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43 papers · 1 filter
EROS differential studies of Cepheids in the Magellanic Clouds : Stellar pulsation, stellar evolution and distance scale
J. P. Beaulieu, D. D. Sasselov
We present a differential study of 500 Magellanic Cepheids with 3 million measurements obtained as a by-product of the EROS microlensing survey. The data-set is unbiased and provid…
A stratified framework for scalar-tensor theories of Modified Dynamics
R. H. Sanders
Although the modified dynamics (MOND) proposed by Milgrom successfully accounts for the systematics of galaxy rotation curves and cluster dynamics without invoking dark matter, the…
Gas Mass Fractions and the Evolution of Spiral Galaxies
Stacy S. McGaugh, W. J. G. de Blok
We show that the gas mass fraction of spiral galaxies is strongly correlated with luminosity and surface brightness. It is not correlated with linear size. Gas fraction varies with…
Infrared spectroscopic study of phonons coupled to charge excitations in FeSi
A. Damascelli, K. Schulte, D. van der Marel +1
From an investigation of the optical conductivity of FeSi single crystals using FTIR spectroscopy in the frequency range from 30 to 20000 wavenumbers we conclude that the transvers…
Gas Content and Star Formation Thresholds in the Evolution of Spiral Galaxies
Stacy McGaugh, Erwin de Blok
The gas mass fraction (fg) of spiral galaxies is strongly correlated with the central surface brightness of their disks. There exist many dim galaxies with long gas consumption tim…
Dynamical Stability and Galaxy Evolution in LSB Disk Galaxies
Chris Mihos, Stacy McGaugh, Erwin de Blok
We demonstrate that, due to their low surface mass density and large dark matter content, LSB disks are quite stable against the growth of global bar modes. However, they may be on…