312 citations · 6.5k across the 153 of their papers we have counts for
6 papers · 1 filter
Massive X-ray binaries: New developments in the INTEGRAL era
Ignacio Negueruela
The study of massive X-ray binaries provides important observational diagnostics for a number of fundamental astrophysical issues, such as the evolution of massive stars, the stell…
Be/X-ray binaries: An observational approach
Ignacio Negueruela
Be/X-ray binaries are the most numerous class of X-ray binaries. They constitute an excellent tracer of star formation and can be used to study several aspects of astrophysics, fro…
A Period and a Prediction for the Of?p Spectrum Alternator HD 191612
Nolan R. Walborn, Ian D. Howarth, Gregor Rauw +7
The observational picture of the enigmatic O-type spectrum variable HD191612 has been sharpened substantially. A symmetrical, low-amplitude light curve with a period near 540 d has…
On the class of Oe stars
Ignacio Negueruela, Iain A. Steele, Guillem Bernabeu
We present high-quality spectra of the majority of stars that have been classified as Oe and find that their published spectral types are generally too early, most likely due to in…
Evidence for a Neutron Star in the non-pulsating massive X-ray binary 4U2206+54
J. M. Torrejón, I. Kreykenbohm, A. Orr +2
We present an analysis of archival RXTE and BeppoSAX data of the X-ray source 4U2206+54 . For the first time, high energy data (> 30 kev) are analyzed for this source. The data are…
A Search for Luminous Be stars
Ignacio Negueruela
As Be stars are restricted to luminosity classes III-V, but early B-type stars are believed to evolve into supergiants, it is to be expected that the Be phenomenon disappears at so…