A comparison of DA white dwarf temperatures and gravities from FUSE Lyman line and ground-based Balmer line observations

  title={A comparison of DA white dwarf temperatures and gravities from FUSE Lyman line and ground-based Balmer line observations},
  author={Martin A Barstow and Simon Good and Matthew R. Burleigh and I. Hubeny and Jay B. Holberg and Andrew J. Levan},
  journal={Monthly Notices of the Royal Astronomical Society},
The observation of the strengths and profiles of the hydrogen Balmer absorption series is an established technique for determining the effective temperature and surface gravity of hot H-rich white dwarf stars. In principle, the Lyman series lines should be equally useful but, lying in the far-ultraviolet (FUV), are only accessible from space. Nevertheless, there are situations (for example, where the optical white dwarf spectrum is highly contaminated by the presence of a companion) in which… 
Comparison of the effective temperatures, gravities and helium abundances of DAO white dwarfs from Balmer and Lyman line studies
The use of observations of the hydrogen Balmer absorption series is a well-established method of determining the surface gravity and effective temperature ( T eff ) of white dwarfs. In situations
A Comparative Study of Optical and Ultraviolet Effective Temperatures for DA White Dwarfs from the IUE Archive
We present a comparative study of effective temperatures determined from the hydrogen Balmer lines and from the UV energy distribution for 140 DA white dwarfs drawn from the International Ultraviolet
Evidence for an external origin of heavy elements in hot DA white dwarfs
We present a series of systematic abundance measurements for 89 hydrogen atmosphere (DA-type) white dwarfs with temperatures spanning 16 000–77 000 K drawn from the FUSE spectral archive. This is the
UV studies of the local interstellar medium
We present new measurements of the spatial distribution of cool and hot gas in the local interstellar medium as a result of a search for O VI absorption in the FUV spectra of 100 white dwarfs at
Hubble Space Telescope spectroscopy of the Balmer lines in Sirius B
Sirius B is the nearest and brightest of all white dwarfs, but it is very difficult to observe at visible wavelengths due to the overwhelming scattered light contribution from Sirius A. However, from
A photospheric metal line profile analysis of hot DA white dwarfs with circumstellar material
Some hot DA white dwarfs have circumstellar high ion absorption features in their spectra, in addition to those originating in the photosphere. In many cases, the line profiles of these absorbing
Structure and Evolution of White Dwarfs and their Interaction with the Local Interstellar Medium
The development of far-UV astronomy has been particularly important for the study of hot white dwarf stars. A significant fraction of their emergent flux appears in the far-UV and traces of elements
O VI in the Local Interstellar Medium
It appears that there is much less O VI-bearing gas than previously stated within the inner rarefied regions of the local interstellar cavity, and there is no strong evidence to support a spatial correlation between O VI and SXRB emission.
Far Ultraviolet Spectroscopic Explorer Observation of the Ultramassive White Dwarf PG 1658+441
We present an analysis of the Far Ultraviolet Spectroscopic Explorer (FUSE) spectrum of the ultramassive (M = 1.31 M☉), magnetic (Bs = 2.3 MG) white dwarf PG 1658+441. The far-ultraviolet (FUV)
Parameter-free stark broadening of hydrogen lines in DA white dwarfs
We present new calculations for the Stark broadening of the hydrogen line profiles in the dense atmospheres of white dwarf stars. Our improved model is based on the unified theory of Stark broadening


A comparison of DA white dwarf temperatures and gravities from Lyman and Balmer line studies
Measurements of the effective temperatures and surface gravities for a sample of hot DA white dwarfs, using the Lyman line data available from the HUT, ORFEUS and FUSE FUV space missions, find that there is a general good overall agreement between the two methods.
An EUV-selected sample of DA white dwarfs from the ROSAT All-Sky Survey — I. Optically derived stellar parameters
One of the most important results of the ROSAT All-Sky X-ray and EUY Surveys has been the detection of a large number of white dwarfs, allowing a detailed study of the general properties of DA white
The Temperature Scale and Mass Distribution of Hot DA White Dwarfs
Results are presented from a comprehensive spectroscopic survey of DA white dwarfs hotter than ~25,000 K. The observations consisted of CCD spectra with signal-to-noise ratios of ~100 in the blue,
Interstellar and photospheric opacity from EUV spectroscopy of DA white dwarfs
We present a detailed analysis of the extreme-ultraviolet (EUV) spectra of 13 hydrogen-rich DA white dwarfs, observed by the Extreme Ultraviolet Explorer (EUVE) satellite, paying attention to the
DA white dwarf effective temperatures determined from IUE Lyman-alpha profiles
The Lyman-alpha profiles of 12 DA white dwarfs have been obtained with the International Ultraviolet Explorer Satellite. Analysis of these profiles provides an improved, uniform, and relatively
Hot White Dwarfs in the Extreme Ultraviolet Explorer Survey. II. Mass Distribution, Space Density, and Population Age*
We present new effective temperature and surface gravity determinations for a sample of 90 hot white dwarfs detected in the Extreme Ultraviolet Explorer (EUVE) all-sky survey. The measurements, based
Hot White Dwarfs in the Extreme-Ultraviolet Explorer Survey. IV. DA White Dwarfs with Bright Companions
We present an analysis of optical, ultraviolet, and X-ray spectral properties of a sample of 13 hot hydrogen-rich (DA) white dwarfs, each paired with a luminous unresolved companion. Using
Comparison of White Dwarf Models with STIS Spectrophotometry
Computed flux distributions for four white dwarf (WD) stars with nearly pure hydrogen atmospheres are tied to the Vega flux scale with V-band Landolt photometry. With broadband photometric precision
Adding More Mysteries to the DA White Dwarf GD 394
We present spectroscopic and timing analyses of the hot DA white dwarf GD 394 showing abundance inhomogeneities across its surface. Lick Hamilton echelle, International Ultraviolet Explorer (IUE),
Fuse observations of PG1342+444: new insights into the nature of the hottest DA white dwarfs
We present Far Ultraviolet Spectroscopic Explorer (FUSE) observations of the very hot (T e f f 60 000 K) DA white dwarf PG1342+444, describing our data reduction and analysis techniques. The spectrum