2009A&A...506..111D


Query : 2009A&A...506..111D

2009A&A...506..111D - Astronomy and Astrophysics, volume 506, 111-123 (2009/10-4)

Evidence for nonlinear resonant mode coupling in the β Cephei star HD 180642 (V1449 Aquilae) from CoRoT photometry.

DEGROOTE P., BRIQUET M., CATALA C., UYTTERHOEVEN K., LEFEVER K., MOREL T., AERTS C., CARRIER F., AUVERGNE M., BAGLIN A. and MICHEL E.

Abstract (from CDS):

We present the CoRoT light curve of the β Cep star HD 180642, assembled during the first long run of the space mission, as well as archival single-band photometry. Our goal is to analyse the detailed behaviour present in the light curve and interpret it in terms of excited-mode frequencies. After describing the noise properties in detail, we use various time series analyses and fitting techniques to model the CoRoT light curve, for various physical assumptions. We apply statistical goodness-of-fit criteria that allow us to select the most appropriate physical model fit to the data. We conclude that the light-curve model based on nonlinear resonant frequency and phase locking provides the best representation of the data. Interpretation of the residuals is dependent on the chosen physical model used to prewhiten the data. Our observational results constitute a fruitful starting point for detailed seismic stellar modelling of this large-amplitude and evolved β Cep star.

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: variables: general - stars: individual: HD 180642 (V1449 Aql)

VizieR on-line data: <Available at CDS (J/A+A/506/111): table1.dat table2.dat tables.dat>

Simbad objects: 5

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Number of rows : 5
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 * nu. Eri bC* 04 36 19.1414419 -03 21 08.856678 2.82 3.737 3.928     B2III 380 0
2 HD 49330 bC* 06 47 57.2679459720 +00 46 34.035384504 8.45 9.14 8.95     Bnn(e) 83 0
3 HD 180642 bC* 19 17 14.8038514896 +01 03 33.904495728 7.83 8.47 8.29     B1.5II-III 96 0
4 HD 181072 * 19 18 58.1889268320 +00 59 08.563645068   9.49 9.10     A0 7 0
5 * 12 Lac bC* 22 41 28.6495065456 +40 13 31.609736580 4.24 5.080 5.229     B2III 349 0

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2022.12.08-07:27:45

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