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24 April 2024 |
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Stellar modelling of Spica, a high-mass spectroscopic binary with a beta Cep variable primary component | | A. Tkachenko
; J. M. Matthews
; C. Aerts
; K. Pavlovski
; P. I. Papics
; K. Zwintz
; C. Cameron
; G. A. H. Walker
; R. Kuschnig
; P. Degroote
; J. Debosscher
; E. Moravveji
; V. Kolbas
; D. B. Guenther
; A. F. J. Moffat
; J. F. Rowe
; S. M. Rucinski
; D. Sasselov
; W. W. Weiss
; | | Date: |
29 Jan 2016 | | Abstract: | Binary stars provide a valuable test of stellar structure and evolution,
because the masses of the individual stellar components can be derived with
high accuracy and in a model-independent way. In this work, we study Spica, an
eccentric double-lined spectroscopic binary system with a beta Cep type
variable primary component. We use state-of-the-art modelling tools to
determine accurate orbital elements of the binary system and atmospheric
parameters of both stellar components. We interpret the short-period
variability intrinsic to the primary component, detected on top of the orbital
motion both in the photometric and spectroscopic data. The non-LTE based
spectrum analysis reveals two stars of similar atmospheric chemical composition
consistent with the present day cosmic abundance standard defined by
Nieva&Przybilla (2012). The masses and radii of the stars are found to be
11.43+/-1.15 M_sun and 7.21+/-0.75 M_sun, and 7.47+/-0.54 R_sun and 3.74+/-0.53
R_sun for the primary and secondary, respectively. We find the primary
component to pulsate in three independent modes, of which one is identified as
a radial mode, while the two others are found to be non-radial, low degree l
modes. The frequency of one of these modes is an exact multiple of the orbital
frequency, and the l=m=2 mode identification suggests a tidal nature for this
particular mode. We find a very good agreement between the derived dynamical
and evolutionary masses for the Spica system to within the observational errors
of the measured masses. The age of the system is estimated to be 12.5+/-1 Myr. | | Source: | arXiv, 1601.8069 | | Services: | Forum | Review | PDF | Favorites | |
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