J/A+A/608/A103 43 Cyg decorrelated 156-day light curve (Zwintz+, 2017)
Constraining the near-core rotation of the gamma Doradus star 43 Cygni using
BRITE-Constellation data.
Zwintz K., Van Reeth T., Tkachenko A., Goessl S., Pigulski A., Kuschnig R.,
Handler G., Moffat A.F.J., Popowicz A., Wade G., Weiss W.W.
<Astron. Astrophys. 608, A103 (2017)>
=2017A&A...608A.103Z 2017A&A...608A.103Z (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, CCD ; Space observations ; Stars, variable
Keywords: asteroseismology - stars: individual: 43 Cygni - stars: interiors -
stars: oscillations - stars: fundamental parameters
Abstract:
Photometric time series of the gamma Doradus star 43 Cyg obtained with
the BRITE-Constellation nano-satellites allow us to study its
pulsational properties in detail and to constrain its interior
structure.
We aim to find a g-mode period spacing pattern that allows us to
determine the near-core rotation rate of 43 Cyg and redetermine the
star's fundamental atmospheric parameters and chemical composition.
We conducted a frequency analysis using the 156-days long data set
obtained with the BRITE-Toronto satellite and employed a suite of
MESA/GYRE models to derive the mode identification, asymptotic period
spacing and near-core rotation rate. We also used high-resolution,
high signal-to-noise ratio spectroscopic data obtained at the 1.2m
Mercator telescope with the HERMES spectrograph to redetermine the
fundamental atmospheric parameters and chemical composition of 43 Cyg
using the software Spectroscopy Made Easy (SME).
We detected 43 intrinsic pulsation frequencies and identified 18 of
them to be part of a period spacing pattern consisting of prograde
dipole modes with an asymptotic period spacing of 2970(+700,-570)s.
The near-core rotation rate was determined to be 0.56(+0.12,-0.14)c/d.
The atmosphere of 43 Cyg shows solar chemical composition at an
effective temperature of 7150±150K, a logg of 4.2±0.6dex and a
projected rotational velocity, vsini, of 44±4km/s.
The morphology of the observed period spacing patterns shows
indications of the presence of a significant chemical gradient in the
stellar interior.
Description:
Decorrelated 156-day light curve for 43 Cygni obtained with the
BRITE-Constellation satellite BRITE Heweliusz in the red filter. The
first column lists the time as HJD-24560000.0 in days, the second
column is the reduced and decorrelated flux in millimagnitudes.
Objects:
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RA (2000) DE Designation(s)
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20 27 02.27 +49 23 00.1 43 Cyg = V* V2121 Cyg
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
43cyg.dat 20 98481 43 Cyg decorrelated 156-day light curve
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Byte-by-byte Description of file: 43cyg.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d Time Heliocentric Julian date (HJD-2456000.0)
12- 20 F9.3 mmag Flux Decorrelated flux (in millimagnitudes)
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Acknowledgements:
Konstanze Zwintz, konstanze.zwintz(at)uibk.ac.at
(End) K. Zwintz [Univ. of Innsbruck, Austria], P. Vannier [CDS] 20-Oct-2017