2017A&A...608A.103Z


Query : 2017A&A...608A.103Z

2017A&A...608A.103Z - Astronomy and Astrophysics, volume 608A, 103-103 (2017/12-1)

Constraining the near-core rotation of the γ Doradus star 43 Cygni using BRITE-Constellation data.

ZWINTZ K., VAN REETH T., TKACHENKO A., GOSSL S., PIGULSKI A., KUSCHNIG R., HANDLER G., MOFFAT A.F.J., POPOWICZ A., WADE G. and WEISS W.W.

Abstract (from CDS):

Context. Photometric time series of the γ 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.
Aims. 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.
Methods. We conducted a frequency analysis using the 156-day 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 spectroscopic data with high signal-to-noise ratio 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).
Results. 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 ΔΠl=1 of 2970–570+700s. The near-core rotation rate was determined to be frot=0.56–0.14+0.12d–1. The atmosphere of 43 Cyg shows solar chemical composition at an effective temperature, Teff, of 7150±150K, a logg of 4.2±0.6dex, and a projected rotational velocity, υsini, of 44±4km/s.
Conclusions. The morphology of the observed period-spacing patterns shows indications of a significant chemical gradient in the stellar interior.

Abstract Copyright: © ESO, 2017

Journal keyword(s): asteroseismology - stars: individual: 43 Cygni - stars: interiors - stars: oscillations - stars: fundamental parameters - stars: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/608/A103): 43cyg.dat>

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 UCAC4 700-065436 SB* 19 05 57.9247248120 +49 56 33.542968092   12.647 12.155 12.114   ~ 13 0
2 2MASS J19120273+4742364 Pu* 19 12 02.7395758512 +47 42 36.406192932           B8.3V 60 0
3 TYC 3129-2465-1 Pu* 19 13 57.9409700304 +43 04 57.941776668   12.59 12.18     F5Vaw 14 0
4 TYC 3562-121-1 Er* 19 52 37.5094311336 +48 38 43.971786744   10.42 10.02     F5IV 15 0
5 HD 188565 dS* 19 53 51.7230650664 +44 43 09.469359732   10.35 9.92     F0 16 0
6 * 43 Cyg gD* 20 27 02.2674936096 +49 23 00.104394552   6.024 5.715     F0V: 56 0

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2023.01.31-08:46:16

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