The Tarantula Massive Binary Monitoring: III. Atmosphere analysis of double-lined spectroscopic systems

Abstract

Accurate stellar parameters of individual objects in binary systems are essential to constrain the effects of binarity on stellar evolution. These parameters serve as a prerequisite to probing existing and future theoretical evolutionary models. We aim to derive the atmospheric parameters of the 31 SB2s in the TMBM sample. This sample, composed of detached, semi-detached and contact systems with at least one of the components classified as an O star, is an excellent test-bed to study how binarity can impact our knowledge of the evolution of massive stars. 32 epochs of FLAMES/GIRAFFE spectra are analysed using spectral disentangling to construct the individual spectra of 62 components. We apply the CMFGEN atmosphere code to determine their stellar parameters and their He, C and N surface abundances. From these properties, we show that the effects of tides on chemical mixing are limited. Components on longer-period orbits show higher nitrogen enrichment at their surface than those on shorter-period orbits, in contrast to expectations of rotational or tidal mixing, implying that other mechanisms play a role in this process. Components filling their Roche lobe are mass donors. They exhibit higher nitrogen content at their surface and rotate more slowly than their companions. By accreting new material, their companions spin faster and are rejuvenated. Their locations in the N-vsini diagram tend to show that binary products are good candidates to populate the two groups of stars (slowly rotating, nitrogen-enriched and rapidly rotating non-enriched) that cannot be reproduced through single-star population synthesis. This sample is the largest sample of binaries to be studied in such a homogeneous way. The study of these objects gives us strong observational constraints to test theoretical binary evolutionary tracks.

accepted to A&A Core of the paper 15 pages, Appendix: 41 pages

References in corpus (21)

• Binary interaction dominates the evolution of massive stars
• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• Southern Massive Stars at High Angular Resolution: Observational Campaign and Companion Detection
• UBVJHK synthetic photometry of Galactic O stars
• Rotational mixing in massive binaries: detached short-period systems
• Toward Complete Statistics of Massive Binary Stars: Penultimate Results from the Cygnus OB2 Radial Velocity Survey
• An excess of massive stars in the local 30 Doradus starburst
• The VLT-FLAMES survey of massive stars: constraints on stellar evolution from the chemical compositions of rapidly rotating Galactic and Magellanic Cloud B-type stars
• The VLT-FLAMES survey of massive stars: rotation and nitrogen enrichment as the key to understanding massive star evolution
• BONNSAI: a Bayesian tool for comparing stars with stellar evolution models
• The Tarantula Massive Binary Monitoring: I. Observational campaign and OB-type spectroscopic binaries
• The VLT-FLAMES Tarantula Survey XVII. Physical and wind properties of massive stars at the top of the main sequence
• The VLT-FLAMES Tarantula Survey XVI. The optical+NIR extinction laws in 30 Doradus and the photometric determination of the effective temperatures of OB stars
• The MiMeS Survey of Magnetism in Massive Stars: CNO surface abundances of Galactic O stars
• Early-type stars in the young open cluster IC1805. II. The probably single stars HD15570 and HD15629, and the massive binary/triple system HD15558
• The Tarantula Massive Binary Monitoring. IV. Double-lined photometric binaries
• A spectroscopic investigation of the O-type star population in four Cygnus OB associations. II. Determination of the fundamental parameters
• BONNSAI: correlated stellar observables in Bayesian methods
• Properties of six short-period massive binaries: a study of the effects of binarity on surface chemical abundances
• The Tarantula Massive Binary Monitoring project: II. A first SB2 orbital and spectroscopic analysis for the Wolf-Rayet binary R145
• A modern study of HD166734: a massive supergiant system

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• Detailed models of interacting short-period massive binary stars
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• The Tarantula Massive Binary Monitoring. IV. Double-lined photometric binaries
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• The Gaia-ESO Survey: The analysis of the hot-star spectra
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• Constraining the overcontact phase in massive binary evolution -- II. Period stability of known O+O overcontact systems
• The hydrogen clock to infer the upper stellar mass
• The Gaia-ESO survey: A spectroscopic study of the young open cluster NGC 3293
• BAT99 126: A multiple Wolf-Rayet system in the Large Magellanic Cloud with a massive near-contact binary
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