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Two new SB2 binaries with main sequence B-type pulsators in the Kepler field | | P. I. Pápics
; A. Tkachenko
; C. Aerts
; M. Briquet
; P. Marcos-Arenal
; P. G. Beck
; K. Uytterhoeven
; A. Triviño Hage
; J. Southworth
; K. I. Clubb
; S. Bloemen
; P. Degroote
; J. Jackiewicz
; J. McKeever
; H. Van Winckel
; E. Niemczura
; J. F. Gameiro
; J. Debosscher
; | | Date: |
8 Apr 2013 | | Abstract: | Context: OB stars are important in the chemistry and evolution of the
Universe, but the sample of targets well understood from an asteroseismological
point of view is still too limited to provide feedback on the current
evolutionary models. Our study extends this sample with two spectroscopic
binary systems. AIMS. Our goal is to provide orbital solutions, fundamental
parameters and abundances from disentangled high-resolution high
signal-to-noise spectra, as well as to analyse and interpret the variations in
the Kepler light curve of these carefully selected targets. This way we
continue our efforts to map the instability strips of beta Cep and SPB stars
using the combination of high-resolution ground-based spectroscopy and
uninterrupted space-based photometry. Methods: We fit Keplerian orbits to
radial velocities measured from selected absorption lines of high-resolution
spectroscopy using synthetic composite spectra to obtain orbital solutions. We
use revised masks to obtain optimal light curves from the original pixel-data
from the Kepler satellite, which provided better long term stability compared
to the pipeline processed light curves. We use various time-series analysis
tools to explore and describe the nature of variations present in the light
curve. Results: We find two eccentric double-lined spectroscopic binary systems
containing a total of three main sequence B-type stars (and one F-type
component) of which at least one in each system exhibits light variations. The
light curve analysis (combined with spectroscopy) of the system of two B stars
points towards the presence of tidally excited g modes in the primary
component. We interpret the variations seen in the second system as classical g
mode pulsations driven by the kappa mechanism in the B type primary, and
explain the unexpected power in the p mode region as a result of nonlinear
resonant mode excitation. | | Source: | arXiv, 1304.2202 | | Services: | Forum | Review | PDF | Favorites | |
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