Chandra ACIS Survey of M33 (ChASeM33): The enigmatic X-ray emission from IC131 (2009)
Tuellmann, R., Long, K. S., Pannuti, T. G., Winkler, P. F., Gaetz, T. J., Plucinsky, P. P., ...
We present the first X-ray analysis of the diffuse hot ionized gas and the point sources in IC131, after NGC604 the second most X-ray luminous giant HII region in M33. The X-ray emission is detected...
An ultracompact X-ray binary in the globular cluster NGC 1851 (2009)
Zurek, D. R., Knigge, C., Maccarone, T. J., Dieball, A., Long, K. S.
We present far-ultraviolet photometry obtained with the Hubble Space Telescope of the low-mass X-ray binary 4U 0513-40 in the globular cluster NGC 1851. Our observations reveal a clear, roughly...
Blue Hook Stars in Globular Clusters (2009)
Dieball, A., Knigge, C., Maccarone, T. J., Long, K. S., Hannikainen, D. C., Zurek, D., ...
Blue hook (BHk) stars are a rare class of horizontal branch stars that so far have been found in only very few Galactic globular clusters (GCs). The dominant mechanism for producing these objects is...
Servillat, M., Dieball, A., Webb, N. A., Knigge, C., Cornelisse, R., Barret, D., ...
Using new Chandra X-ray observations and existing XMM-Newton X-ray and Hubble far ultraviolet observations, we aim to detect and identify the faint X-ray sources belonging to the Galactic globular...
Multi-dimensional modelling of X-ray spectra for AGN accretion-disk outflows (2008)
Sim, S. A., Long, K. S., Miller, L., Turner, T. J.
We use a multi-dimensional Monte Carlo code to compute X-ray spectra for a variety of active galactic nucleus (AGN) disk-wind outflow geometries. We focus on the formation of blue-shifted absorption...
Hubble Space Telescope STIS Spectroscopy of Long Period Dwarf Novae in Quiescence (2008)
Sion, E. M., Gaensicke, B. T., Long, K. S., Szkody, P., Knigge, C., Hubeny, I., ...
We present the results of a synthetic spectral analysis of HST STIS spectra of five long period dwarf novae obtained during their quiescence to determine the properties of their white dwarfs which...
Unveiling the core of the Globular Cluster M15 in the Ultraviolet (2007)
Dieball, A., Knigge, C., Zurek, D. R., Shara, M. M., Long, K. S., Charles, P. A., ...
We have obtained deep far- (FUV) and near-ultraviolet (NUV) images of the inner region of the dense globular cluster M15 with the Advanced Camera for Surveys on board the Hubble Space Telescope. The...
High resolution Chandra X-ray imaging of the nucleus of M33 (2006)
Dubus, G., Charles, P. A., Long, K. S.
We show with a short Chandra HRC-S exposure that the powerful X-ray source coincident with the nucleus of M33 is unresolved at the highest spatial resolution available to date (0"4). The source flux...
High resolution Chandra X-ray imaging of the nucleus of M33 (2006)
Dubus, G., Charles, P. A., Long, K. S.
We show with a short Chandra HRC-S exposure that the powerful X-ray source coincident with the nucleus of M33 is unresolved at the highest spatial resolution available to date (0"4). The source flux...
High resolution Chandra X-ray imaging of the nucleus of M33 (2006)
Dubus, G., Charles, P. A., Long, K. S.
We show with a short Chandra HRC-S exposure that the powerful X-ray source coincident with the nucleus of M33 is unresolved at the highest spatial resolution available to date (0"4). The source flux...
Williams, Brian J., Borkowski, K. J., Reynolds, S. P., Blair, W. P., Ghavamian, P., Hendrick, S. P., ...
We report observations with the MIPS instrument aboard the {\it Spitzer Space Telescope} (SST) of four supernova remnants (SNRs) believed to be the result of core-collapse SNe: N132D (0525-69.6),...
M 33 X-7: ChASeM33 reveals the first eclipsing black hole X-ray binary (2006)
Pietsch, W., Haberl, F., Sasaki, M., Gaetz, T. J., Plucinsky, P. P., Ghavamian, P., ...
The first observations conducted as part of the Chandra ACIS survey of M 33 (ChASeM33) sampled the eclipsing X-ray binary M 33 X-7 over a large part of the 3.45 d orbital period and have resolved...
Godon, P., Sion, E. M., Cheng, F., Long, K. S., Gaensicke, B. T., Szkody, P.
We present the last HST/STIS E140M FUV spectrum (1150-1725A) of the dwarf nova (DN) WZ Sge, obtained in July 2004, 3 years following the early superoutburst of July 2001. Single white dwarf (WD)...
M33 X-7: ChASeM33 reveals the first eclipsing black hole X-ray binary (2006)
Pietsch, W., Haberl, F., Sasaki, M., Gaetz, T. J., Plucinsky, P. P., Ghavamian, P., ...
Knigge, C., Gilliland, R. L., Dieball, A., Zurek, D. R., Shara, M. M., Long, K. S.
We show that the X-ray source W31 in the core of the globular cluster 47 Tucanae is physically associated with the bright blue straggler BSS-7. The two sources are astrometrically matched to...
An ultracompact x-ray binary in the Globular Cluster M15 (NGC 7078) (2005)
Dieball, A., Knigge, C., Zurek, D.R., Shara, M.M, Long, K.S., Charles, P. A., ...
We have used the Advanced Camera for Surveys on board the Hubble Space Telescope to image the core of the globular cluster M15 in the far-ultraviolet (FUV) wave band. Based on these observations, we...
FUSE and HST/STIS far-ultraviolet observations of AM Herculis in an extended low state (2005)
Gaensicke, B. T., Long, K. S., Barstow, M. A., Hubeny, I.
We have obtained FUSE and HST/STIS time-resolved spectroscopy of the polar AM Herculis during a deep low state. The spectra are entirely dominated by the emission of the white dwarf. Both the...
An ultracompact X-ray binary in the globular cluster M15 (NGC7078) (2005)
Dieball, A., Knigge, C., Zurek, D. R., Shara, M. M., Long, K. S., Charles, P. A., ...
We have used the Advanced Camera for Surveys on board the Hubble Space Telescope to image the core of the globular cluster M15 in the far-ultraviolet (FUV) waveband. Based on these observations, we...
Ultraviolet studies of interacting binaries (2005)
Gaensicke, B. T., De Martino, D., Marsh, T. R., Haswell, C. A., Knigge, C., Long, K. S., ...
Interacting Binaries consist of a variety of stellar objects in different stages of evolution and those containing accreting compact objects still represent a major challenge to our understanding of...
2-D Monte Carlo simulations of H I line formation in massive YSO disk winds (2005)
Sim, S. A., Drew, J. E., Long, K. S.
Massive young stellar objects (YSOs) are powerful infrared H I line emitters. It has been suggested that these lines form in a outflow from a disk surrounding the YSO. Here, new two-dimensional Monte...
Spiral waves and the secondary in the novalike variable, V3885 Sgr (2005)
Hartley, L. E., Murray, J. R., Drew, J. E., Long, K. S.
We present seven nights' blue spectroscopy of the novalike variable star, V3885 Sgr. The line spectrum shows a typical combination of broad absorption and emission in H gamma and H beta and He I,...
The masses, radii and luminosities of the components of U Geminorum (2005)
Naylor, T., Allan, A., Long, K. S.
We present a phase-resolved spectroscopic study of the secondary star in the cataclysmic variable U Gem. We use our data to measure the radial velocity semi-amplitude, systemic velocity and...
Dieball, A., Knigge, C., Zurek, D. R., Shara, M. M., Long, K. S.
We present a reanalysis of far-ultraviolet (FUV) observations of the globular cluster NGC 2808 obtained with the Hubble Space Telescope. These data were first analyzed by Brown and coworkers, with an...
The Far-Ultraviolet Spectrum of Z Camelopardalis in Quiescence and Standstill. (2005)
Hartley, L.E., Long, K.S., Froning, C.S., Drew, J.E.
Original article can be found at: http://www.iop.org/EJ/journal/apj Copyright American Astronomical Society. DOI: 10.1086/428375 [Full text of this article is not available in the UHRA]
Far-ultraviolet Spectroscopy of Magnetic Cataclysmic Variables (2004)
Araujo-Betancor, S., Gaensicke, B. T., Long, K. S., Beuermann, K., De Martino, D., Sion, E. M., ...
We have obtained HST/STIS data for a total of eleven polars as part of a program aimed to compile a homogeneous database of high-quality far-ultraviolet (FUV) spectra for a large number of...
High resolution Chandra X-ray imaging of the nucleus of M33 (2004)
Dubus, G., Charles, P. A., Long, K. S.
We show with a short Chandra HRC-S exposure that the powerful X-ray source coincident with the nucleus of M33 is unresolved at the highest spatial resolution available to date (0"4). The source flux...
Knigge, C., Zurek, D. R., Shara, M. M., Long, K. S., Gilliland, R. L., Charles, P. A.
Far-ultraviolet (FUV) observations with the Hubble Space Telescope are an excellent way to find and study the hot, blue stellar populations in the cores of globular clusters. These populations...
High resolution Chandra X-ray imaging of the nucleus of M33 (2004)
Dubus, G., Charles, P. A., Long, K. S.
We show with a short Chandra HRC-S exposure that the powerful X-ray source coincident with the nucleus of M33 is unresolved at the highest spatial resolution available to date (0"4). The source flux...
Charles , P. A., Gilliland , R. L., Knigge , C., Long , K. S., Shara , M. M., Zurek , D. R.
Las observaciones en el ultravioleta lejano (FUV) con el Telescopio Espacial Hubble (HST) proporcionan un excelente camino para encontrar y estudiar las poblaciones de estrellas azules y calientes en...
Welsh, W. F., Sion, E. M., Godon, P., Gansicke, B. T., Knigge, C., Long, K. S., ...
We present a time series analysis of Hubble Space Telescope observations of WZ Sge obtained in 2001 September, October, November and December as WZ Sge declined from its 2001 July superoutburst....
Hubble Space Telescope Observations of the Nova-Like Cataclysmic Variable V348 Puppis (2003)
Froning, C. S., Long, K. S., Baptista, R.
We present time series UV and optical (1150 -- 8000 A) spectrophotometry of the novalike (NL) cataclysmic variable V348 Pup through and after eclipse. Outside of eclipse, the spectrum is...
HST/STIS Spectroscopy of the Intermediate Polar EX Hydrae (2003)
Belle, K. E., Howell, S. B., Sion, E. M., Long, K. S., Szkody, P.
We present the results of our analysis of six orbits of HST/STIS time-tagged spectroscopy of the intermediate polar, EX Hydrae. The high time and wavelength resolution of the HST/STIS spectra...
A far-ultraviolet survey of 47 Tucanae. I. Imaging (2002)
Knigge, C, Zurek, D.R., Shara, M.M., Long, K.S.
We present results from the imaging portion of a far-ultraviolet (FUV) survey of the core of 47 Tucanae. We have detected 767 FUV sources, 527 of which have optical counterparts in archival HST/WFPC2...
Modeling the spectral signatures of accretion disk winds: a new Monte Carlo approach (2002)
Bipolar outflows are present in many disk-accreting astrophysical systems. In disk-accreting cataclysmic variables (CVs), these outflows are responsible for most of the strong features in the...
Knigge, C., Hynes, R. I., Steeghs, D., Long, K. S., Araujo-Betancor, S., Marsh, T. R.
We report the discovery of 15-s oscillations in ultraviolet observations of WZ Sge obtained with the Hubble Space Telescope approximately one month after the peak of the 2001 outburst. This is the...
Froning, C. S., Long, K. S., Knigge, C.
We present far-ultraviolet (905 -- 1182 A), time-series spectroscopy of the eclipsing, novalike cataclysmic variable, UX UMa, acquired with FUSE. The time-averaged spectrum is complex and is...
The system parameters of DW Ursae Majoris (2002)
Araujo-Betancor, S., Knigge, C., Long, K. S., Hoard, D. W., Szkody, P., Rodgers, B., ...
We present new constraints on the system parameters of the SW Sextantis star DW Ursae Majoris, based on ultraviolet (UV) eclipse observations with the Hubble Space Telescope. Our data were obtained...
QU Car: a very high luminosity nova-like binary with a carbon-enriched companion (2002)
Drew, J. E., Hartley, L. E., Long, K. S.
QU Car is listed in cataclysmic variable star catalogues as a nova-like variable. This little-studied, yet bright interacting binary is re-appraised here in the light of new high-quality ultraviolet...
Time-resolved ultraviolet spectroscopy of the compact interacting binary QU Car (2002)
Hartley, L. E., Drew, J. E., Long, K. S.
We present HST/STIS (1160--1700A) echelle spectra of the cataclysmic variable (CV) star, QU Car, observed in time-tag mode at three epochs. In catalogues this binary is classified as a nova-like...
Results of Fort Carson, Colorado Terrain Dust Obscuration Tests Using Explosives. (2002)
Long,K. S., Mason,J. B., Durst,B. P.
The US Army Engineer Waterways Experiment Station (WES) conducted explosive dust obscuration measurements at Fort Carson, Col., in April and August 1983 to demonstrate the validity of WES volumetric...
The evolution of disks and winds in dwarf novae outbursts. (2002)
Froning, C.S., Long, K.S., Drew, J.E., Knigge, C., Proga, D., Mattei, J.A.
Hartley, L. E., Drew, J. E., Long, K. S., Knigge, C., Proga, D.
To confront the predictions of the most recent line-driven disk wind models with observational evidence, we have obtained HST STIS (1180--1700A) echelle spectra of the nova-like variables IX Vel and...
The Evolution of Disks and Winds in Dwarf Novae Outbursts (2001)
Froning, C. S., Long, K. S., Drew, J. E., Knigge, C., Proga, D., Mattei, J. A.
Far ultraviolet (FUV) observations are excellent probes of the inner accretion disk, disk outflows, and the mass-accumulating white dwarf in cataclysmic variables. Here we study the contrasting...
FUSE Observations of U Geminorum During Outburst and Decline (2001)
Froning, C. S., Long, K. S., Drew, J. E., Knigge, C., Proga, D.
We have obtained FUV (904 -- 1187 \AA) spectra of U Gem in outburst with FUSE. Three of the observations were acquired during the plateau phase of the outburst, while the fourth was obtained during...
FUSE Observations of U Geminorum during Outburst and Decline. (2001)
Froning, C.S., Long, K.S., Drew, J.E., Knigge, C., Proga, D.
Original article can be found at: http://www.iop.org/EJ/journal/apj Copyright American Astronomical Society. DOI: 10.1086/323860 [Full text of this article is not available in the UHRA]
A Far-Ultraviolet Spectroscopic Survey of the Globular Cluster 47 Tuc (2000)
Knigge, C., Shara, M. M., Zurek, D. R., Long, K. S., Gilliland, R. L.
We present preliminary results from a FUV spectroscopic and photometric survey of the globular cluster 47 Tuc. Our main goal is to either confirm or rule out the existence of a large population of...
HST-STIS Observations of the Cygnus Loop: Spatial Structure of a Non-radiative Shock (2000)
Sankrit, Ravi, Blair, W. P., Raymond, J. C., Long, K. S.
We present a spatially-resolved ultraviolet spectrum of a non-radiative shock front in the Cygnus Loop, obtained with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space...
A Self-Occulting Accretion Disk in the SW Sex Star DW UMa (2000)
Knigge, C., Long, K. S., Hoard, D. W., Szkody, P., Dhillon, V. S.
We present the ultraviolet spectrum of the SW Sex star and nova-like variable DW UMa in an optical low state, as observed with the Space Telescope Imaging Spectrograph on board the Hubble Space...
Puromycin-rRNA interaction sites at the peptidyl transferase center (2000)
Rodriguez-Fonseca, C., Phan, H., Long, K. S., Porse, B. T., Kirillov, S. V., Amils, R., ...
The Compact UV Nucleus of M33 (1999)
Dubus, G., Long, K. S., Charles, P. A.
The most luminous X-ray source in the Local Group is associated with the nucleus of M33. This source, M33 X-8, appears modulated by ~20% over a ~106 day period, making it unlikely that the combined...
Multiwavelength superoutburst observations of T Leonis (1999)
Howell, S.B., Ciardi, D.R., Szkody, P., Paradijs, J.A. Van, Kuulkers, E., Cash, J., ...
MINDS: A New Approach to the Information Security Process (1998)
Eilertson, E. E., Ertoz, L., Kumar, V., Long, K. S.
This paper describes the work the University of Minnesota is doing with the U.S. Army Research Laboratory to advance the state-of-the-art in network intrusion detection. The Minnesota Network...
The eclipsing X-ray pulsar X-7 in M33 (1998)
Dubus, G., Charles, P. A., Long, K. S., Hakala, P. J., Kuulkers, E.
Using our extensive ROSAT X-ray observations of M33, we confirm a 3.45 day eclipse period for the Einstein source X-7 (Larson & Schulman, 1997) and discover evidence for a 0.31-s pulse period. The...
Baptista, R., Horne, K., Wade, R. A., Hubeny, I., Long, K. S., Rutten, R. G. M.
Time-resolved eclipse spectroscopy of the nova-like variable UX UMa obtained with the HST/FOS on 1994 August and November is analyzed with eclipse mapping techniques to produce spatially resolved...
HST/FOS Eclipse Observations of the Nova-like Cataclysmic Variable UX Ursae Majoris (1998)
Knigge, C., Long, K. S., Wade, R. A., Baptista, R., Horne, K., Hubeny, I., ...
[abridged abstract] We present and analyze Hubble Space Telescope observations of the eclipsing nova-like cataclysmic variable UX UMa obtained with the Faint Object Spectrograph. Two eclipses each...
Knigge, C., Drake, N., Long, K. S., Wade, R. A., Horne, K., Baptista, R.
[abridged abstract] Low amplitude (~=0.5%) 29-s oscillations have been detected in HST/FOS eclipse observations of the nova-like cataclysmic variable UX UMa. These are the same dwarf nova-type...
A 106-d period in the nuclear source X-8 in M33 (1997)
Dubus, G., Charles, P. A., Long, K. S., Hakala, P. J.
With an X-ray luminosity of about 10^39 erg/s, the source X-8 coincident with the optical center of M33 is the most luminous X-ray source in the Local Group. However, its nature remains a mystery. We...
Hopkins Ultraviolet Telescope Observations of Her X-1 (1997)
Boroson, B., Blair, W. P., Davidsen, A. F., Vrtilek, S. D., Raymond, J., Long, K. S., ...
We have obtained a far-ultraviolet spectrum of the X-ray binary Hercules X-1/HZ Herculis using the Hopkins Ultraviolet Telescope aboard the Astro-1 space shuttle mission in 1990 December. This is the...
Green, C D, Long, K S, Shi, H, Wolin, S L
The 60-kDa Ro autoantigen is normally complexed with small cytoplasmic RNAs known as Y RNAs. In Xenopus oocytes, the Ro protein is also complexed with a large class of variant 5S rRNA precursors that...
Puromycin-rRNA interaction sites at the peptidyl transferase center.
Rodriguez-Fonseca, C, Phan, H, Long, K S, Porse, B T, Kirillov, S V, Amils, R, ...
The binding site of puromycin was probed chemically in the peptidyl-transferase center of ribosomes from Escherichia coli and of puromycin-hypersensitive ribosomes from the archaeon Haloferax...
Long, K S, Cedervall, T, Walch-Solimena, C, Noe, D A, Huddleston, M J, Annan, R S, ...
An abundant nuclear phosphoprotein, the La autoantigen, is the first protein to bind all newly synthesized RNA polymerase III transcripts. Binding by the La protein to the 3' ends of these RNAs...
Green, C D, Long, K S, Shi, H, Wolin, S L
The 60-kDa Ro autoantigen is normally complexed with small cytoplasmic RNAs known as Y RNAs. In Xenopus oocytes, the Ro protein is also complexed with a large class of variant 5S rRNA precursors that...
Puromycin-rRNA interaction sites at the peptidyl transferase center.
Rodriguez-Fonseca, C, Phan, H, Long, K S, Porse, B T, Kirillov, S V, Amils, R, ...
The binding site of puromycin was probed chemically in the peptidyl-transferase center of ribosomes from Escherichia coli and of puromycin-hypersensitive ribosomes from the archaeon Haloferax...
Long, K S, Cedervall, T, Walch-Solimena, C, Noe, D A, Huddleston, M J, Annan, R S, ...
An abundant nuclear phosphoprotein, the La autoantigen, is the first protein to bind all newly synthesized RNA polymerase III transcripts. Binding by the La protein to the 3' ends of these RNAs...