271 citations · 4.9k across the 147 of their papers we have counts for
92 papers · 1 filter
Phase resolved spectroscopy of the accreting millisecond X-ray pulsar SAX J1808.4-3658 during the 2008 outburst
R. Cornelisse, P. D'Avanzo, T. Munoz-Darias +6
aims: We obtained phase-resolved spectroscopy of the accreting millisecond X-ray pulsar SAX J1808.4-3658 during its outburst in 2008 to find a signature of the donor star, constrai…
On the triple nature of the X-ray source 4U2129+47 (= V1727 Cyg)
M. S. Bothwell, M. P. Torres, M. R. Garcia +1
Context. In quiescence, the proposed optical counterpart to the neutron star low mass X-ray binary 4U 2129+47 (V1727 Cyg) shows a spectrum consistent with a late F-type subgiant an…
Bowen blend echo-tomography of low mass X-ray binaries
T. Muñoz-Darias, I. G. Martinez-Pais, J. Casares +7
We present simultaneous high time resolution (1-10 Hz) X-ray and optical observations of the persistent LMXBs Sco X-1 and V801 Ara(=4U 1636-536). In the case of Sco X-1 we find tha…
Unveiling the core of the Globular Cluster M15 in the Ultraviolet
A. Dieball, C. Knigge, D. R. Zurek +4
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 Sp…
Kinematical Studies of the Low Mass X-Ray Binary GR Mus (XB1254-690)
A. D. Barnes, J. Casares, R. Cornelisse +4
We present simultaneous high-resolution optical spectroscopy and X-ray data of the X-ray binary system GR Mus (XB1254-690), obtained over a full range of orbital phases. The X-ray…
Optical spectroscopy of the low mass X-ray binary GX9+9
R. Cornelisse, D. Steeghs, J. Casares +4
Phase-resolved medium resolution VLT spectroscopy of the low mass X-ray binary GX9+9 has revealed narrow CIII emission lines that move in phase relative to our new estimate of the…
Echoes from the companion star in Sco X-1
T. Muñoz-Darias, I. G. Martinez-Pais, J. Casares +5
We present simultaneous X-ray (RXTE) and optical (ULTRACAM) narrow band (Bowen blend/HeII and nearby continuum) observations of Sco X-1 at 2-10 Hz time resolution. We find that the…
IGR J16194-2810: a new symbiotic X-ray binary
N. Masetti, R. Landi, M. L. Pretorius +7
We here report on the multiwavelength study which led us to the identification of X-ray source IGR J16194-2810 as a new Symbiotic X-ray Binary (SyXB), that is, a rare type of Low M…
Detection of the Irradiated Donor in the LMXBs 4U 1636-536 (=V801 Ara) and 4U 1735-444 (=V926 Sco)
J. Casares, R. Cornelisse, D. Steeghs +4
Phase-resolved VLT spectroscopy of the bursting Low Mass X-ray Binaries 4U 1636-536/V801 Ara and 4U 1735-444/V926 Sco is presented. Doppler images of the NIII 4640 Bowen transition…
Simultaneous X-ray/optical observations of GX 9+9 (4U 1728-16)
A. K. H. Kong, P. A. Charles, L. Homer +2
We report on the results of the first simultaneous X-ray (RXTE) and optical (SAAO) observations of the luminous low mass X-ray binary (LMXB) GX 9+9 in 1999 August. The high-speed o…
A Long, Hard Look at the Low-Hard State in Accreting Black Holes
J. M. Miller, J. Homan, D. Steeghs +5
We present the first results of coordinated multi-wavelength observations of the Galactic black hole GX 339-4 in a canonical low-hard state, obtained during its 2004 outburst. XMM-…
On the Origin of the Absorption Features in SS433
A. D. Barnes, J. Casares, P. A. Charles +4
We present high-resolution optical spectroscopy of the X-ray binary system SS433, obtained over a wide range of orbital phases. The spectra display numerous weak absorption feature…
An ultracompact X-ray binary in the globular cluster M15 (NGC7078)
A. Dieball, C. Knigge, D. R. Zurek +5
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…
A "Combination Nova" Outburst in Z Andromedae: Nuclear Shell Burning Triggered by a Disk Instability
J. L. Sokoloski, S. J. Kenyon, B. R. Espey +11
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…
XMM Spectroscopy of the Transient Supersoft Source RX J0513.9-6951: probing the dynamic white dwarf photosphere
Katherine E. McGowan, Phil A. Charles, Alexander J. Blustin +3
The highly luminous (> 10^37 erg s^-1) supersoft X-ray sources (SSS) are believed to be Eddington limited accreting white dwarfs undergoing surface hydrogen burning. The current pa…
Doppler tomography of the transient X-ray binary Centaurus X-4 in quiescence
P. D'Avanzo, S. Campana, J. Casares +4
We present ESO-NTT low resolution spectroscopy of the neutron star X-ray transient Cen X-4 in quiescence over a complete orbital cycle. Our data reveal the presence of a K3-7 V com…
ULTRACAM observations of the black hole X-ray transient XTE J1118+480 in quiescence
T. Shahbaz, V. S. Dhillon, T. R. Marsh +5
We present high time-resolution multicolour observations of the quiescent soft X-ray transient XTE J1118+480 obtained with ULTRACAM. Superimposed on the double-humped continuum g'…
Multiband Echo Tomography of Sco X-1
T. Muñoz-Darias, I. G. Martínez-Pais, J. Casares +5
We present preliminary results of a simultaneous X-ray/optical campaign of the prototypical LMXB Sco X-1 at 1-10 Hz time resolution. Lightcurves of the high excitation Bowen/HeII e…
Fundamental Parameters of Low Mass X-ray Binaries II: X-Ray Persistent Systems
Jorge Casares, Phil Charles
The determination of fundamental parameters in X-ray luminous (persistent) X-ray binaries has been classically hampered by the large optical luminosity of the accretion disc. New m…
Periodic Variability During the X-ray Decline of 4U 1636-53
I. C. Shih, A. J. Bird, P. A. Charles +2
We report the onset of a large amplitude, statistically significant periodicity (~46 d) in the RXTE/ASM data of the prototype X-ray burster 4U 1636-53, the X-ray flux of which has…
Echo Tomography of Sco X-1 using Bowen Fluorescence Lines
J. Casares, T. Muñoz-Darias, I. G. Martinez-Pais +5
We present preliminary results of a simultaneous X-ray/optical campaign of the prototypical LMXB Sco X-1 at 1-10 Hz time resolution. Lightcurves of the high excitation Bowen/HeII e…
The X-ray source population of the globular cluster M15: Chandra high resolution imaging
D. C. Hannikainen, P. A. Charles, L. van Zyl +5
The globular cluster M15 was observed on three occasions with the High Resolution Camera on board Chandra in 2001 in order to investigate the X-ray source population in the cluster…
A New Kind of Nova
J. L. Sokoloski, S. J. Kenyon, A. K. H. Kong +10
We performed extensive, multi-wavelength observations of the prototypical symbiotic star Z Andromedae between 2000 and 2003, during a large eruption. The rise to optical maximum oc…
The massive neutron star or low-mass black hole in 2S0921-630
T. Shahbaz, J. Casares, C. Watson +4
We report on optical spectroscopy of the eclipsing Halo LMXB 2S0921-630, that reveals the absorption line radial velocity curve of the K0III secondary star with a semi-amplitude K_…