530 citations · 1.9k across the 19 of their papers we have counts for
19 papers
Enhancing the quality of gauge images captured in smoke and haze scenes through deep learning
Oscar H. Ramírez-Agudelo, Akshay N. Shewatkar, Edoardo Milana +2
Images captured in hazy and smoky environments suffer from reduced visibility, posing a challenge when monitoring infrastructures and hindering emergency services during critical s…
The Role of Noisy Data in Improving CNN Robustness for Image Classification
Oscar H. Ramírez-Agudelo, Nicoleta Gorea, Aliza Reif +2
Data quality plays a central role in the performance and robustness of convolutional neural networks (CNNs) for image classification. While high-quality data is often preferred for…
The B-type Binaries Characterisation Programme I. Orbital solutions for the 30 Doradus population
J. I. Villaseñor, W. D. Taylor, C. J. Evans +6
We present results from the B-type Binaries Characterisation (BBC) programme, a multi-epoch spectroscopic study of 88 early B-type binary candidates in the 30 Doradus region of the…
ELT Spectroscopy of Extragalactic Massive Stars
C. J. Evans, O. H. Ramirez-Agudelo, M. Garcia +2
Quantitative spectroscopy of O-type stars in galaxies beyond 1 Mpc requires the unprecedented sensitivity of the so-called Extremely Large Telescopes. Visible spectroscopy with the…
Response to comment on "An excess of massive stars in the local 30 Doradus starburst"
F. R. N. Schneider, H. Sana, C. J. Evans +29
Farr and Mandel reanalyse our data, finding initial-mass-function slopes for high mass stars in 30 Doradus that agree with our results. However, their reanalysis appears to underpr…
The VLT-FLAMES Tarantula Survey. XXIX. Massive star formation in the local 30 Doradus starburst
F. R. N. Schneider, O. H. Ramírez-Agudelo, F. Tramper +24
The 30 Doradus (30 Dor) nebula in the Large Magellanic Cloud (LMC) is the brightest HII region in the Local Group and a prototype starburst similar to those found in high redshift…
Simulating Surveys for ELT-MOSAIC: Status of the MOSAIC Science Case after Phase A
M. Puech, C. J. Evans, K. Disseau +17
We present the consolidated scientific case for multi-object spectroscopy with the MOSAIC concept on the European ELT. The cases span the full range of ELT science and require eith…
The VLT-FLAMES Tarantula Survey: XXVIII. Nitrogen abundances for apparently single dwarf and giant B-type stars with small projected rotational velocities
P. L. Dufton, A. Thompson, P. A. Crowther +13
Previous analyses of the spectra of OB-type stars in the Magellanic Clouds have identified targets with low projected rotational velocities and relatively high nitrogen abundances.…
An excess of massive stars in the local 30 Doradus starburst
F. R. N. Schneider, H. Sana, C. J. Evans +29
The 30 Doradus star-forming region in the Large Magellanic Cloud is a nearby analogue of large star-formation events in the distant Universe. We determine the recent formation hist…
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…
The Tarantula Massive Binary Monitoring: I. Observational campaign and OB-type spectroscopic binaries
L. A. Almeida, H. Sana, W. Taylor +24
Massive binaries (MBs) play a crucial role in the Universe. Knowing the distributions of their orbital parameters (OPs) is important for a wide range of topics, from stellar feedba…
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 VLT-FLAMES Tarantula Survey XXI. Stellar spin rates of O-type spectroscopic binaries
O. H. Ramírez-Agudelo, H. Sana, S. E. de Mink +9
The initial distribution of spin rates of massive stars is a fingerprint of their elusive formation process. It also sets a key initial condition for stellar evolution and is thus…
The properties of ten O-type stars in the low-metallicity galaxies IC 1613, WLM and NGC 3109
F. Tramper, H. Sana, A. de Koter +2
Massive stars likely played an important role in the reionization of the Universe, and the formation of the first black holes. Massive stars in low-metallicity environments in the…
Rotational velocities of single and binary O-type stars in the Tarantula Nebula
O. H. Ramírez-Agudelo, H. Sana, A. de Koter +15
Rotation is a key parameter in the evolution of massive stars, affecting their evolution, chemical yields, ionizing photon budget, and final fate. We determined the projected rotat…
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…
The VLT-FLAMES Tarantula Survey XII. Rotational velocities of the single O-type stars
O. H. Ramírez-Agudelo, S. Simón-Díaz, H. Sana +15
Aims. Using ground based multi-object optical spectroscopy obtained in the framework of the VLT-FLAMES Tarantula Survey (VFTS), we aim to establish the (projected) rotational veloc…
The VLT-FLAMES Tarantula Survey X: Evidence for a bimodal distribution of rotational velocities for the single early B-type stars
P. L. Dufton, N. Langer, P. R. Dunstall +12
Aims: Projected rotational velocities (\vsini) have been estimated for 334 targets in the VLT-FLAMES Tarantula survey that do not manifest significant radial velocity variations an…
The VLT-FLAMES Tarantula Survey VIII. Multiplicity properties of the O-type star population
H. Sana, A. de Koter, S. E. de Mink +14
Aims. We analyze the multiplicity properties of the massive O-type star population. With 360 O-type stars, this is the largest homogeneous sample of massive stars analyzed to date.…