Browsing Physics (Scholarly Publications) by Author "ESPEY, BRIAN RUSSELL"
Now showing items 1-20 of 35
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[Alii] in the ultraviolet spectrum of the symbiotic star RR Telescopii
ESPEY, BRIAN RUSSELL (Blackwell, 1999)An inspection of a GHRS/HST spectrum of the symbiotic star RR Telescopii reveals the presence of the [Alii] 3s^2 ^1S - 3s3p ^3P_2 line at a vacuum wavelength of 2661.06+/-0.08?, 8.89+/-0.08? away from the Alii] 3s^2 ^1S - ... -
ASCA observations of the composite warm absorber in NGC 3516
ESPEY, BRIAN RUSSELL (American Astronomical Society, 1996)We obtained X-ray spectra of the Seyfert 1 galaxy NGC 3516 in 1995 March using the Japanese X-ray satellite, ASCA. Simultaneous far-UV observations were obtained with the Hopkins Ultraviolet Telescope on the Astro-2 shuttle ... -
A "combination nova" outburst in Z Andromedae: nuclear shell burning triggered by a disk instability
ESPEY, BRIAN RUSSELL (American Astronomical Society, 2006)We describe observational evidence for a new kind of interacting binary star outburst that involves both an accretion instability and an increase in thermonuclear shell burning on the surface of an accreting white dwarf. ... -
Contemporaneous ultraviolet and optical observations of direct and Raman-scattered O VI lines in symbiotic stars
ESPEY, BRIAN RUSSELL (American Astronomical Society, 2000)The optical spectra of some symbiotic binaries show two lines in the red region of the spectrum that cannot be identified with any known allowed or forbidden transitions. A case has been made that these lines are Raman-scattered ... -
EG and: Far ultraviolet spectroscopic explorer and Hubble space telescope STIS monitoring of an eclipsing symbiotic binary
ESPEY, BRIAN RUSSELL (American Astronomical Society, 2008)We present highlights and an overview of 20 FUSE and HST STIS observations of the bright symbiotic binary EG And. The main motivation behind this work is to obtain spatially resolved information on an evolved giant star ... -
Evolution of the ionizing background at high redshifts
ESPEY, BRIAN RUSSELL (1997)The decrease in number density of Lyman alpha clouds near the background quasar is an observational result that is often called the `proximity' or `inverse' effect. It is thought that, for nearby clouds, the flux of the ... -
Far ultraviolet spectroscopic explorer observations of the symbiotic star AG Draconis
ESPEY, BRIAN RUSSELL (American Astronomical Society, 2005)Spectra of the bright symbiotic star AG Draconis (BD +67?922) in the wavelength range 905-1187 ? obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) are presented. The spectra show a number of narrow, nebular ... -
Far-ultraviolet observations of NGC 3516 using the Hopkins ultraviolet telescope
ESPEY, BRIAN RUSSELL (American Astronomical Society, 1996)We observed the Seyfert 1 galaxy NGC 3516 twice during the flight of Astro-2 using the Hopkins Ultraviolet Telescope aboard the Space Shuttle Endeavour in March 1995. Simultaneous X-ray observations were performed with the ... -
Far-ultraviolet observations of NGC 4151 during the ORFEUS-SPAS II mission
ESPEY, BRIAN RUSSELL (American Astronomical Society, 1998)We observed the Seyfert 1 galaxy NGC 4151 on 11 occasions at 1-2 day intervals using the Berkeley spectrometer during the ORFEUS-SPAS II mission in 1996 November. The mean spectrum covers 912-1220 A at ~0.3 A resolution ... -
Far-ultraviolet spectra of broad absorption line QSOs and constraints on models for the ionization structure and metallicity of the BAL-region gas
ESPEY, BRIAN RUSSELL (American Astronomical Society, 1996)Hubble Space Telescope Faint Object Spectrograph G270H spectra of four moderate-to high-redshift broad absorption line (BAL) QSOs are presented. In addition, evidence is discussed that indicates that the gas that gives ... -
The far-ultraviolet spectrum of NGC 4151 as observed with the Hopkins ultraviolet telescope on Astro-2
ESPEY, BRIAN RUSSELL (American Astronomical Society, 1995)We observed NGC 4151 on six separate occasions at intervals of 1 to 3 days using the Hopkins Ultraviolet Telescope during the flight of Astro-2 aboard the space shuttle Endeavour in 1995 March. The far-UV spectra cover the ... -
Final Astro-2 calibration of the Hopkins Ultraviolet Telescope
ESPEY, BRIAN RUSSELL (University of Chicago Press, 1999)We present the ?nal calibration of the Hopkins Ultraviolet Telescope (HUT) for its ?ight during the Astro-2 space shuttle mission in 1995 March. Aspects of mission operations and instrument performance that a?ect data ... -
Forbidden emission lines of NE IV in the optical and ultraviolet spectra of gaseous nebulae
ESPEY, BRIAN RUSSELL (Blackwell, 1998)Recent R-matrix calculations of electron impact excitation rates in Ne IV are used to calculate emission line ratio-ratio diagrams involving both the UV (1602, 2422 and 2424 A) and optical (4714, 4716, 4724 and 4726 A) ... -
H-alpha emission lines in high-redshift quasars
ESPEY, BRIAN RUSSELL; Carswell, R. F.; Bailey, J. A.; Smith, M. G.; Ward, M. J. (1989)Infrared spectra have been obtained of the H-alpha lines in 18 medium- to high-redshift QSOs and optical spectra taken nearly simultaneously to measure the strong UV line. It is found that the H-alpha line is redshifted ... -
The HST absorption line key project. IX. Emission line studies of PG 2251+113
ESPEY, BRIAN RUSSELL (American Astronomical Society, 1994)We present Hubble Space Telescope (HST) and quasi-simultaneous ground-based observations of the z = 0.3252 QSO PG 2251113. We find a correlation between line widths and the critical density for de-excitation of the forbidden ... -
The HST quasar absorption line key project. 4: HST faint-object spectrograph and ground-based observations of the unusual low-redshift broad absorption-line quasi-stellar object PG 0043+039
ESPEY, BRIAN RUSSELL (American Astronomical Society, 1994)Hubble Space Telescope Faint Object Spectrograph (HST FOS) observations have shown that the spectrum of the low-redshift (zem approximately equal to 0.384) QSO PG 0043+039 exhibits weak broad absorption lines (BALs). The ... -
The Hubble deep field south: formulation of the observing campaign
ESPEY, BRIAN RUSSELL (University of Chicago Press, 2000)Deep, multiband observations of high Galactic latitude fields are an essential tool for studying topics ranging from Galactic structure to extragalactic background radiation. The Hubble Deep Field (HDF-N) observations ... -
The Hubble Deep Field South: STIS imaging
ESPEY, BRIAN RUSSELL (American Astronomical Society, 2000)We present the imaging observations made with the Space Telescope Imaging Spectrograph (STIS) of the Hubble Deep Field South. The field was imaged in four bandpasses: a clear CCD bandpass for 156 ks, a long-pass filter for ... -
A Hubble space telescope faint object spectrograph survey for broad absorption lines in a sample of low-redshift weak [O iii] quasi-stellar objects
ESPEY, BRIAN RUSSELL (1997)The study by Boroson & Meyers led to the suggestion that radio-quiet QSOs with weak [O III] and strong Fe II emission spectra form a class of QSOs that has a high probability of exhibiting broad absorption lines (BALs) in ... -
Hubble space telescope observations of the gravitationally lensed cloverleaf broad absorption line QSO H1413+1143: imaging
ESPEY, BRIAN RUSSELL (American Astronomical Society, 1996)An analysis of Hubble Space Telescope (HST) Wide Field Planetary Camera (WFPC) and Wide Field Planetary Camera 2 (WFPC2) images of the gravitationally lensed Cloverleaf broad absorption line quasi-stellar object (QSO) ...