen atmospheres down to an effective temperature $\te=1500…
Gravity-Mode Instabilities in Models of Post-Extreme Horizontal Branch Stars: Another Class of Pulsating Stars?
S. Charpinet, G. Fontaine, P. Brassard +1
We present new results of a stability analysis of realistic models of post-extreme horizontal branch stars. We find that g-mode instabilities develop in some of these models as a r…