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The VLT-FLAMES Tarantula Survey: Observational evidence for two distinct populations of massive runaway stars in 30 Doradus

Sana, Hugues and Ramirez Agudelo, Oscar Hernan and Henault-Brunet, Vincent and Mahy, Laurent and Almeida, Leonardo and de Koter, Alex and Bestenlehner, Joachim and Evans, Chris and Langer, Norbert and Schneider, Fabian and Crowther, Paul and de Mink, Selma and Herrero, Artemio and Lennon, Danny and Gieles, Mark and Maiz Apellaniz, Jesus and Renzo, Mathieu and Sabbi, Elena and van Loon, Jacco and Vink, Jorick (2022) The VLT-FLAMES Tarantula Survey: Observational evidence for two distinct populations of massive runaway stars in 30 Doradus. Astronomy & Astrophysics, 668 (L5). EDP Sciences. doi: 10.1051/0004-6361/202244677. ISSN 0004-6361.

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Official URL: https://www.aanda.org/articles/aa/pdf/2022/12/aa44677-22.pdf


Context. The origin of massive runaway stars is an important unsolved problem in astrophysics. Two main scenarios have been proposed, namely: dynamical ejection or release from a binary at the first core collapse. However, their relative contribution remains heavily debated. Aims. Taking advantage of two large spectroscopic campaigns towards massive stars in 30 Doradus, we aim to provide observational constraints on the properties of the O-type runaway population in the most massive active star-forming region in the Local Group. Methods. We used radial velocity measurements of the O-type star populations in 30 Doradus obtained by the VLT-FLAMES Tarantula Survey and the Tarantula Massive Binary Monitoring to identify single and binary O-type runaways. Here, we discuss the rotational properties of the detected runaways and qualitatively compare the observations with expectations of ejection scenarios. Results. We identified 23 single and one binary O-type runaway objects, most of them located outside the main star-forming regions in 30 Doradus. We find an overabundance of rapid rotators (ve sin i > 200 km s−1) among the runaway population, thus providing an explanation for the observed overabundance of rapidly rotating stars in the 30 Doradus field. Considerations of the projected rotation rates and runaway line-of-sight velocities reveal a conspicuous absence of rapidly rotating (ve sin i > 210 km s−1), fast-moving (vlos > 60 km s−1) runaway stars in our sample, strongly suggesting the presence of two different populations of runaway stars: a population of rapidly spinning but slowly moving runaway stars and a population of fast-moving but slowly rotating ones. These are detected with a ratio close to 2:1 in our sample. Conclusions. We argue that slowly moving but rapidly spinning runaway stars result from binary ejections, while rapidly moving but slowly spinning runaways could result from dynamical ejections. Given that detection biases will more strongly impact the slow-moving runaway population, our results suggest that the binary evolution scenario dominates the current massive runaway star population in 30 Doradus.

Item URL in elib:https://elib.dlr.de/191141/
Document Type:Article
Title:The VLT-FLAMES Tarantula Survey: Observational evidence for two distinct populations of massive runaway stars in 30 Doradus
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Sana, HuguesInstitute voor Sterrenkunde, KU LeuvenUNSPECIFIEDUNSPECIFIED
Ramirez Agudelo, Oscar HernanUNSPECIFIEDhttps://orcid.org/0000-0002-9379-5409UNSPECIFIED
Henault-Brunet, VincentSaint Mary’s University, Halifax, NS, CanadaUNSPECIFIEDUNSPECIFIED
Almeida, LeonardoUniversidade do Estado do Rio Grande do Norte, BrazilUNSPECIFIEDUNSPECIFIED
de Koter, AlexAstronomical Institute Anton PannekoekUNSPECIFIEDUNSPECIFIED
Bestenlehner, JoachimUniversity of Sheffield, UKUNSPECIFIEDUNSPECIFIED
Evans, ChrisUK Astronomy Technology Centre, UKUNSPECIFIEDUNSPECIFIED
Langer, NorbertArgelander-Institut für Astronomie, Universität Bonn, GermanyUNSPECIFIEDUNSPECIFIED
Schneider, FabianCentre for Astronomy, University of Heidelberg, GermanyUNSPECIFIEDUNSPECIFIED
Crowther, PaulUniversity of Sheffield, UKUNSPECIFIEDUNSPECIFIED
de Mink, SelmaMax-Planck-Institut für Astrophysik, München, GEUNSPECIFIEDUNSPECIFIED
Herrero, ArtemioInstituto de Astrofisica de Canarias, SpainUNSPECIFIEDUNSPECIFIED
Lennon, DannyInstituto de Astrofisica de CanariasUNSPECIFIEDUNSPECIFIED
Gieles, MarkICCUB-IEEC, Universitat de Barcelona, SpainUNSPECIFIEDUNSPECIFIED
Renzo, MathieuCCA, Flatiron Institute, New York, USAUNSPECIFIEDUNSPECIFIED
Sabbi, ElenaSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAUNSPECIFIEDUNSPECIFIED
van Loon, JaccoKeele University, UKUNSPECIFIEDUNSPECIFIED
Vink, JorickArmagh Observatory and PlanetariumUNSPECIFIEDUNSPECIFIED
Date:December 2022
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:EDP Sciences
Series Name:Astronomy & Astrophysics Letter
Keywords:stars: early-type / stars: massive / binaries: spectroscopic / stars: rotation / stars: kinematics and dynamics / galaxies: star clusters: individual: 30 Dor
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Rhein-Sieg-Kreis
Institutes and Institutions:Institute for the Protection of Terrestrial Infrastructures
Institute for the Protection of Terrestrial Infrastructures > Detection Systems
Deposited By: Ramirez Agudelo, Oscar Hernan
Deposited On:18 Jan 2023 09:06
Last Modified:05 Sep 2023 12:43

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