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Discovery of slow X-ray pulsations in the high-mass X-ray binary 4U 2206+54
P. Reig, J. M Torrejon, I. Negueruela +3
The source 4U 2206+54 is one of the most enigmatic high-mass X-ray binaries. In spite of intensive searches, X-ray pulsations have not been detected in the time range 0.001-1000 s.…
The open cluster Pismis 11 and the very luminous blue supergiant HD 80077
Amparo Marco, Ignacio Negueruela
(Abridged) The very luminous blue supergiant HD 80077 has been claimed to be a member of the young open cluster Pismis 11, and hence a hypergiant. We obtained UBVRI photometry of t…
Stellar tracers of the Cygnus Arm. II: A young open cluster in Cam OB3
Ignacio Negueruela, Amparo Marco
Cam OB3 is the only defined OB association believed to belong to the Outer Galactic Arm or Cygnus Arm. Very few members have been observed and the distance modulus to the associati…
Optical properties of High-Mass X-ray Binaries (HMXB) in the Small Magellanic Cloud
M. J. Coe, R. H. D. Corbet, K. E. McGowan +6
The SMC represents an exciting opportunity to observe the direct results of tidal interactions on star birth. One of the best indicators of recent star birth activity is the presen…
Very peculiar wind from BD+53 2790, the optical counterpart to 4U 2206+54
P. Blay, M. Ribó, I. Negueruela
BD+53 2790, an O9.5Vp star, is the optical counterpart to the HMXRB 4U 2206+54. This system was classified initially as a BeX, but observational evidence soon stressed the need to…
INTEGRAL long-term monitoring of the Supergiant Fast X-ray Transient XTE J1739-302
P. Blay, S. Martínez-Núñez, I. Negueruela +6
In the past few years, a new class of High Mass X-Ray Binaries (HMXRB) has been claimed to exist, the Supergiant Fast X-ray Transients (SFXT). These are X-ray binary systems with a…
New very massive stars in Cygnus OB2
Ignacio Negueruela, Amparo Marco, Artemio Herrero +1
The compact association Cygnus OB2 is known to contain a large population of massive stars, but its total mass is currently a matter of debate. While recent surveys have uncovered…
Spectral distribution of Be/X-ray binaries in the Small Magellanic Cloud
V. A. McBride, M. J. Coe, I. Negueruela +2
The spectral distributions of Be/X-ray binaries in the Large Magellanic Cloud and Galaxy have been shown to differ significantly from the distribution of isolated Be stars in the G…
Westerlund 1 as a Template for Massive Star Evolution
Ignacio Negueruela, J. Simon Clark, Paul A. Crowther +1
With a dynamical mass M_dyn ~ 1.3x10e5 M_sun and a lower limit M_cl>5x10e4 M_sun from star counts, Westerlund 1 is the most massive young open cluster known in the Galaxy and thus…
Supergiant Fast X-ray Transients and Other Wind Accretors
Ignacio Negueruela, Jose Miguel Torrejon, Pablo Reig +2
Supergiant Fast X-ray Transients are obviously related to persistent Supergiant X-ray Binaries. Any convincing explanation for their behaviour must consistently take into account a…