126 citations · 416 across the 13 of their papers we have counts for
13 papers
Astrophysical parameters of LS 437 and the nature of X0726-260
Ignacio Negueruela, Sara R. Berlanas, Lee J. Townsend +2
Be/X-ray binaries, the most common class of high-mass X-ray binaries, are characterised by OBe companions, but display a rich variety of X-ray behaviours. One of the most atypical…
MONOS: Multiplicity Of Northern O-type Spectroscopic systems. I. Project description and spectral classifications and visual multiplicity of previously known objects
J. Maíz Apellániz, E. Trigueros Páez, I. Negueruela +14
[ABRIDGED] AIMS. MONOS is collecting information and studying O-type spectroscopic binaries with delta > -20 deg. In this 1st paper we describe the sample and provide spectral clas…
The massive multiple system HD 64315
J. Lorenzo, S. Simon-Diaz, I. Negueruela +4
The O6 Vn star HD 64315 is believed to belong to the star-forming region known as NGC 2467, but previous distance estimates do not support this association. We explore the multiple…
GU Mon, a high-mass eclipsing overcontact binary in the young open cluster Dolidze 25
J. Lorenzo, I. Negueruela, F. Vilardell +3
Context. The eclipsing binary GU Mon is located in the star-forming cluster Dolidze 25, which has the lowest metallicity measured in a Milky Way young cluster. Aims. GU Mon has bee…
Open cluster Dolidze 25: Stellar parameters and the metallicity in the Galactic Anticentre
Ignacio Negueruela, Sergio Simón-Díaz, Javier Lorenzo +2
The young open cluster Dolidze 25, in the direction of the Galactic Anticentre, has been attributed a very low metallicity, with typical abundances between and dex be…
The little-studied cluster Berkeley 90. I. LS III +46 11: a very massive O3.5 If* + O3.5 If* binary
J. Maíz Apellániz, I. Negueruela, R. H. Barbá +9
Context: It appears that most (if not all) massive stars are born in multiple systems. At the same time, the most massive binaries are hard to find due to their low numbers through…
CAFÉ-BEANS: An exhaustive hunt for high-mass binaries
I. Negueruela, J. Maíz Apellániz, S. Simón-Díaz +11
CAFÉ-BEANS is an on-going survey running on the 2.2 m telescope at Calar Alto. For more than two years, CAFÉ-BEANS has been collecting high-resolution spectra of early-type stars w…
Orbital and physical properties of the Ori Aa,Ab,B triple system
Simón-Díaz, J. A. Caballero, J. Lorenzo +11
We provide a complete characterization of the astrophysical properties of the Ori Aa,Ab,B hierarchical triple system, and an improved set of orbital parameters for the highly e…
MY Camelopardalis, a very massive merger progenitor
J. Lorenzo, I. Negueruela, A. K. F. Val Baker +4
Context. The early-type binary MY Cam belongs to the young open cluster Alicante 1, embedded in Cam OB3. Aims. MY Cam consists of two early-O type main-sequence stars and shows a p…
Astrophysical parameters and orbital solution of the peculiar X-ray transient IGR J00370+6122
A. González-Galán, I. Negueruela, N. Castro +3
BD+6073 is the optical counterpart of the X-ray source IGR J00370+6122, a probable accretion-powered X-ray pulsar. The X-ray light curve of this binary system shows clear periodici…
Astrophysical parameters of the peculiar X-ray transient IGR J11215-5952
J. Lorenzo, I. Negueruela, N. Castro +3
The hard X-ray source IGR J11215-5952 is a peculiar transient, displaying very short X-ray outbursts every 165 days. We obtained high-resolution spectra of the optical counterpart,…
A third massive star component in the σ Orionis AB system
S. Simón-Díaz, J. A. Caballero, J. Lorenzo
We report on the detection of a third massive star component in the σ Orionis AB system, traditionally considered as a binary system. The system has been monitored by the IACOB spe…
Astrophysical parameters of LS2883 and implications for the PSR B1259-63 gamma-ray binary
Ignacio Negueruela, Marc Ribó, Artemio Herrero +3
Only a few binary systems with compact objects display TeV emission. The physical properties of the companion stars represent basic input to understand the physical mechanisms behi…