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13 papers · 1 filter
Discovery of Eclipsing Binary Central Stars in the Planetary Nebulae M 3-16, H 2-29 and M 2-19
B. Miszalski, A. Acker, A. F. J. Moffat +2
Progress in understanding the formation and evolution of planetary nebulae (PN) has been restricted by a paucity of well-determined central star masses. To address this deficiency…
MOST photometry and modeling of the rapidly oscillating (roAp) star gamma Equ
M. Gruberbauer, H. Saio, D. Huber +9
Aims. Despite photometry and spectroscopy of its oscillations obtained over the past 25 years, the pulsation frequency spectrum of the rapidly oscillating Ap (roAp) star gamma Equ…
Radiative Accelerations in Stellar Evolution
G. Michaud, J. Richer
A brief review of various methods to calculate radiative accelerations for stellar evolution and an analysis of their limitations are followed by applications to Pop I and Pop II s…
Dark matter in low mass surface density galaxies
Laurent Chemin, Claude Carignan, Philippe Amram
Low mass surface density spiral and irregular galaxies like low surface brightness (LSB) and dwarf galaxies are unique laboratories to study the dynamical properties of Dark Matter…
MOST photometry of the RRd Lyrae variable AQ Leo: Two radial modes, 32 combination frequencies, and beyond
Michael Gruberbauer, Katrien Kohlenberg, Jason F. Rowe +12
Highly precise and nearly uninterrupted optical photometry of the RR Lyrae star AQ Leo was obtained with the MOST (Microvariability & Oscillations of STars) satellite over 34.4 day…
On the Spectral Evolution of Cool, Helium-Atmosphere White Dwarfs: Detailed Spectroscopic and Photometric Analysis of DZ Stars
P. Dufour, P. Bergeron, James Liebert +6
We present a detailed analysis of a large spectroscopic and photometric sample of DZ white dwarfs based on our latest model atmosphere calculations. We revise the atmospheric param…