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Title: The eccentric massive binary V380 Cyg: revised orbital elements and interpretation of the intrinsic variability of the primary component
Authors: Tkachenko, Andrew ×
Degroote, Pieter
Aerts, Conny
Pavlovski, K
Southworth, J
Pápics, Péter
Moravveji, Ehsan
Kolbas, V
Tsymbal, V
Debosscher, Jonas
Clémer, Katrijn #
Issue Date: Mar-2014
Publisher: Priestley and Weale
Series Title: Monthly Notices of the Royal Astronomical Society vol:438 issue:4 pages:3093-3110
Abstract: We present a detailed analysis and interpretation of the high-mass binary V380 Cyg, based on high-precision space photometry gathered with the Kepler space mission as well as high-resolution ground-based spectroscopy obtained with the HERMES spectrograph attached to the 1.2 m Mercator telescope. We derive a precise orbital solution and the full physical properties of the system, including dynamical component mass estimates of 11.43 ± 0.19 and 7.00 ± 0.14 M⊙ for the primary and secondary, respectively. Our frequency analysis reveals the rotation frequency of the primary in both the photometric and spectroscopic data and additional low-amplitude stochastic variability at low frequency in the space photometry with characteristics that are compatible with recent theoretical predictions for gravity-mode oscillations excited either by the convective core or by sub-surface convective layers. Doppler imaging analysis of the silicon lines of the primary suggests the presence of two high-contrast stellar surface abundance spots which are located either at the same latitude or longitude. Comparison of the observed properties of the binary with present-day single-star evolutionary models shows that the latter are inadequate and lack a serious amount of near-core mixing.
ISSN: 0035-8711
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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