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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.…
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…
The VLT-FLAMES Tarantula Survey XXV. Surface nitrogen abundances of O-type giants and supergiants
N. J. Grin, O. H. Ramirez-Agudelo, A. de Koter +19
Theoretically, rotation-induced chemical mixing in massive stars has far reaching evolutionary consequences, affecting the sequence of morphological phases, lifetimes, nucleosynthe…
Broad Balmer Wings in BA Hyper/Supergiants Distorted by Diffuse Interstellar Bands: Five Examples in the 30 Doradus Region from the VLT-FLAMES Tarantula Survey
Nolan R. Walborn, Hugues Sana, Christopher J. Evans +11
Extremely broad emission wings at H and H have been found in VFTS data for five very luminous BA supergiants in or near 30 Doradus in the Large Magellanic Cloud. The profiles…
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 VLT-FLAMES Tarantula Survey XVIII. Classifications and radial velocities of the B-type stars
C. J. Evans, M. B. Kennedy, P. L. Dufton +14
We present spectral classifications for 438 B-type stars observed as part of the VLT-FLAMES Tarantula Survey (VFTS) in the 30 Doradus region of the Large Magellanic Cloud. Radial v…
The VLT-FLAMES Tarantula Survey XIX. B-type Supergiants - Atmospheric parameters and nitrogen abundances to investigate the role of binarity and the width of the main sequence
C. M. McEvoy, P. L. Dufton, C. J. Evans +19
TLUSTY non-LTE model atmosphere calculations have been used to determine atmospheric parameters and nitrogen (N) abundances for 34 single and 18 binary B-type supergiants (BSGs). T…
The VLT-FLAMES Tarantula Survey XIV. The O-Type Stellar Content of 30 Doradus
N. R. Walborn, H. Sana, S. Simon-Diaz +6
Detailed spectral classifications are presented for 352 O-B0 stars in the VLT-FLAMES Tarantula Survey, of which 213 O-type are of sufficient quality for further morphological analy…
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 - XI. A census of the hot luminous stars and their feedback in 30 Doradus
E. I. Doran, P. A. Crowther, A. de Koter +16
We compile the first comprehensive census of hot luminous stars in the 30 Doradus (30 Dor) star forming region of the LMC. The census extends to a radius of 10arcmin (150pc) from t…
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.…
The VLT-FLAMES Tarantula Survey IV: Candidates for isolated high-mass star formation in 30 Doradus
E. Bressert, N. Bastian, C. J. Evans +15
Whether massive stars can occasionally form in relative isolation or if they require a large cluster of lower-mass stars around them is a key test in the differentiation of star fo…