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The B-type binaries characterisation programme I. Orbital solutions for the 30 Doradus population

Villaseñor, Jaime and Taylor, William and Evans, Chris and Ramirez Agudelo, Oscar Hernan and Sana, Hugues and Almeida, Leonardo and de Mink, Selma and Dufton, Philip and Langer, Norbert (2021) The B-type binaries characterisation programme I. Orbital solutions for the 30 Doradus population. Monthly Notices of the Royal Astronomical Society. Oxford University Press. doi: 10.1093/mnras/stab2197. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stab2197/6333371

Abstract

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 Large Magellanic Cloud (LMC). From radial-velocity analysis of 29 observational epochs we confirm the binary status of 64 of our targets, comprising 50 SB1 and 14 SB2 B-type binaries. A further 20 systems (classified as SB1*) show clear signs of periodicity but with more tentative periods. Orbital solutions are presented for these 84 systems, providing the largest homogeneous sample to date of the binary properties of early B-type stars. Our derived orbital-period distribution is generally similar to those for samples of more massive (O-type) binaries in both the LMC and the Galaxy. This similarity with the properties of the more massive O-type binaries is important as early B-type stars are expected to account for the majority of core-collapse supernovae. Differences in the period distributions of the different samples start to increase above 4 d, and are also present between the earliest (B0-0.7) and later-type (B1-2.5) systems within the BBC sample, although further study is required to understand if this is an observational bias or a real physical effect. We have examined the semi-amplitude velocities and orbital periods of our sample to identify potential candidates that could hide compact companions. Comparing with probability distributions of finding black hole companions to OB-type stars from a recent theoretical study, we have found 16 binaries in the higher probability region that warrant further study.

Item URL in elib:https://elib.dlr.de/143872/
Document Type:Article
Title:The B-type binaries characterisation programme I. Orbital solutions for the 30 Doradus population
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Villaseñor, JaimeInstitute of Astronnomy, University of Edinburgh, UKUNSPECIFIED
Taylor, WilliamUK Astronomy Technology Centre, UKUNSPECIFIED
Evans, ChrisUK Astronomy Technology Centre, UKUNSPECIFIED
Ramirez Agudelo, Oscar HernanOscar.RamirezAgudelo (at) dlr.dehttps://orcid.org/0000-0002-9379-5409
Sana, HuguesInstitute voor Sterrenkunde, KU Leuven, BelgiumUNSPECIFIED
Almeida, LeonardoUniversidade do Estado do Rio Grande do Norte, BrazilUNSPECIFIED
de Mink, SelmaMax-Planck-Institut für Astrophysik, München, GEUNSPECIFIED
Dufton, PhilipAstrophysics Research Centre, School of Mathematics and Physics, UKUNSPECIFIED
Langer, NorbertArgelander-Institut für Astronomie, Universität Bonn, GermanyUNSPECIFIED
Date:31 July 2021
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1093/mnras/stab2197
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:binaries: spectroscopic, stars: early-type, stars: massive, galaxies: Magellanic Clouds, open clusters and associations: individual: 30 Doradus
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Planetary Evolution and Life
Location: Rhein-Sieg-Kreis
Institutes and Institutions:Institute for the Protection of Terrestrial Infrastructures
Deposited By: Ramirez Agudelo, Oscar Hernan
Deposited On:13 Sep 2021 13:34
Last Modified:13 Sep 2021 13:51

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