Kepler observations of rapidly oscillating Ap, δ Scuti and γ Doradus pulsations in Ap stars

L. A. Balona; M. S. Cunha; D. W. Kurtz; I. M. Brandão; M. Gruberbauer; H. Saio; R. Østensen; V. G. Elkin; W. J. Borucki; J. Christensen-Dalsgaard; H. Kjeldsen; D. G. Koch; S. T. Bryson

doi:10.1111/j.1365-2966.2010.17461.x

Kepler observations of rapidly oscillating Ap, δ Scuti and γ Doradus pulsations in Ap stars

L. A. Balona, M. S. Cunha, D. W. Kurtz, I. M. Brandão, M. Gruberbauer, H. Saio, R. Østensen, V. G. Elkin, W. J. Borucki, J. Christensen-Dalsgaard, H. Kjeldsen, D. G. Koch, S. T. Bryson

Research output: Contribution to journal › Article › peer-review

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Abstract

Observations of the A5p star KIC 8677585 obtained during the Kepler 10-d commissioning run with 1-min time resolution show that it is a rapidly oscillating Ap (roAp) star with several frequencies with periods near 10 min. In addition, a low frequency at 3.142 d^-1 is also clearly present. Multiperiodic γ Doradus (γDor) and δ Scuti (δ Sct) pulsations, never before seen in any Ap star, are present in Kepler observations of at least three other Ap stars. Since γ Dor pulsations are seen in Ap stars, it is likely that the low frequency in KIC 8677585 is also a γ Dor pulsation. The simultaneous presence of both γ Dor and roAp pulsations and the unexpected detection of δ Sct and γ Dor pulsations in Ap stars present new opportunities and challenges for the interpretation of these stars. Since it is easy to confuse Am and Ap stars at classification dispersions, the nature of these Ap stars in the Kepler field needs to be confirmed.

Original language	English
Pages (from-to)	517-524
Number of pages	8
Journal	Monthly Notices of the Royal Astronomical Society
Volume	410
Issue number	1
DOIs	https://doi.org/10.1111/j.1365-2966.2010.17461.x
Publication status	Published - 2011 Jan
Externally published	Yes

Keywords

Asteroseismology
Stars: chemically peculiar
Stars: oscillations
Stars: variables: general

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1111/j.1365-2966.2010.17461.x

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Balona, L. A., Cunha, M. S., Kurtz, D. W., Brandão, I. M., Gruberbauer, M., Saio, H., Østensen, R., Elkin, V. G., Borucki, W. J., Christensen-Dalsgaard, J., Kjeldsen, H., Koch, D. G., & Bryson, S. T. (2011). Kepler observations of rapidly oscillating Ap, δ Scuti and γ Doradus pulsations in Ap stars. Monthly Notices of the Royal Astronomical Society, 410(1), 517-524. https://doi.org/10.1111/j.1365-2966.2010.17461.x

Balona, LA, Cunha, MS, Kurtz, DW, Brandão, IM, Gruberbauer, M, Saio, H, Østensen, R, Elkin, VG, Borucki, WJ, Christensen-Dalsgaard, J, Kjeldsen, H, Koch, DG & Bryson, ST 2011, 'Kepler observations of rapidly oscillating Ap, δ Scuti and γ Doradus pulsations in Ap stars', Monthly Notices of the Royal Astronomical Society, vol. 410, no. 1, pp. 517-524. https://doi.org/10.1111/j.1365-2966.2010.17461.x

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abstract = "Observations of the A5p star KIC 8677585 obtained during the Kepler 10-d commissioning run with 1-min time resolution show that it is a rapidly oscillating Ap (roAp) star with several frequencies with periods near 10 min. In addition, a low frequency at 3.142 d-1 is also clearly present. Multiperiodic γ Doradus (γDor) and δ Scuti (δ Sct) pulsations, never before seen in any Ap star, are present in Kepler observations of at least three other Ap stars. Since γ Dor pulsations are seen in Ap stars, it is likely that the low frequency in KIC 8677585 is also a γ Dor pulsation. The simultaneous presence of both γ Dor and roAp pulsations and the unexpected detection of δ Sct and γ Dor pulsations in Ap stars present new opportunities and challenges for the interpretation of these stars. Since it is easy to confuse Am and Ap stars at classification dispersions, the nature of these Ap stars in the Kepler field needs to be confirmed.",

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author = "Balona, {L. A.} and Cunha, {M. S.} and Kurtz, {D. W.} and Brand{\~a}o, {I. M.} and M. Gruberbauer and H. Saio and R. {\O}stensen and Elkin, {V. G.} and Borucki, {W. J.} and J. Christensen-Dalsgaard and H. Kjeldsen and Koch, {D. G.} and Bryson, {S. T.}",

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doi = "10.1111/j.1365-2966.2010.17461.x",

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AU - Balona, L. A.

AU - Cunha, M. S.

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AU - Brandão, I. M.

AU - Gruberbauer, M.

AU - Saio, H.

AU - Østensen, R.

AU - Elkin, V. G.

AU - Borucki, W. J.

AU - Christensen-Dalsgaard, J.

AU - Kjeldsen, H.

AU - Koch, D. G.

AU - Bryson, S. T.

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N2 - Observations of the A5p star KIC 8677585 obtained during the Kepler 10-d commissioning run with 1-min time resolution show that it is a rapidly oscillating Ap (roAp) star with several frequencies with periods near 10 min. In addition, a low frequency at 3.142 d-1 is also clearly present. Multiperiodic γ Doradus (γDor) and δ Scuti (δ Sct) pulsations, never before seen in any Ap star, are present in Kepler observations of at least three other Ap stars. Since γ Dor pulsations are seen in Ap stars, it is likely that the low frequency in KIC 8677585 is also a γ Dor pulsation. The simultaneous presence of both γ Dor and roAp pulsations and the unexpected detection of δ Sct and γ Dor pulsations in Ap stars present new opportunities and challenges for the interpretation of these stars. Since it is easy to confuse Am and Ap stars at classification dispersions, the nature of these Ap stars in the Kepler field needs to be confirmed.

AB - Observations of the A5p star KIC 8677585 obtained during the Kepler 10-d commissioning run with 1-min time resolution show that it is a rapidly oscillating Ap (roAp) star with several frequencies with periods near 10 min. In addition, a low frequency at 3.142 d-1 is also clearly present. Multiperiodic γ Doradus (γDor) and δ Scuti (δ Sct) pulsations, never before seen in any Ap star, are present in Kepler observations of at least three other Ap stars. Since γ Dor pulsations are seen in Ap stars, it is likely that the low frequency in KIC 8677585 is also a γ Dor pulsation. The simultaneous presence of both γ Dor and roAp pulsations and the unexpected detection of δ Sct and γ Dor pulsations in Ap stars present new opportunities and challenges for the interpretation of these stars. Since it is easy to confuse Am and Ap stars at classification dispersions, the nature of these Ap stars in the Kepler field needs to be confirmed.

KW - Asteroseismology

KW - Stars: chemically peculiar

KW - Stars: oscillations

KW - Stars: variables: general

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Kepler observations of rapidly oscillating Ap, δ Scuti and γ Doradus pulsations in Ap stars

Abstract

Keywords

ASJC Scopus subject areas

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