395 citations · 1.6k across the 31 of their papers we have counts for
32 papers
Spin-down of the accreting magnetar candidate 4U 0114+65: possible first evidence for a strong coupling regime
Graciela Sanjurjo-Ferrín, Jose Miguel Torrejón, Konstantin Postnov +3
4U~0114+65 is a high-mass X-ray binary composed of the B1\,Ia supergiant V*~V662~Cas and one of the slowest known accreting neutron stars, with a spin period of 9.4 ks. In 20…
Cyclical accretion regime change in the slow X-ray pulsar 4U 0114+65 observed with Chandra
Graciela Sanjurjo-Ferrín, Jose Miguel Torrejón, Konstantin Postnov +5
4U 0114+65 is a high-mass X-ray binary system formed by the luminous supergiant B1Ia, known as V{*} V662 Cas, and one of the slowest rotating neutron stars (NS) with a spin period…
Revealing the state transition of Cen X-3 at high spectral resolution with Chandra
Graciela Sanjurjo-Ferrín, Jose Miguel Torrejón, Lida Oskinova +4
Cen X-3 is a compact, high-mass X-ray binary (HMXRB), likely powered by Roche lobe overflow. We present a phase-resolved X-ray spectral and timing analysis of a target of opportuni…
X-Shooting ULLYSES: Massive Stars at Low Metallicity
Jorick S. Vink, Paul Crowther, Alex Fullerton +20
The Hubble Space Telescope has devoted 500 orbits to observing 250 massive stars with low metallicity in the ultraviolet (UV) range within the framework of the ULLYSES program. The…
X-ray variability of the HMXB Cen X-3: evidence for inhomogeneous accretion flows
Graciela Sanjurjo-Ferrín, Jose Miguel Torrejón, Konstantin Postnov +3
Cen X-3 is a compact high mass X-ray binary likely powered by Roche lobe overflow. We present a phase-resolved X-ray spectral and timing analysis of two pointed XMM-Newton observat…
Phase-dependent study of near-infrared disk emission lines in LB-1
Jifeng Liu, Zheng Zheng, Roberto Soria +19
The mass, origin and evolutionary stage of the binary system LB-1 has been the subject of intense debate, following the claim that it hosts an 70 black hole, in st…
Testing massive star evolution, star-formation history, and feedback at low metallicity: Photometric analysis of OB stars in the SMC Wing
Leah M. Fulmer, John S. Gallagher, Wolf-Rainer Hamann +2
The supergiant ionized shell SMC-SGS 1 (DEM 167), located in the outer Wing of the Small Magellanic Cloud (SMC), resembles structures that originate from an energetic star-formatio…
Coordinated UV and X-ray spectroscopic observations of the O-type giant xi Per: the connection between X-rays and large-scale wind structure
Derck Massa, Lida Oskinova, Raman Prinja +1
We present new, contemporaneous HST STIS and XMM observations of the O7 III(n)((f)) star xi Per. We supplement the new data with archival IUE spectra, to analyze the variability of…
Detection of magnetic field in the B2 star Oph A with ESO FORS2
I. Pillitteri, L. Fossati, N. Castro Rodriguez +2
Circumstantial evidence suggests that magnetism and enhanced X-ray emission are likely correlated in early B-type stars: similar fractions of them ( 10 %) are strong and hard…
XMM-Newton spectroscopy of the accreting magnetar candidate 4U0114+65
Graciela Sanjurjo, Jose Miguel Torrejon, Konstantin Postnov +3
4U011465 is one of the slowest known X-ray pulsars. We present an analysis of a pointed observation by the XMM-Newton X-ray telescope. The energy-resolved light curve, the time-…
ESO-Athena Synergy White Paper
P. Padovani, F. Combes, M. Diaz Trigo +29
The Advanced Telescope for High ENergy Astrophysics (Athena) is the X-ray observatory mission selected by ESA within its Cosmic Vision 2015-2025 programme to address the Hot and En…
The early B-type star Rho Oph A is an X-ray lighthouse
Ignazio Pillitteri, Scott J. Wolk, Fabio Reale +1
We present the results of a 140 ks XMM-Newton observation of the B2 star Ophiuchi A. The star has exhibited strong X-ray variability: a cusp-shaped increase of rate, similar to…
Low-luminosity stellar wind accretion onto neutron stars in HMXBs
Konstantin Postnov, Lida Oskinova, Jose Miguel Torrejón
Features and applications of quasi-spherical settling accretion onto rotating magnetized neutron stars in high-mass X-ray binaries are discussed. The settling accretion occurs in w…
Discovery of Rapidly Moving Partial X-ray Absorbers within gamma Cassiopeiae
K. Hamaguchi, L. Oskinova, C. M. P. Russell +4
Gamma Cassiopeiae is an enigmatic Be star with unusually strong hard X-ray emission. The Suzaku observatory detected six rapid X-ray spectral hardening events called "softness dips…
A Coordinated X-ray and Optical Campaign on the Nearest Massive Eclipsing Binary, Delta Ori Aa: I. Overview of the X-ray Spectrum
M. F. Corcoran, J. S. Nichols, H. Pablo +22
We present an overview of four phase-constrained Chandra HETGS X-ray observations of Delta Ori A. Delta Ori A is actually a triple system which includes the nearest massive eclipsi…
A Coordinated X-ray and Optical Campaign of the Nearest Massive Eclipsing Binary, delta Orionis Aa: III. Analysis of Optical Photometric MOST and Spectroscopic (Ground Based) Variations
Herbert Pablo, Noel D. Richardson, Anthony F. J. Moffat +44
We report on both high-precision photometry from the MOST space telescope and ground-based spectroscopy of the triple system delta Ori A consisting of a binary O9.5II+early-B (Aa1…
On X-ray pulsations in beta Cephei-type variables
L. M. Oskinova, H. Todt, D. P. Huenemoerder +4
Beta Cephei-type variables are early B-type stars that are characterized by oscillations observable in their optical light curves. At least one Beta Cep-variable also shows periodi…
A coordinated X-ray and Optical Campaign of the Nearest Massive Eclipsing Binary, Orionis Aa: IV. A multiwavelength, non-LTE spectroscopic analysis
T. Shenar, L. Oskinova, W. -R. Hamann +13
Eclipsing systems of massive stars allow one to explore the properties of their components in great detail. We perform a multi-wavelength, non-LTE analysis of the three components…
B fields in OB stars (BOB): on the detection of weak magnetic fields in the two early B-type stars beta CMa and epsilon CMa
L. Fossati, N. Castro, T. Morel +15
Within the context of the "B fields in OB stars (BOB)" collaboration, we used the HARPSpol spectropolarimeter to observe the early B-type stars beta CMa (HD44743; B1 II/III) and ep…
The born-again planetary nebula A78: an X-ray twin of A30
J. A. Toalá, M. A. Guerrero, H. Todt +8
We present the XMM-Newton discovery of X-ray emission from the planetary nebula (PN) A78, the second born-again PN detected in X-rays apart from A30. These two PNe share similar sp…
High-Energy Properties of the Enigmatic Be Star gamma Cassiopeiae
C. R. Shrader, K. Hamaguchi, S. J. Sturner +3
We present the results of a broad-band X-ray study of the enigmatic Be star Gamma Cassiopeiae (herein gamma Cas) based on observations made with both the Suzaku and INTEGRAL observ…
Expansion of hydrogen-poor knots in the born-again planetary nebulae A30 and A78
Xuan Fang, Martin A. Guerrero, Ramon A. Marquez-Lugo +8
We analyze the expansion of hydrogen-poor knots and filaments in the born-again planetary nebulae A30 and A78 based on Hubble Space Telescope (HST) images obtained almost 20 yr apa…
A Deep Chandra Observation of the Giant HII Region N11 I. X-ray Sources in the Field
Yael Naze, Q. Daniel Wang, You-Hua Chu +2
A very sensitive X-ray investigation of the giant HII region N11 in the LMC was performed using the Chandra X-ray Observatory. The 300ks observation reveals X-ray sources with lumi…
The Hot and Energetic Universe: A White Paper presenting the science theme motivating the Athena+ mission
Kirpal Nandra, Didier Barret, Xavier Barcons +237
This White Paper, submitted to the recent ESA call for science themes to define its future large missions, advocates the need for a transformational leap in our understanding of tw…