Seismic evidence for non-synchronization in two close sdb+dM binaries from Kepler photometry

Herbert Pablo; Steven D. Kawaler; M. D. Reed; S. Bloemen; S. Charpinet; H. Hu; J. Telting; R. H. Østensen; A. S. Baran; E. M. Green; J. J. Hermes; T. Barclay; S. J. O'Toole; Fergal Mullally; D. W. Kurtz; J. Christensen-Dalsgaard; Douglas A. Caldwell; Jessie L. Christiansen; K. Kinemuchi

doi:10.1111/j.1365-2966.2012.20707.x

Seismic evidence for non-synchronization in two close sdb+dM binaries from Kepler photometry

Herbert Pablo, Steven D. Kawaler, M. D. Reed, S. Bloemen, S. Charpinet, H. Hu, J. Telting, R. H. Østensen, A. S. Baran, E. M. Green, J. J. Hermes, T. Barclay, S. J. O'Toole, Fergal Mullally, D. W. Kurtz, J. Christensen-Dalsgaard, Douglas A. Caldwell, Jessie L. Christiansen, K. Kinemuchi

Steward Observatory

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51 Scopus citations

Abstract

We report on extended photometry of two pulsating subdwarf B (sdB) stars in close binaries. For both cases, we use rotational splitting of the pulsation frequencies to show that the sdB component rotates much too slowly to be in synchronous rotation. We use a theory of tidal interaction in binary stars to place limits on the mass ratios that are independent of estimates based on the radial velocity curves. The companions have masses below 0.26 M_⊙. The pulsation spectra show the signature of high-overtone g-mode pulsation. One star, KIC 11179657, has a clear sequence of g modes with equal period spacings as well as several periodicities that depart from that trend. KIC 02991403 shows a similar sequence, but has many more modes that do not fit the simple pattern.

Original language	English (US)
Pages (from-to)	1343-1351
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	422
Issue number	2
DOIs	https://doi.org/10.1111/j.1365-2966.2012.20707.x
State	Published - May 2012

Keywords

Binaries: Close
Stars: Horizontal branch
Stars: Oscillations
Stars: Rotation
Subdwarfs

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1111/j.1365-2966.2012.20707.x

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Pablo, H., Kawaler, S. D., Reed, M. D., Bloemen, S., Charpinet, S., Hu, H., Telting, J., Østensen, R. H., Baran, A. S., Green, E. M., Hermes, J. J., Barclay, T., O'Toole, S. J., Mullally, F., Kurtz, D. W., Christensen-Dalsgaard, J., Caldwell, D. A., Christiansen, J. L., & Kinemuchi, K. (2012). Seismic evidence for non-synchronization in two close sdb+dM binaries from Kepler photometry. Monthly Notices of the Royal Astronomical Society, 422(2), 1343-1351. https://doi.org/10.1111/j.1365-2966.2012.20707.x

Pablo, H, Kawaler, SD, Reed, MD, Bloemen, S, Charpinet, S, Hu, H, Telting, J, Østensen, RH, Baran, AS, Green, EM, Hermes, JJ, Barclay, T, O'Toole, SJ, Mullally, F, Kurtz, DW, Christensen-Dalsgaard, J, Caldwell, DA, Christiansen, JL & Kinemuchi, K 2012, 'Seismic evidence for non-synchronization in two close sdb+dM binaries from Kepler photometry', Monthly Notices of the Royal Astronomical Society, vol. 422, no. 2, pp. 1343-1351. https://doi.org/10.1111/j.1365-2966.2012.20707.x

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title = "Seismic evidence for non-synchronization in two close sdb+dM binaries from Kepler photometry",

abstract = "We report on extended photometry of two pulsating subdwarf B (sdB) stars in close binaries. For both cases, we use rotational splitting of the pulsation frequencies to show that the sdB component rotates much too slowly to be in synchronous rotation. We use a theory of tidal interaction in binary stars to place limits on the mass ratios that are independent of estimates based on the radial velocity curves. The companions have masses below 0.26 M⊙. The pulsation spectra show the signature of high-overtone g-mode pulsation. One star, KIC 11179657, has a clear sequence of g modes with equal period spacings as well as several periodicities that depart from that trend. KIC 02991403 shows a similar sequence, but has many more modes that do not fit the simple pattern.",

keywords = "Binaries: Close, Stars: Horizontal branch, Stars: Oscillations, Stars: Rotation, Subdwarfs",

author = "Herbert Pablo and Kawaler, {Steven D.} and Reed, {M. D.} and S. Bloemen and S. Charpinet and H. Hu and J. Telting and {\O}stensen, {R. H.} and Baran, {A. S.} and Green, {E. M.} and Hermes, {J. J.} and T. Barclay and O'Toole, {S. J.} and Fergal Mullally and Kurtz, {D. W.} and J. Christensen-Dalsgaard and Caldwell, {Douglas A.} and Christiansen, {Jessie L.} and K. Kinemuchi",

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doi = "10.1111/j.1365-2966.2012.20707.x",

language = "English (US)",

volume = "422",

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AU - Pablo, Herbert

AU - Kawaler, Steven D.

AU - Reed, M. D.

AU - Bloemen, S.

AU - Charpinet, S.

AU - Hu, H.

AU - Telting, J.

AU - Østensen, R. H.

AU - Baran, A. S.

AU - Green, E. M.

AU - Hermes, J. J.

AU - Barclay, T.

AU - O'Toole, S. J.

AU - Mullally, Fergal

AU - Kurtz, D. W.

AU - Christensen-Dalsgaard, J.

AU - Caldwell, Douglas A.

AU - Christiansen, Jessie L.

AU - Kinemuchi, K.

PY - 2012/5

Y1 - 2012/5

N2 - We report on extended photometry of two pulsating subdwarf B (sdB) stars in close binaries. For both cases, we use rotational splitting of the pulsation frequencies to show that the sdB component rotates much too slowly to be in synchronous rotation. We use a theory of tidal interaction in binary stars to place limits on the mass ratios that are independent of estimates based on the radial velocity curves. The companions have masses below 0.26 M⊙. The pulsation spectra show the signature of high-overtone g-mode pulsation. One star, KIC 11179657, has a clear sequence of g modes with equal period spacings as well as several periodicities that depart from that trend. KIC 02991403 shows a similar sequence, but has many more modes that do not fit the simple pattern.

AB - We report on extended photometry of two pulsating subdwarf B (sdB) stars in close binaries. For both cases, we use rotational splitting of the pulsation frequencies to show that the sdB component rotates much too slowly to be in synchronous rotation. We use a theory of tidal interaction in binary stars to place limits on the mass ratios that are independent of estimates based on the radial velocity curves. The companions have masses below 0.26 M⊙. The pulsation spectra show the signature of high-overtone g-mode pulsation. One star, KIC 11179657, has a clear sequence of g modes with equal period spacings as well as several periodicities that depart from that trend. KIC 02991403 shows a similar sequence, but has many more modes that do not fit the simple pattern.

KW - Binaries: Close

KW - Stars: Horizontal branch

KW - Stars: Oscillations

KW - Stars: Rotation

KW - Subdwarfs

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JF - Monthly Notices of the Royal Astronomical Society

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Seismic evidence for non-synchronization in two close sdb+dM binaries from Kepler photometry

Abstract

Keywords

ASJC Scopus subject areas

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