74 citations · 514 across the 13 of their papers we have counts for
13 papers
The IACOB project: XVI. Surface helium abundances in Galactic O-type stars: indications for identifying binary interaction products
S. Simón-Díaz, G. Holgado, C. Martínez-Sebastián +13
The presence of massive O-type stars with surfaces enriched by CNO-cycle products has been known since the early 1980s. For many years, internal rotational mixing was assumed to be…
X-Shooting ULLYSES: massive stars at low metallicity. I. Project Description
Jorick S. Vink, A. Mehner, P. A. Crowther +78
Observations of individual massive stars, super-luminous supernovae, gamma-ray bursts, and gravitational-wave events involving spectacular black-hole mergers, indicate that the low…
X-Shooting ULLYSES: Massive stars at low metallicity. III. Terminal wind speeds of ULLYSES massive stars
C. Hawcroft, H. Sana, L. Mahy +26
The winds of massive stars have an impact on stellar evolution and on the surrounding medium. The maximum speed reached by these outflows, the terminal wind speed, is a global wind…
A census of OBe stars in nearby metal-poor dwarf galaxies reveals a high fraction of extreme rotators
A. Schootemeijer, D. J. Lennon, M. Garcia +3
The Early Universe, together with many nearby dwarf galaxies, is deficient in heavy elements. The evolution of massive stars in such environments is thought to be affected by rotat…
Identifying two groups of massive stars aligned in the Galactic direction
Sebastián Ramírez Alegría, Artemio Herrero, Klaus Rübke +3
Context: Recent near-infrared data have contributed to unveil massive and obscured stellar populations in both new and previously known clusters in our Galaxy. These discoveries le…
The VLT-FLAMES Tarantula Survey XXVI: Properties of the O-dwarf population in 30 Doradus
C. Sabín-Sanjulián, S. Simón-Díaz, A. Herrero +21
The VLT-FLAMES Tarantula Survey has observed hundreds of O-type stars in the 30 Doradus region of the Large Magellanic Cloud (LMC). We study the properties of 105 apparently single…
OB stars at the lowest Local Group metallicity: GTC-OSIRIS observations of Sextans A
I. Camacho, M. Garcia, A. Herrero +1
Our aim is to find and classify OB stars in Sextans A, to later determine accurate stellar parameters of these blue massive stars in this low metallicity region $(Z \sim 0.1 \rm Z_…
Discovery of the massive overcontact binary VFTS 352: Evidence for enhanced internal mixing
L. A. Almeida, H. Sana, S. E. de Mink +15
The contact phase expected to precede the coalescence of two massive stars is poorly characterized due to the paucity of observational constraints. Here we report on the discovery…
The IACOB project: II. On the scatter of O-dwarf spectral type -- effective temperature calibrations
S. Simón-Díaz, A. Herrero, C. Sabín-Sanjulián +5
We are now in an era of large spectroscopic surveys of OB-type stars. Quantitative spectroscopic analysis of these modern datasets is enabling us to review the physical properties…
The VLT-FLAMES Tarantula Survey. XIII: On the nature of O Vz stars in 30 Doradus
C. Sabín-Sanjulián, S. Simón-Díaz, A. Herrero +13
AIMS. We test the hypothesis of O Vz stars (characterized by having HeII4686 stronger in absorption than other He lines in their blue-violet spectra) being at a younger evolutionar…
On the nature of WO stars: a quantitative analysis of the WO3 star DR1 in IC 1613
F. Tramper, G. Gräfener, O. E. Hartoog +8
Context. Oxygen sequence Wolf-Rayet (WO) stars are thought to represent the final evolutionary stage of the most massive stars. The characteristic strong O vi emission possibly ori…
The ARAUCARIA project: Grid-Based Quantitative Spectroscopic Study of Massive Blue Stars in NGC55
N. Castro, M. A. Urbaneja, A. Herrero +6
The quantitative study of the physical properties and chemical abundances of large samples of massive blue stars at different metallicities is a powerful tool to understand the nat…
The nature of V39: an LBV candidate or LBV impostor in the very low metallicity galaxy IC 1613?
A. Herrero, M. Garcia, K. Uytterhoeven +4
[abridged] Context: Very few examples of luminous blue variable (LBV) stars or LBV candidates (LBVc) are known, particularly at metallicities below the SMC. The LBV phase is crucia…