144 citations · 501 across the 26 of their papers we have counts for
20 papers · 1 filter
Closing gaps to our origins. The UV window into the Universe
Ana I. Gomez de Castro, Martin A. Barstow, Fréderic Baudin +23
The investigation of the emergence of life is a major endeavour of science. Astronomy is contributing to it in three fundamental manners: (1) by measuring the chemical enrichment o…
Intriguing X-ray and optical variations of the gamma Cas analog HD45314
G. Rauw, Y. Nazé, M. A. Smith +11
A growing number of Be and Oe stars, named the gamma Cas stars, are known for their unusually hard and intense X-ray emission. This emission could either trace accretion by a compa…
The Of?p stars of the Magellanic Clouds: Are they strongly magnetic?
Melissa Munoz, Gregg Wade, Yaël Nazé +2
All known Galactic Of?p stars have been shown to host strong, organized, magnetic fields. Recently, five Of?p stars have been discovered in the Magellanic Clouds. They posses photo…
B stars seen at high resolution by XMM-Newton
Constantin Cazorla, Yael Naze
We report on the properties of 11 early B stars observed with gratings on board XMM-Newton and Chandra, thereby doubling the number of B stars analysed at high resolution. The spec…
Chemical abundances of fast-rotating massive stars. II. Interpretation and comparison with evolutionary models
Constantin Cazorla, Yaël Nazé, Thierry Morel +3
Aims: Past observations of fast-rotating massive stars exhibiting normal nitrogen abundances at their surface have raised questions about the rotational mixing paradigm. We revisit…
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…
Investigating the Magnetospheres of Rapidly Rotating B-type Stars
C. L. Fletcher, V. Petit, Y. Naze +6
Recent spectropolarimetric surveys of bright, hot stars have found that ~10% of OB-type stars contain strong (mostly dipolar) surface magnetic fields (~kG). The prominent paradigm…
The puzzling properties of the magnetic O star Tr16-22
Yael Naze, Rodolfo Barba, Stefano Bagnulo +4
(abridged version) Context : The detection of bright, hard, and variable X-ray emission in Tr16-22 prompted spectropolarimetric observations of this star, which in turn led to the…
Spectroscopic variability of two Oe stars
G. Rauw, T. Morel, Y. Naze +28
The Oe stars HD45314 and HD60848 have recently been found to exhibit very different X-ray properties: whilst HD60848 has an X-ray spectrum and emission level typical of most OB sta…
V444 Cyg X-ray and polarimetric variability: Radiative and Coriolis forces shape the wind collision region
Jamie R. Lomax, Yael Naze, Jennifer L. Hoffman +8
We present results from a study of the eclipsing, colliding-wind binary V444 Cyg that uses a combination of X-ray and optical spectropolarimetric methods to describe the 3-D nature…
The modulated X-ray emission of the magnetic O8.5V-star Tr16-22
Yael Naze, Gregg Wade, Veronique Petit
Using an extensive X-ray dataset, we analyze the X-ray emission of the massive O-star Tr16-22, which was recently found to be magnetic. Its bright X-ray emission is found to be mod…
Investigation of the stellar content in the western part of the Carina nebula
Brajesh Kumar, Saurabh Sharma, Jean Manfroid +4
We obtained deep H photometric data of the field situated to the west of the main Carina nebula and centered on WR~22. Medium-resolution optical spectroscopy of a subsam…
Magnetic fields in O stars
Yael Naze
Over the last decade, large-scale, organized (generally dipolar) magnetic fields with a strength between 0.1 and 20 kG were detected in dozens of OB stars. This contribution review…
HD45314: a new gamma Cas analog among Oe stars
G. Rauw, Y. Naze, M. Spano +2
Oe stars possibly form an extension to higher temperatures of the Be phenomenon, but it is still unclear whether these stars have disks. X-ray spectra could provide hints for inter…
Discovery of X-ray emission from young suns in the Small Magellanic Cloud
L. M. Oskinova, W. Sun, C. J. Evans +11
We report the discovery of extended X-ray emission within the young star cluster NGC 602 in the Wing of the Small Magellanic Cloud (SMC) based on observations obtained with the Cha…
Magnetometry of a sample of massive stars in Carina
Y. Naze, S. Bagnulo, V. Petit +4
X-ray surveys of the Carina nebula have revealed a few hard and luminous sources associated with early-type stars. Such unusual characteristics for the high-energy emission may be…
The spectral variability and magnetic field characteristics of the Of?p star HD 148937
G. A. Wade, J. Grunhut, G. Graefener +11
We report magnetic and spectroscopic observations and modeling of the Of?p star HD 148937 within the context of the MiMeS LP at the CFHT. Thirty-two high signal-to-noise ratio circ…
Confirmation of the magnetic oblique rotator model for the Of?p star HD 191612
G. A. Wade, I. D. Howarth, R. H. D. Townsend +11
This paper reports high-precision Stokes V spectra of HD 191612 acquired using the ESPaDOnS spectropolarimeter at the Canada-France-Hawaii Telescope, in the context of the Magnetis…
Of?p stars: a class of slowly rotating magnetic massive stars
G. A. Wade, J. H. Grunhut, W. L. F. Marcolino +5
Only 5 Of?p stars have been identified in the Galaxy. Of these, 3 have been studied in detail, and within the past 5 years magnetic fields have been detected in each of them. The o…
Hot stars observed by XMM-Newton I. The catalog and the properties of OB stars
Yael Naze
Aims : Following the advent of increasingly sensitive X-ray observatories, deep observations of early-type stars became possible. However, the results for only a few objects or clu…