Publications (14)
Surface abundances of ON stars
F. Martins, S. Simon-Diaz, A. Palacios +5
Massive stars burn hydrogen through the CNO cycle during most of their evolution. When mixing is efficient, or when mass transfer in binary systems happens, chemically processed ma…
Surface abundances of OC supergiants
F. Martins, S. Foschino, J. -C. Bouret +2
Some O and B stars show unusually strong or weak lines of carbon and/or nitrogen. These objects are classified as OBN or OBC stars. It has recently been shown that nitrogen enrichm…
The first orbital solution for the massive colliding-wind binary HD93162 (=WR25)
R. Gamen, E. Gosset, N. Morrell +6
Since the discovery, with the EINSTEIN satellite, of strong X-ray emission associated with HD93162 (=WR25), this object has been predicted to be a colliding-wind binary system. How…
Optical Spectroscopy of X-Mega targets in the Carina Nebula - VI. FO 15: a new O-Type double-lined eclipsing binary
V. S. Niemela, N. I. Morrell, E. Fernandez Lajus +3
We report the discovery of a new O-type double-lined spectroscopic binary with a short orbital period of 1.4 days. We find the primary component of this binary, FO 15, to have an a…
The Tarantula Massive Binary Monitoring project: II. A first SB2 orbital and spectroscopic analysis for the Wolf-Rayet binary R145
T. Shenar, N. D. Richardson, D. P. Sablowski +19
We present the first SB2 orbital solution and disentanglement of the massive Wolf-Rayet binary R145 (P = 159d) located in the Large Magellanic Cloud. The primary was claimed to hav…
GRAVITY spectro-interferometric study of the massive multiple stellar system HD 93 206 A
J. Sanchez-Bermudez, A. Alberdi, R. Barba +9
Characterization of the dynamics of massive star systems and the astrophysical properties of the interacting components are a prerequisite for understanding their formation and evo…
Spectroscopic monitoring of Southern Galactic O and WN stars: State of the Art in 2007
R. Gamen, R. Barba, N. Morrell +5
We are conducting a spectroscopic monitoring of O and WN -type stars in our Galaxy. In this work, we summarize some of our first results related to the search for radial-velocity v…
A remarkable change of the spectrum of the magnetic Of?p star HD 148937 reveals evidence of an eccentric, high-mass binary
G. A. Wade, J. V. Smoker, C. J. Evans +10
We report new spectroscopic observations of the magnetic Of?p star HD 148937 obtained since 2015 that differ qualitatively from its extensive historical record of weak, periodic sp…
First constraints on the magnetic field strength in extra-Galactic stars: FORS2 observations of Of?p stars in the Magellanic Clouds
S. Bagnulo, Y. Naze, I. D. Howarth +6
Massive O-type stars play a dominant role in our Universe, but many of their properties remain poorly constrained. In the last decade magnetic fields have been detected in all Gala…
B fields in OB stars (BOB): The magnetic triple stellar system HD 164492C in the Trifid nebula
J. F. Gonzalez, S. Hubrig, N. Przybilla +15
HD 164492C is a spectroscopic triple stellar system that has been recently detected to possess a strong magnetic field. We have obtained high-resolution spectroscopic and spectropo…
Milky Way Demographics with the VVV Survey II. Color Transformations and Near-Infrared Photometry for 136 Million Stars in the Southern Galactic Disk
M. Soto, R. Barba, G. Gunthardt +18
The new multi-epoch near-infrared VVV survey (VISTA Variables in the Via Lactea) is sampling 562 sq. deg of the Galactic bulge and adjacent regions of the disk. Accurate astrometry…
The B Fields in OB Stars (BOB) Survey
T. Morel, N. Castro, L. Fossati +29
The B fields in OB stars (BOB) survey is an ESO large programme collecting spectropolarimetric observations for a large number of early-type stars in order to study the occurrence…
ISOCAM Mid-infrared spectroscopy and NIR photometry of the HII complex N4 in LMC
A. Contursi, M. Rubio, M. Sauvage +3
[Abridged] We present the analysis of ISOCAM-CVF and NIR photometry data of the HII region complex N4 in LMC. The aim is twofold: 1) to study the connection between the ISM and the…
The infrared Hourglass cluster in M8
J. Arias, R. Barba, J. Maiz Apellaniz +2
A detailed study of the Hourglass Nebula in the M8 star forming region is presented. The study is mainly based on recent subarcsec-resolution JHKs images taken at Las Campanas Obse…