The tip of the iceberg: the frequency content of the δ Sct star HD 50844 from CoRoT space photometry

被引：0

作者：

Poretti, E. ^{[1
]}

Mantegazza, L. ^{[1
]}

Rainer, M. ^{[1
]}

Uytterhoeven, K. ^{[1
,2
]}

Michel, E. ^{[3
]}

Baglin, A. ^{[3
]}

Auvergne, M. ^{[3
]}

Catala, C. ^{[3
]}

Samadi, R. ^{[3
]}

Rodriguez, E. ^{[4
]}

Garrido, R. ^{[4
]}

Amado, P. ^{[4
]}

Martin-Ruiz, S. ^{[4
]}

Moya, A. ^{[4
]}

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

Baudin, F. ^{[5
]}

Zima, W. ^{[6
]}

Alvarez, M. ^{[7
]}

Mathias, P. ^{[8
]}

Alvarez, P.

Paparo, M. ^{[9
]}

Papics, P. ^{[9
]}

Plachy, E. ^{[9
]}

机构：

[1] INAF OA Brera, Via E Bianchi 46, I-23807 Merate, Italy

[2] CEA DSM CNRS Univ Paris Diderot, Lab AIM, F-91191 Gif Sur Yvette, France

[3] Observ Paris, CNRS, LESIA, UMR 8109, F-92195 Meudon, France

[4] Inst Astrofisica Andalucia, E-18080 Granada, Spain

[5] Univ Paris XI, Inst Astrophys Spatiale, CNRS, UMR 8617, F-91405 Orsay, France

[6] Inst Voor Sterrenkunde, K U Leuven, B-3001 Heverlee, Belgium

[7] Nacl Astron Observ, UNAM, Ensenada 22860, Baja California, Mexico

[8] UNS, CNRS, OCA, UMR 6525 H Fizeau, F-06108 Nice, France

[9] Konkoly Observ Budapest, H-1525 Budapest, Hungary

来源：

STELLAR PULSATION: CHALLENGES FOR THEORY AND OBSERVATION | 2009年 / 1170卷

关键词：

Stars: variables: delta Sct; Stars: oscillations; Stars: interiors;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

It has been suggested that the detection of a wealth of very low amplitude modes in delta Sct stars was only a matter of signal to noise ratio. Access to this treasure, impossible from the ground, is one of the scientific aims of the space mission CoRoT, developed and operated by CNES. This work presents the results obtained on HD 50844: the 140,016 datapoints allowed us to reach the level of 10(-5) mag in the amplitude spectra. The frequency analysis of the CoRoT timeseries revealed hundreds of terms in the frequency range 0-30 d(-1). The initial guess that delta Sct stars have a very rich frequency content is confirmed. The spectroscopic mode identification gives theoretical support since very high-degree modes (up to l=14) are identified. We also prove that cancellation effects are not sufficient in removing the flux variations associated to these modes at the noise level of the CoRoT measurements. The ground based observations indicate that HD 50844 is an evolved star that is slightly underabundant in heavy elements, located on the Terminal Age Main Sequence. The predominant term (f(1)=6.92 d(-1)) has been identified as the fundamental radial mode combining ground-based photometric and spectroscopic data.

引用

页码：435 / +

页数：2

共 40 条

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