8 papers
Effects of mass loss for highly-irradiated giant planets
W. B. Hubbard, M. F. Hattori, A. Burrows +2
We present calculations for the evolution and surviving mass of highly-irradiated extrasolar giant planets (EGPs) at orbital semimajor axes ranging from 0.023 to 0.057 AU using a g…
Preliminary analysis of an extreme helium sdO star: BD+25 4655
J. Budaj, V. Elkin, I. Hubeny
Preliminary analysis of CCD spectra obtained by the 6m SAO telescope is presented. We have used simple H-He NLTE model atmospheres computed by TLUSTY to derive the basic parameters…
A New Formation Mechanism for the Hottest Horizontal-Branch Stars
Allen V. Sweigart, Thomas M. Brown, Thierry Lanz +2
Stars with very large mass loss on the red-giant branch can undergo the helium flash while descending the white-dwarf cooling curve. Under these conditions the flash convection zon…
Heavy element abundances in DA white dwarfs
M. A. Barstow, M. R. Burleigh, N. P. Bannister +4
We present a series of systematic abundance measurements for a group of hot DA white dwarfs in the temperature range 20,000-75,000K, based on far-UV spectroscopy with STIS on HST,…
FUSE Observations of the hottest DA white dwarfs
M. A. Barstow, M. R. Burleigh, N. P. Bannister +2
We report early FUSE observations of the very hot DA white dwarfs PG1342+444 and REJ0558-371. Detection of photospheric absorption lines allows us to estimate the abundances of C,…
Opacities along the line of sight to and in the atmosphere of the white dwarf in the close detached DAO+dM binary RE J0720-318 (V* IN CMa)
P. D. Dobbie, M. A. Barstow, M. R. Burleigh +1
We present the results from a multi-wavelength study of the mixed H+He composition DAO white dwarf RE J0720-318. A detailed analysis of UV and EUV spectroscopic data with state-of-…