Binarity at LOw Metallicity (BLOeM): Multiplicity of early B-type supergiants in the Small Magellanic Cloud

Abstract

The blue supergiant (BSG) domain contains a large variety of stars whose past and future evolutionary paths are still highly uncertain. Since binary interaction plays a crucial role in the fate of massive stars, investigating the multiplicity among BSGs helps shed light on the fate of such objects. We aim to estimate the binary fraction of a large sample of BSGs in the Small Magellanic Cloud within the Binarity at LOw Metallicity (BLOeM) survey. In total, we selected 262 targets with spectral types B0-B3 and luminosity classes I-II. This work is based on spectroscopic data collected by the GIRAFFE instrument, mounted on the Very Large Telescope, which gathered nine epochs over three months. Our spectroscopic analysis for each target includes the individual and peak-to-peak radial velocity measurements, an investigation of the line profile variability, and a periodogram analysis to search for possible short- and long-period binaries. By applying a 20 km s${}^{-1}$ threshold on the peak-to-peak radial velocities above which we would consider the star to be binary, the resulting observed spectroscopic binary fraction for our BSG sample is 23 $\pm$ 3$\%$. In addition, we derived reliable orbital periods for 41 spectroscopic binaries and potential binary candidates, among which there are 17 eclipsing binaries, including 20 SB1 and SB2 systems with periods of less than 10 days. We reported a significant drop in the binary fraction of BSGs with spectral types later than B2 and effective temperatures less than 18 kK, which could indicate the end of the main sequence phase in this temperature regime. We found no metallicity dependence in the binary fraction of BSGs, compared to existing spectroscopic surveys of the Galaxy and Large Magellanic Cloud.

18 pages, 14 figures, accepted for publication in Astronomy & Astrophysics

References in corpus (31)

• Gaia Data Release 3: Summary of the content and survey properties
• Binary interaction dominates the evolution of massive stars
• A Grid of NLTE Line-Blanketed Model Atmospheres of Early B-type Stars
• BONNSAI: a Bayesian tool for comparing stars with stellar evolution models
• Cross-Correlation and Maximum Likelihood Analysis: A New Approach to Combine Cross-Correlation Functions
• Low-frequency gravity waves in blue supergiants revealed by high-precision space photometry
• Luminous Blue Variables and superluminous supernovae from binary mergers
• Towards a unified view of inhomogeneous stellar winds in isolated supergiant stars and supergiant high mass X-ray binaries
• Constraining mixing in massive stars in the Small Magellanic Cloud
• Variability of OB stars from TESS southern Sectors 1-13 and high-resolution IACOB and OWN spectroscopy
• Massive donors in interacting binaries: effect of metallicity
• Detailed models of interacting short-period massive binary stars
• 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
• A census of massive stars in NGC 346. Stellar parameters and rotational velocities
• Pre-supernova evolution and final fate of stellar mergers and accretors of binary mass transfer
• On the Blue Loops of Intermediate-Mass Stars
• Rejuvenated accretors have less bound envelopes: Impact of Roche lobe overflow on subsequent common envelope events
• The B-type Binaries Characterisation Programme I. Orbital solutions for the 30 Doradus population
• Multiplicity of Galactic Luminous Blue Variable stars
• Blue supergiant progenitor models of Type II supernovae
• Numerical experiments to help understand cause and effect in massive star evolution
• Binarity at LOw Metallicity (BLOeM): a spectroscopic VLT monitoring survey of massive stars in the SMC
• A dearth of young and bright massive stars in the Small Magellanic Cloud
• The IACOB project XII. A new grid of northern standards for the spectral classification of B-type stars
• The IACOB project X. Large-scale quantitative spectroscopic analysis of Galactic luminous blue stars
• Quantitative spectroscopy of B-type supergiants
• The Asteroseismic Imprints of Mass Transfer: A Case Study of a Binary Mass Gainer in the SPB Instability Strip
• Binarity at Low Metallicity (BLOeM) -- Multiplicity properties of Oe and Be stars
• Binarity at LOw Metallicity (BLOeM): The multiplicity properties and evolution of BAF-type supergiants
• Tracing back the evolution of the candidate LBV HD168625
• The IACOB project XIV. New clues on the location of the TAMS in the massive star domain

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