The Library
Apsidal motion in massive eccentric binaries in NGC 6231
Tools
Rosu, S., Rauw, G., Farnir, M., Dupret, M.-A. and Noels, A. (2022) Apsidal motion in massive eccentric binaries in NGC 6231. Astronomy & Astrophysics, 660 . A120. doi:10.1051/0004-6361/202141304 ISSN 0004-6361.
|
PDF
WRAP-Apsidal-motion-in-massive-eccentric-binaries-in-NGC-6231-Farnir-22.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (5Mb) | Preview |
Official URL: http://dx.doi.org/10.1051/0004-6361/202141304
Abstract
Context. The measurement of the apsidal motion in close eccentric massive binary systems provides essential information to probe the internal structure of the stars that compose the system.
Aims. Following the determination of the fundamental stellar and binary parameters, we make use of the tidally induced apsidal motion to infer constraints on the internal structure of the stars composing the binary system HD 152219.
Methods. The extensive set of spectroscopic, photometric, and radial velocity observations allowed us to constrain the fundamental parameters of the stars together with the rate of apsidal motion of the system. Stellar structure and evolution models were further built with the Clés code testing different prescriptions for the internal mixing occurring inside the stars. The effect of stellar rotation axis misalignment with respect to the normal to the orbital plane on our interpretation of the apsidal motion in terms of internal structure constants is investigated.
Results. Made of an O9.5 III primary star (M1 = 18.64 ± 0.47 M⊙, R1 = 9.40−0.15+0.14 R⊙, Teff,1 = 30 900 ± 1000 K, Lbol,1 = (7.26 ± 0.97)×104 L⊙) and a B1-2 V-III secondary star (M2 = 7.70 ± 0.12 M⊙, R2 = 3.69 ± 0.06 R⊙, Teff,2 = 21 697 ± 1000 K, Lbol,2 = (2.73 ± 0.51)×103 L⊙), the binary system HD 152219 displays apsidal motion at a rate of (1.198 ± 0.300)° yr−1. The weighted-average mean of the internal structure constant of the binary system is inferred: k̄2 = 0.00173 ± 0.00052. For the Clés models to reproduce the k2-value of the primary star, a significantly enhanced mixing is required, notably through the turbulent mixing, but at the cost that other stellar parameters cannot be reproduced simultaneously.
Conclusions. The difficulty to reproduce the k2-value simultaneously with the stellar parameters as well as the incompatibility between the age estimates of the primary and secondary stars are indications that some physics of the stellar interior are still not completely understood.
Item Type: | Journal Article | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Subjects: | Q Science > QB Astronomy | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
Library of Congress Subject Headings (LCSH): | Stars, Stars -- Formation, Astrophysics, Double stars, Eclipsing binaries | |||||||||
Journal or Publication Title: | Astronomy & Astrophysics | |||||||||
Publisher: | EDP Sciences | |||||||||
ISSN: | 0004-6361 | |||||||||
Official Date: | 22 April 2022 | |||||||||
Dates: |
|
|||||||||
Volume: | 660 | |||||||||
Number of Pages: | 29 | |||||||||
Article Number: | A120 | |||||||||
DOI: | 10.1051/0004-6361/202141304 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Copyright Holders: | ESO | |||||||||
Date of first compliant deposit: | 24 May 2022 | |||||||||
Date of first compliant Open Access: | 25 May 2022 | |||||||||
RIOXX Funder/Project Grant: |
|
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |
Downloads
Downloads per month over past year