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UV studies of the local interstellar medium

By David Duncan Boyce


We present new measurements of the spatial distribution of cool and hot gas in the local\ud interstellar medium as a result of a search for O VI absorption in the FUV spectra of\ud 100 white dwarfs at distances between 50 and 300 pc. We have carried out a detailed\ud velocity analysis on the detected O VI lines to ascertain the degree of contamination from\ud the background star. The position of the stars relative to the local cavity is calculated\ud through cold gas phase column density measurements. Through curve of growth analysis\ud we note that the local cavity is depleted in metals relative to hydrogen by a factor of 5\ud -10 compared to the space beyond.\ud Whereas the O VI producing hot gas was originally thought to be observed in the interface\ud regions between hot and cold gas, i.e. the cavity wall, our investigation nds no\ud unambiguously hot gas in lines of sight that span such regions. We do, however, nd hot\ud gas at high galactic latitudes where there are no such walls. We discuss the wider context\ud of this result by comparing the position of these detections to the soft X-ray background.\ud This work ultimately changes our picture of the local interstellar environment and its\ud processes by removing the ubiquitous million degree gas that was once thought to surround\ud the solar system. One possible explanation worthy of further investigation is that\ud the local cavity has recently begun to be inundated by hot gas spilling out of the loop 1\ud supernova remnant.\ud In support of this work there is an enclosed CD that contains the data and models used in\ud this thesis. Examples of the information found on this CD can be found in the appendix.\ud Explanations of the data, charts and graphs can be found in the body of the text when\ud required

Publisher: University of Leicester
Year: 2009
OAI identifier:

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  1. (2003). 3D mapping of the dense interstellar gas around the Local Bubble’, doi
  2. (1993). A and its companion star’,
  3. (2003). A comparison of DA white dwarf temperatures and gravities from FUSE Lyman line and ground-based Balmer line observations’, doi
  4. (2001). A comparison of DA white dwarf temperatures and gravities from Lyman and Balmer line studies’, doi
  5. (1974). A comparison of interstellar Na I, Ca II, doi
  6. (1998). A High-Dispersion Spectroscopic Survey of the Hot White Dwarfs: doi
  7. (1994). A New Hot DA White Dwarf in a Region of Exeptionally Low HI Density’, doi
  8. (2007). A New Model for the Loop I (North Polar Spur) Region’, doi
  9. (1997). A search for hidden white dwarfs in the ROSAT extreme ultraviolet survey’, doi
  10. (1992). A spectroscopic determination of the mass distribution of DA white dwarfs’, doi
  11. (1979). A survey of interstellar C I - Insights on carbon abundances, UV grain albedos, and pressures in the interstellar medium’, doi
  12. (1974). A survey with doi
  13. (1977). A theory of the interstellar medium - Three components regulated by supernova explosions in an inhomogeneous substrate’, doi
  14. (2002). Abundances of Deuterium, Nitrogen, and Oxygen in the Local Interstellar Medium: Overview of First Results from the FUSE Mission’, doi
  15. (2003). Accretion and Outow in Interacting Binary Systems: Far Ultraviolet Spectroscopic Explorer Observations of the Novalike Cataclysmic Variable UX Ursae Majoris’, doi
  16. (1997). An active K0 IVV star and a hot white dwarf (EUVE J0702+129) in a wide binary.’, A&A 318, L9 L12.
  17. (1985). An analysis of the bright white dwarf CD - 38 deg 10980’, doi
  18. (2002). An Atlas of Far Ultraviolet Spectroscopic Explorer Sight Lines toward the Magellanic Clouds’, doi
  19. (1997). An EUV-selected sample of DA white dwarfs from the ROSAT All-Sky Survey - I. Optically derived stellar parameters’, doi
  20. (1976). An extrasolar extreme-ultraviolet object. II - The nature of HZ 43’, doi
  21. (1983). An infrared search for very low mass stars - JHK photometry and results for composite systems’, doi
  22. (1997). Atlas of Galactic Neutral Hydrogen, Atlas of Galactic Neutral Hydrogen, by Dap Hartmann doi
  23. (1979). Atmospheric parameters and mass distribution of DA white dwarfs’,
  24. (1983). Atmospheric parameters and mass distribution of DA-white dwarfs’, doi
  25. (2008). Boyce has made signicant contributions to the following publications
  26. (1918). Bulletin Number 326 - The occurrence of stationary D lines of sodium in the spectrscopic binaries, Beta Scorpii and delta Orionis.’, doi
  27. (1918). Bulletin Number 332 - The ultra-violet spectrum of alpha Cygni’, doi
  28. (2007). CalFUSE Version 3: A Data Reduction Pipeline for the Far Ultraviolet Spectroscopic Explorer’, doi
  29. (1982). Carbon and oxygen X-ray line emission from the interstellar medium’, doi
  30. (1990). Collision of cosmological shock waves produced by explosions and formation of large-scale structures’, doi
  31. (1974). Column densities of interstellar molecular hydrogen’, doi
  32. (1989). Consequences of a conductive boundary on the local cloud. I - No dust’, doi
  33. (1986). DA white dwarf effective temperatures determined from IUE Lyman-alpha proles’, doi
  34. (1968). Detection of an Anisotropic Soft X-Ray Background Flux’, doi
  35. (1998). Detection of spatial variations in the (D/H) ratio in the local interstellar medium’,
  36. (2002). Deuterium Abundance toward WD 0621-376: Results from the FUSE Mission’, doi
  37. (2002). Deuterium Abundance toward WD 1634-573: Results from the FUSE Mission’, doi
  38. (1982). Discovery of highly ionized species in the ultraviolet spectrum of Feige 24’, doi
  39. (1969). Discovery of interstellar water vapour.’,
  40. (2006). Dust Destruction In The High-velocity Shocks Driven By Supernovae In The Early Universe, doi
  41. (1993). Effective radiative cooling in optically thin plasmas’,
  42. (1978). Effective temperatures of hot white dwarfs’,
  43. (1999). EUV mapping of the local interstellar medium: the Local Chimney revealed?’,
  44. (1999). Evidence for an ionization gradient in the local interstellar medium: EUVE observations of white dwarfs’,
  45. (1994). Evidence for Homogeneous Ionization of Helium in the Local Interstellar Medium from doi
  46. (1993). Extreme ultraviolet observations of G191-B2B and the local interstellar medium with the Hopkins Ultraviolet Telescope’, doi
  47. (2005). Far Ultraviolet Spectroscopic Explorer Measurements of Interstellar Fluorine’, doi
  48. (2001). Far Ultraviolet Spectroscopic Explorer observations of high-velocity gas associated with the Monoceros Loop SNR’, doi
  49. (2003). Far Ultraviolet Spectroscopic Explorer Survey of the Local Interstellar Medium within 200 Parsecs’, doi
  50. (2003). Flux-Tube Dynamics and a Model for the Origin of the Local Fluff’, doi
  51. (2001). FUSE observations of hot white dwarfs’, doi
  52. (2002). FUSE observations of PG1342+444: new insights into the nature of the hottest DA white dwarfs’, doi
  53. (1987). Giant-scale supernova remnants - The role of differential galactic rotation and the formation of molecular clouds’,
  54. (2002). High-resolution observations of interstellar NaI and CaII towards the southern opening of the ‘Local Interstellar Chimney’: probing the disc-halo connection’, doi
  55. (1997). Hot White Dwarfs in the Extreme Ultraviolet Explorer Survey. doi
  56. (1998). Hot White Dwarfs in the Extreme-Ultraviolet Explorer Survey. doi
  57. (1995). Hot White Dwarfs in the Local Interstellar Medium: Hydrogen and Helium Interstellar Column Densities and Stellar Effective Temperatures from Extreme-Ultraviolet Explorer Spectroscopy’, doi
  58. (1995). Infrared ux excesses from hot subdwarfs.’, doi
  59. (1994). Insights into the ISM and the Spectral Evolution of White Dwarfs from
  60. (1995). Interaction of the Loop I supershell with the Local Hot Bubble’,
  61. (1975). Interstellar absorption lines in the spectrum of zeta Ophiuchi’, doi
  62. (1978). Interstellar absorption lines in the spectrum of Zeta Puppis’, doi
  63. (1979). Interstellar absorption of the extreme ultraviolet ux from two hot white dwarfs’,
  64. (1996). Interstellar Abundances from Absorption-Line Observations with the Hubble Space Telescope’, doi
  65. (1997). Interstellar and photospheric opacity from EUV spectroscopy of DA white dwarfs’, doi
  66. (1996). Interstellar Depletions Updated: Where All the Atoms Went’, doi
  67. (1999). Interstellar dust and magnetic eld at the boundaries of the Local Bubble. Analysis of polarimetric data in the light of HIPPARCOS parallaxes’,
  68. (1979). Interstellar extinction in the UV’, doi
  69. (1904). Investigations on the spectrum and orbit of delta Orionis.’, doi
  70. (1995). Local Cloud structure from HST-GHRS.’,
  71. (1991). Location and thickness of the nearest neutral gas cloud in the direction of Auriga-Perseus’,
  72. (1999). Mapping the contours of the Local bubble: preliminary results’, doi
  73. (1979). Masses and radii of white-dwarf stars. III - Results for 110 hydrogen-rich and 28 helium-rich stars’, doi
  74. (1995). Masses of DA white dwarfs with gravitational redshift determinations’, doi
  75. (1995). Non-LTE line-blanketed model atmospheres of hot stars. 1: Hybrid complete linearization/accelerated lambda iteration method’, doi
  76. (1979). O VI absorption in interstellar cloud surfaces’, doi
  77. (1988). Observations of interstellar absorption lines towards hot white dwarfs,
  78. (1895). On a great photographic nebula near Antares’, doi
  79. (1956). On a Possible Interstellar Galactic Corona.’, doi
  80. (1984). On the distribution of interstellar matter around the sun’, doi
  81. On the Spectra of Some of the Nebulae. And On the Spectra of Some of the Fixed Stars. [Abstract]’, Royal Society of London doi
  82. (2000). Overview of the Far Ultraviolet Spectroscopic Explorer Mission’, doi
  83. (1978). Physical processes in the interstellar medium, doi
  84. (2006). Probing the Atmospheres of Hot DA White Dwarfs with O VI, doi
  85. (2004). Probing the Disk-Halo Connection through the Local Interstellar Chimney, doi
  86. (1972). Proper motion survey of the south galactic pole’,
  87. (1999). Properties of Hot White Dwarfs in Extreme-Ultraviolet/Soft X-Ray Surveys’, doi
  88. (1993). Pulsar distances and the galactic distribution of free electrons’, doi
  89. (1990). Radiative magnetized thermal conduction fronts’, doi
  90. (1995). RE 0044+09: A new K dwarf rapid rotator with a white dwarf companion’, doi
  91. (2005). Results from a FUSE Survey of Hot White Dwarfs, doi
  92. (1995). ROSAT EUV observations of DA white dwarfs and late-type stars and the structure of the local interstellar medium’, doi
  93. (2008). Self-consistent interaction of neutrals and shocks in the local interstellar medium’, ArXiv e-prints . doi
  94. (1994). Spectroscopic, orbital, and physical properties of the binary Feige 24 and detection of transient He II absorption in the system’, doi
  95. (1995). Stellar evolution of low and intermediate-mass stars. I. Mass loss on the AGB and its consequences for stellar evolution.’, doi
  96. (1987). Supernovae versus models of the interstellar medium and the gaseous halo’, doi
  97. (1998). Temporal evolution of MHD shocks in the interstellar medium’, doi
  98. (2007). The Abundance of Interstellar Fluorine and Its Implications’, doi
  99. (2004). The Abundance of Interstellar Fluorine, doi
  100. (1935). The analysis of spectra and its application in astronomy (George Darwin Lecture, doi
  101. (1981). The detection of interstellar uorine in the line of sight toward Delta Scorpii’, doi
  102. (2003). The Deuterium-to-Oxygen Ratio in the Interstellar Medium’, doi
  103. (1982). The distribution of interstellar gas within 50pc of the Sun,
  104. (1998). The evolution of helium white dwarfs.
  105. (1990). The extreme ultraviolet spectrum of G191 - B2B and the ionization of the local interstellar medium’, doi
  106. (2006). The Far Ultraviolet Spectroscopic Explorer doi
  107. (1979). The gas dynamics of H II regions. II - Two-dimensional axisymmetric calculations’, doi
  108. (1999). The Global Structure and Evolution of a SelfGravitating Multiphase Interstellar Medium in a Galactic Disk’, ApJ 516, L13 L16. doi
  109. (1988). The highresolution soft X-ray spectrum of HZ 43. II - Bolometric X-ray ux, effective temperature, and radius’, doi
  110. (1975). The intercloud HI gas in the direction of Cassiopeia A and Cygnus A’,
  111. (1968). The interstellar radiation density between 912 A and 2400
  112. (2000). The Ionization of the Local Interstellar Medium as Revealed by Far Ultraviolet Spectroscopic Explorer doi
  113. (1989). The local Galactic magnetic eld’, doi
  114. (2007). The Local Interstellar Medium: Peculiar or doi
  115. (1969). The Lowell Suspect White Dwarfs’, doi
  116. (1993). The physics of pulsar scintillation., in ‘Royal Society Discussion Meeting: Pulsars as physics laboratories,
  117. (1998). The Soft X-ray Background Spectrum from DXS, doi
  118. (2008). The Solar Wind Charge-eXchange Contribution to the Local Soft X-ray Background’, Space Science Reviews doi
  119. (1988). The stellar radiation eld and the ionization of H and He in the local interstellar medium’, doi
  120. (2004). The Structure of the Local Interstellar Medium. doi
  121. (1990). The temperature scale of hot DA white dwarfs - Temperatures from far-ultraviolet continuum uxes’, doi
  122. (2000). The Three-dimensional Structure of the Warm Local Interstellar Medium. II. The Colorado Model of the Local Interstellar Cloud’, doi
  123. (1995). Theoretical White Dwarf Luminosity Functions: DA Models, in doi
  124. (1969). Thermal Properties of Interstellar Gas Heated by Cosmic Rays’, doi
  125. (1938). Unidentied Interstellar Lines in the Yellow and Red’, doi
  126. (1986). White Dwarfs in Wide Binaries - Part Two - Double Degenerates and Composite Spectra’, doi

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