CoRoT 102749568: mode identification in a δ Scuti star based on regular spacings

被引：17

作者：

Paparo, M. ^{[1
]}

Bognar, Zs. ^{[1
]}

Benko, J. M. ^{[1
]}

Gandolfi, D. ^{[2
]}

Moya, A. ^{[3
]}

Suarez, J. C. ^{[4
]}

Sodor, A. ^{[1
,5
]}

Hareter, M. ^{[1
]}

Poretti, E. ^{[6
]}

Guenther, E. W. ^{[7
]}

Auvergne, M. ^{[8
]}

Baglin, A. ^{[8
]}

Weiss, W. W. ^{[9
]}

机构：

[1] MTA CSFK, Konkoly Observ, H-1121 Budapest, Hungary

[2] ESTEC ESA, Res & Sci Support Dept, NL-2200 AG Noordwijk, Netherlands

[3] INTA CSIC, Ctr Astrobiol, Dept Astrofis, Madrid 28691, Spain

[4] CSIC, Inst Astrofis Andalucia, E-18008 Granada, Spain

[5] Royal Observ Belgium, B-1180 Brussels, Belgium

[6] INAF Osservatorio Astron Brera, Merate, LC, Italy

[7] Thuringer Landessternwarte Tautenburg, D-07778 Tautenburg, Germany

[8] Univ Paris 07, Observ Paris, Univ Paris 06, LESIA, F-92195 Meudon, France

[9] Univ Vienna, Inst Astron, A-1180 Vienna, Austria

来源：

ASTRONOMY & ASTROPHYSICS | 2013年 / 557卷

关键词：

stars: variables: delta Scuti; stars: individual: CoRoT 102749568; stars: oscillations; space vehicles; stars: interiors; EARTH TELESCOPE OBSERVATIONS; ROTATING POLYTROPIC STARS; STELLAR EVOLUTION; MULTIOBJECT SPECTROSCOPY; ACOUSTIC-OSCILLATIONS; NONRADIAL PULSATION; FIELDS IRA01; LIGHT-CURVE; PHOTOMETRY; ASTEROSEISMOLOGY;

D O I：

10.1051/0004-6361/201321792

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. The high accuracy of space data increased the number of the periodicities determined for pulsating variable stars, but the mode identification is still a critical point in the non-asymptotic regime. Aims. We use regularities in frequency spacings for identifying the pulsation modes of the recently discovered delta Sct star ID 102749568. Methods. In addition to analysing CoRoT light curves (15 252 datapoints spanning 131 days), we obtained and analysed both spectroscopic and extended multi-colour photometric data. We applied standard tools (MUFRAN, Period04, SigSpec, and FAMIAS) for time-series analysis. Results. A satisfactory light-curve fit was obtaining by means of 52 independent modes and 15 combination terms. The frequency spacing revealed distinct peaks around large (25.55-31.43 mu Hz), intermediate (9.80, 7.66 mu Hz), and low (2.35 mu Hz) separations. We directly identified 9 modes, and the l and n values of other three modes were extrapolated. The combined application of spectroscopy, multi-colour photometry, and modelling yielded the precise physical parameters and confirmed the observational mode identification. The large separation constrained the log g and related quantities. The dominant mode is the radial first overtone.

引用

页数：13

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