Multisite campaign on the open cluster M67 - III. δ Scuti pulsations in the blue stragglers

H. Bruntt; D. Stello; J. C. Suárez; T. Arentoft; T. R. Bedding; M. Y. Bouzid; Z. Csubry; T. H. Dall; Z. E. Dind; S. Frandsen; R. L. Gilliland; A. P. Jacob; H. R. Jensen; Y. B. Kang; S. L. Kim; L. L. Kiss; H. Kjeldsen; J. R. Koo; J. A. Lee; C. U. Lee; J. Nuspl; C. Sterken; R. Szabó

doi:10.1111/j.1365-2966.2007.11865.x

Multisite campaign on the open cluster M67 - III. δ Scuti pulsations in the blue stragglers

H. Bruntt, D. Stello, J. C. Suárez, T. Arentoft, T. R. Bedding, M. Y. Bouzid, Z. Csubry, T. H. Dall, Z. E. Dind, S. Frandsen, R. L. Gilliland, A. P. Jacob, H. R. Jensen, Y. B. Kang, S. L. Kim, L. L. Kiss, H. Kjeldsen, J. R. Koo, J. A. Lee, C. U. LeeJ. Nuspl, C. Sterken, R. Szabó

Astronomy & Astrophysics

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Abstract

We have made an asteroseismic analysis of the variable blue stragglers in the open cluster M67. The data set consists of photometric time-series from eight sites using nine 0.6-2.1 m telescopes with a time-baseline of 43 d. In two stars, EW Cnc and EX Cnc, we detect the highest number of frequencies (41 and 26) detected in δ Scuti stars belonging to a stellar cluster, and EW Cnc has the second highest number of frequencies detected in any δ Scuti star. We have computed a grid of pulsation models that take the effects of rotation into account. The distribution of observed and theoretical frequencies shows that in a wide frequency range a significant fraction of the radial and non-radial low-degree modes are excited to detectable amplitudes. Despite the large number of observed frequencies we cannot constrain the fundamental parameters of the stars. To make progress we need to identify the degrees of some of the modes from either multicolour photometry or spectroscopy.

Original language	English (US)
Pages (from-to)	1371-1384
Number of pages	14
Journal	Monthly Notices of the Royal Astronomical Society
Volume	378
Issue number	4
DOIs	https://doi.org/10.1111/j.1365-2966.2007.11865.x
State	Published - Jul 2007

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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Bruntt, H., Stello, D., Suárez, J. C., Arentoft, T., Bedding, T. R., Bouzid, M. Y., Csubry, Z., Dall, T. H., Dind, Z. E., Frandsen, S., Gilliland, R. L., Jacob, A. P., Jensen, H. R., Kang, Y. B., Kim, S. L., Kiss, L. L., Kjeldsen, H., Koo, J. R., Lee, J. A., ... Szabó, R. (2007). Multisite campaign on the open cluster M67 - III. δ Scuti pulsations in the blue stragglers. Monthly Notices of the Royal Astronomical Society, 378(4), 1371-1384. https://doi.org/10.1111/j.1365-2966.2007.11865.x

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title = "Multisite campaign on the open cluster M67 - III. δ Scuti pulsations in the blue stragglers",

abstract = "We have made an asteroseismic analysis of the variable blue stragglers in the open cluster M67. The data set consists of photometric time-series from eight sites using nine 0.6-2.1 m telescopes with a time-baseline of 43 d. In two stars, EW Cnc and EX Cnc, we detect the highest number of frequencies (41 and 26) detected in δ Scuti stars belonging to a stellar cluster, and EW Cnc has the second highest number of frequencies detected in any δ Scuti star. We have computed a grid of pulsation models that take the effects of rotation into account. The distribution of observed and theoretical frequencies shows that in a wide frequency range a significant fraction of the radial and non-radial low-degree modes are excited to detectable amplitudes. Despite the large number of observed frequencies we cannot constrain the fundamental parameters of the stars. To make progress we need to identify the degrees of some of the modes from either multicolour photometry or spectroscopy.",

author = "H. Bruntt and D. Stello and Su{\'a}rez, {J. C.} and T. Arentoft and Bedding, {T. R.} and Bouzid, {M. Y.} and Z. Csubry and Dall, {T. H.} and Dind, {Z. E.} and S. Frandsen and Gilliland, {R. L.} and Jacob, {A. P.} and Jensen, {H. R.} and Kang, {Y. B.} and Kim, {S. L.} and Kiss, {L. L.} and H. Kjeldsen and Koo, {J. R.} and Lee, {J. A.} and Lee, {C. U.} and J. Nuspl and C. Sterken and R. Szab{\'o}",

year = "2007",

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doi = "10.1111/j.1365-2966.2007.11865.x",

language = "English (US)",

volume = "378",

pages = "1371--1384",

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Bruntt, H, Stello, D, Suárez, JC, Arentoft, T, Bedding, TR, Bouzid, MY, Csubry, Z, Dall, TH, Dind, ZE, Frandsen, S, Gilliland, RL, Jacob, AP, Jensen, HR, Kang, YB, Kim, SL, Kiss, LL, Kjeldsen, H, Koo, JR, Lee, JA, Lee, CU, Nuspl, J, Sterken, C & Szabó, R 2007, 'Multisite campaign on the open cluster M67 - III. δ Scuti pulsations in the blue stragglers', Monthly Notices of the Royal Astronomical Society, vol. 378, no. 4, pp. 1371-1384. https://doi.org/10.1111/j.1365-2966.2007.11865.x

TY - JOUR

T1 - Multisite campaign on the open cluster M67 - III. δ Scuti pulsations in the blue stragglers

AU - Bruntt, H.

AU - Stello, D.

AU - Suárez, J. C.

AU - Arentoft, T.

AU - Bedding, T. R.

AU - Bouzid, M. Y.

AU - Csubry, Z.

AU - Dall, T. H.

AU - Dind, Z. E.

AU - Frandsen, S.

AU - Gilliland, R. L.

AU - Jacob, A. P.

AU - Jensen, H. R.

AU - Kang, Y. B.

AU - Kim, S. L.

AU - Kiss, L. L.

AU - Kjeldsen, H.

AU - Koo, J. R.

AU - Lee, J. A.

AU - Lee, C. U.

AU - Nuspl, J.

AU - Sterken, C.

AU - Szabó, R.

PY - 2007/7

Y1 - 2007/7

N2 - We have made an asteroseismic analysis of the variable blue stragglers in the open cluster M67. The data set consists of photometric time-series from eight sites using nine 0.6-2.1 m telescopes with a time-baseline of 43 d. In two stars, EW Cnc and EX Cnc, we detect the highest number of frequencies (41 and 26) detected in δ Scuti stars belonging to a stellar cluster, and EW Cnc has the second highest number of frequencies detected in any δ Scuti star. We have computed a grid of pulsation models that take the effects of rotation into account. The distribution of observed and theoretical frequencies shows that in a wide frequency range a significant fraction of the radial and non-radial low-degree modes are excited to detectable amplitudes. Despite the large number of observed frequencies we cannot constrain the fundamental parameters of the stars. To make progress we need to identify the degrees of some of the modes from either multicolour photometry or spectroscopy.

AB - We have made an asteroseismic analysis of the variable blue stragglers in the open cluster M67. The data set consists of photometric time-series from eight sites using nine 0.6-2.1 m telescopes with a time-baseline of 43 d. In two stars, EW Cnc and EX Cnc, we detect the highest number of frequencies (41 and 26) detected in δ Scuti stars belonging to a stellar cluster, and EW Cnc has the second highest number of frequencies detected in any δ Scuti star. We have computed a grid of pulsation models that take the effects of rotation into account. The distribution of observed and theoretical frequencies shows that in a wide frequency range a significant fraction of the radial and non-radial low-degree modes are excited to detectable amplitudes. Despite the large number of observed frequencies we cannot constrain the fundamental parameters of the stars. To make progress we need to identify the degrees of some of the modes from either multicolour photometry or spectroscopy.

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UR - http://www.scopus.com/inward/citedby.url?scp=34547256255&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2966.2007.11865.x

DO - 10.1111/j.1365-2966.2007.11865.x

M3 - Article

AN - SCOPUS:34547256255

SN - 0035-8711

VL - 378

SP - 1371

EP - 1384

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

Multisite campaign on the open cluster M67 - III. δ Scuti pulsations in the blue stragglers

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