Astrophysics in the Extreme Ultraviolet : Proceedings of Colloquium No. 152 of the International Astronomical Union, Held in Berkeley, California, March 27–30, 1995

From the beginning of Space Astronomy, the Extreme Ultraviolet band of the spectrum (roughly defined as the decade in energy from 90-900 Å) was deemed to be the `unobservable ultraviolet'. Pioneering results from an EUV telescope on the Apollo-Soyuz Mission in 1975 forcibly demonstrated that this view was incorrect; but it required the all-sky surveys of the English Wide-Field Camera and the Extreme Ultraviolet Explorer to demonstrate the broad potential of this field. Over 700 EUV sources have now been detected. Over 150 researchers from 16 countries gathered to share results in this new field at the International Astronomical Union Colloquium No. 152. Papers were presented on a wide variety of topics including cool star coronae, white dwarf atmospheres and evolution, neutron stars, the Io torus, cataclysmic variable stars, active galactic nuclei, the interstellar medium, winds and atmospheres of early type stars, and EUV plasma diagnostics. Selected manuscripts from this meeting are provided in these Conference Proceedings. Front Matter....Pages i-xxii Results from the ROSAT EUV Wide Field Camera....Pages 1-4 Results from the Second EUVE Source Catalog....Pages 5-6 EUV Astrophysics with ALEXIS : The Wide View....Pages 7-14 Temporal Behaviour of Sources in the ROSAT Extreme-Ultraviolet All-Sky Survey....Pages 15-19 EUV Observation with Normal Incidence Multilayer Telescopes....Pages 21-26 Active Galactic Nuclei in the Extreme Ultraviolet....Pages 27-36 Discovery of Warm Gas in the Virgo Cluster....Pages 37-43 EUV and Soft X-ray Evidence for Partially Ionized Gas in Active Galactic Nuclei....Pages 45-49 Line Emission from Warm Material in NGC 5548....Pages 51-55 Extreme Ultraviolet Spectroscopy of the Seyfert 1 Galaxy Markarian 478....Pages 57-61 Variability and Spectra of AGN in the EUV and the Relation to Other Bands....Pages 63-67 X-Ray Selected EUV Galaxies: A Quest for the Faintest Extragalactic EUV Sources....Pages 69-73 EUVE Observations of the Seyfert Galaxy MRK 279....Pages 75-80 EUVE Spectra of Coronae and Flares....Pages 81-88 Cool Stars in the EUV: Spectral and Structural Variability....Pages 89-96 The FIP Effect and Abundance Anomalies in Late-Type Stellar Coronae....Pages 97-104 Dissecting the EUV Spectrum of Capella....Pages 105-112 Hot Times in the Hertzsprung Gap....Pages 113-120 Are Some Stellar Coronae Optically Thick?....Pages 121-128 EUVE Observations of AR Lacertae: The Differential Emission Measure and Evidence for Extended Prominences....Pages 129-133 EUVE Observations of BY Dra Systems....Pages 135-140 High Temperature Structure in Cool Binary Stars....Pages 141-145 A Re-Analysis of the X-ray Spectrum of HR 1099 and Its Implications for Coronal Abundances....Pages 147-151 Continued Analysis of EUVE and Optical Observations of a Flare on AD Leonis....Pages 153-158 Spectroscopic EUVE Observations of the Active Star AB Doradus....Pages 159-164 A Search for Rotational Modulation in the EUV Emission from AB Doradus....Pages 165-169 EUV Emission Sources in Gas-Dynamic Models of Stellar Flares....Pages 171-174 Post-Eruptive Flare Energy Release as Detected on AU Mic by EUVE ....Pages 175-180 The EUV Flux of Chromospherically Active Binary Stars....Pages 181-182 A Catalogue of Ultraviolet Observations of Chromospherically Active Binary Stars....Pages 183-184 New Developments in Hot White Dwarf Models....Pages 185-192 The Hot White Dwarf Population in the EUVE Survey....Pages 193-202 The Composition and Structure of White Dwarf Atmospheres Revealed by Extreme Ultraviolet Spectroscopy....Pages 203-210 Equilibrium Abundances of Heavy Elements Supported by Radiative Levitation in the Atmospheres of Hot DA White Dwarfs....Pages 211-215 A Spectroscopic Survey in the EUV of the “Coolest” Hot DA Stars....Pages 217-222 The Metallicity of Hot DA White Dwarfs as Inferred from EUV Photometry....Pages 223-228 Confining the Edges of the GW Vir Instability Strip....Pages 229-234 Detection of Heavy Elements in the EUVE Spectrum of a Hot White Dwarf....Pages 235-240 EUVE and ORFEUS Observations of the Cool DO White Dwarf HD 149499 B....Pages 241-246 Guide to Modeling the Interstellar Medium....Pages 247-254 New Insights on the Interstellar Medium from EUV Observations....Pages 255-260 The Morphology and Physics of the Local Interstellar Medium....Pages 261-268 Observations of Diffuse Emission from the Hot ISM....Pages 269-275 ALEXIS Observations of the Diffuse Cosmic Background in the Extreme Ultraviolet....Pages 277-282 A Search for the Signature of the Diffuse Soft X-ray Background in the ROSAT Wide-Field Camera All-Sky Survey....Pages 283-287 Features of the Soft X-ray Background and Implications for the EUV Background....Pages 289-293 The Interstellar Gas in the Line of Sight to ε Canis Majoris....Pages 295-298 The EUVE Observations of Dwarf Novae....Pages 299-299 Extreme Ultraviolet Spectroscopy of Magnetic Cataclysmic Variables....Pages 301-308 EUVE Photometry of SS Cygni: Dwarf Nova Outbursts and Oscillations....Pages 309-316 The EUV Excess in Magnetic Cataclysmic Variables....Pages 317-324 EUVE Spectrophotometry of QS Tel: The Second Pole Becomes Active....Pages 325-329 Non-Magnetic Cataclysmic Variables in the ROSAT WFC Survey....Pages 331-335 The Three-Dimensional Structure of EUV Accretion Regions of AM Her Stars: Analysis of EUVE Light Curves....Pages 337-341 EUVE and VLA Observations of the Eclipsing Pre-Cataclysmic Variable V471 Tauri....Pages 343-348 Model Spectra for Accretion Disks Truncated at the Inner Edge....Pages 349-354 The Unusual UV Spectra of EUV-Discovered AM Herculis Stars....Pages 355-359 EUV Radiation from B Stars: The Broad Implications for Stellar and Interstellar Astronomy....Pages 361-365 Ionization in the Winds of Early-B Stars: Constraints Imposed by EUVE ....Pages 367-374 EUV Radiation from Hot Star Photospheres: Theory Versus Observations....Pages 375-379 Photospheric Variability in EUVE Observations of β Canis Majoris (B1 II-III)....Pages 381-388 EUV/Soft X-ray Emission from Classical Novae....Pages 389-394 Modelling the Soft X-Ray and EUV Emission in Classical Novae: EUVE and ROSAT Observations of V1974 Cygni....Pages 395-400 Novae and Helium Novae As Bright EUV Sources....Pages 401-405 The Hot Winds of Novae....Pages 407-411 The X-ray and EUV Turnoff of GQ Mus and V1974 Cyg....Pages 413-417 EUV Constraints on Models of Low Mass X-Ray Binaries....Pages 419-424 An EUVE Detection of a Low-Mass X-ray Binary? AC211 in M15....Pages 425-429 Extreme Ultraviolet Emission from Neutron Stars....Pages 431-435 EUV/Soft X-ray Spectra for Low B Neutron Stars....Pages 437-442 EUV Studies of Solar System Objects: A Status Report....Pages 443-447 Three-Dimensional Modelling of EUVE Observations of the Io Plasma Torus....Pages 449-456 ALEXIS Lunar Observations....Pages 457-464 RE J1255+266—Detection of an Extremely Bright EUV Transient....Pages 465-470 The Secrets of EUVE J2056-17.1....Pages 471-474 Searching EUVE Data for Transient/Flaring Extreme Ultraviolet Sources....Pages 475-479 The ALEXIS Point Source Detection Effort....Pages 481-484 The EUVE Optical Identification Campaign II: Late-Type and White Dwarf Stars....Pages 485-489 An Optical Study of the Field of EUVE J1027+323: Discovery of a QSO and a Hidden Hot White Dwarf....Pages 491-496 Recent Advances in EUV Solar Astronomy....Pages 497-502 Looking for the FIP Effect in EUV Spectra: Examining the Solar Case....Pages 503-510 The Sun in Time: Evolution of Coronae of Solar-Type Stars....Pages 511-518 Fe XIII Emission Lines Observed by EUVE and the S082A Instrument On-Board Skylab ....Pages 519-524 Solar EUV Rocket Telescope and Spectrograph (SERTS) Observations of Fe XII Emission Lines....Pages 525-529 Skylab Observations of Temperature and Density Sensitive Emission Line Ratios in Ne VI....Pages 531-536 The Arcetri Spectral Code for Optically-Thin Plasmas....Pages 537-541 DEM Analyses with the Utrecht Codes....Pages 543-552 Plasma Emission Codes: Comparisons and Critiques....Pages 553-560 The Opacity Project and the Iron Project....Pages 561-568 The Iron Project: Atomic Data for Fe I-Fe VI....Pages 569-576 EUV Line Intensities of Fe X....Pages 577-581 Diagnostics of EUV Spectral Emission from Boron-like Ions....Pages 583-587 Line Ratio Diagnostics Applicable to Astronomical Spectra in the 50-3000 Å Wavelength Region....Pages 589-593 The EUVE Guest Investigator Science Program....Pages 595-596 The Extreme Ultraviolet Explorer Public Right Angle Program....Pages 597-598 The Berkeley Spectrometer for ORFEUS: Laboratory and In-Flight Performance....Pages 599-600 An Instrument to Study the Diffuse EUV Astronomical Background....Pages 601-609 Back Matter....Pages 611-616 ....Pages 617-620