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5 papers · 2 filters
Optical spectroscopy of the candidate luminous white dwarf in the young LMC cluster NGC1818
M. R. Burleigh, R. A. Saffer, G. F. Gilmore +1
An optical spectrum of the Elson et al. (1998) candidate luminous white dwarf in the young LMC cluster NGC1818 shows conclusively that it is not a degenerate star. A model atmosphe…
The LMC eclipsing binary HV 2274: fundamental properties and comparison with evolutionary models
Ignasi Ribas, Edward F. Guinan, Edward L. Fitzpatrick +6
We are carrying out an international, multi-wavelength program to determine the fundamental properties and independent distance estimates of selected eclipsing binaries in the LMC…
Determining the Physical Properties of the B Stars I. Methodology and First Results
Edward L. Fitzpatrick, D. Massa
We describe a new approach to fitting the UV-to-optical spectra of B stars to model atmospheres and present initial results. Using a sample of lightly reddened stars, we demonstrat…
Spatial Variability in the Ratio of Interstellar Atomic Deuterium to Hydrogen. I. Observations toward delta Orionis by the Interstellar Medium Absorption Profile Spectrograph
Edward B. Jenkins, Todd M. Tripp, Przemyslaw R. Wozniak +2
Studies of the abundances of deuterium in different astrophysical sites are of fundamental importance to answering the question about how much deuterium was produced during big ban…
A Comparative Study of the Mass Distribution of Extreme Ultraviolet-Selected White Dwarfs
Ralf Napiwotzki, Paul J. Green, Rex A. Saffer
We present new determinations of effective temperature, surface gravity, and masses for a sample of 46 hot DA white dwarfs selected from the EUVE and ROSAT Wide Field Camera bright…