An asteroseismic study of the β Cephei star θ Ophiuchi: Photometric results

G. Handler; R. R. Shobbrook; T. Mokgwetsi

doi:10.1111/j.1365-2966.2005.09341.x

An asteroseismic study of the β Cephei star θ Ophiuchi: Photometric results

G. Handler^*, R. R. Shobbrook, T. Mokgwetsi

^*Corresponding author for this work

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

34 Citations (Scopus)

Abstract

We have carried out a three-site photometric campaign for the β Cephei star θ Oph from 2003 April to August. 245 h of differential photoelectric uvy photometry were obtained during 77 clear nights. The frequency analysis of our measurements has resulted in the detection of seven pulsation modes within a narrow frequency interval between 7.116 and 7.973 c d^-1. No combination or harmonic frequencies have been found. We have performed a mode identification of the individual pulsations from our colour photometry that shows the presence of one radial mode, one rotationally split ℓ = 1 triplet and possibly three components of a rotationally split ℓ = 2 quintuplet. We discuss the implications of our findings and point out the similarity of the pulsation spectrum of θ Oph to that of another β Cephei star, V836 Cen.

Original language	English
Pages (from-to)	612-618
Number of pages	7
Journal	Monthly Notices of the Royal Astronomical Society
Volume	362
Issue number	2
DOIs	https://doi.org/10.1111/j.1365-2966.2005.09341.x
Publication status	Published - 11 Sept 2005

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title = "An asteroseismic study of the β Cephei star θ Ophiuchi: Photometric results",

abstract = "We have carried out a three-site photometric campaign for the β Cephei star θ Oph from 2003 April to August. 245 h of differential photoelectric uvy photometry were obtained during 77 clear nights. The frequency analysis of our measurements has resulted in the detection of seven pulsation modes within a narrow frequency interval between 7.116 and 7.973 c d-1. No combination or harmonic frequencies have been found. We have performed a mode identification of the individual pulsations from our colour photometry that shows the presence of one radial mode, one rotationally split ℓ = 1 triplet and possibly three components of a rotationally split ℓ = 2 quintuplet. We discuss the implications of our findings and point out the similarity of the pulsation spectrum of θ Oph to that of another β Cephei star, V836 Cen.",

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T1 - An asteroseismic study of the β Cephei star θ Ophiuchi

T2 - Photometric results

AU - Handler, G.

AU - Shobbrook, R. R.

AU - Mokgwetsi, T.

PY - 2005/9/11

Y1 - 2005/9/11

N2 - We have carried out a three-site photometric campaign for the β Cephei star θ Oph from 2003 April to August. 245 h of differential photoelectric uvy photometry were obtained during 77 clear nights. The frequency analysis of our measurements has resulted in the detection of seven pulsation modes within a narrow frequency interval between 7.116 and 7.973 c d-1. No combination or harmonic frequencies have been found. We have performed a mode identification of the individual pulsations from our colour photometry that shows the presence of one radial mode, one rotationally split ℓ = 1 triplet and possibly three components of a rotationally split ℓ = 2 quintuplet. We discuss the implications of our findings and point out the similarity of the pulsation spectrum of θ Oph to that of another β Cephei star, V836 Cen.

AB - We have carried out a three-site photometric campaign for the β Cephei star θ Oph from 2003 April to August. 245 h of differential photoelectric uvy photometry were obtained during 77 clear nights. The frequency analysis of our measurements has resulted in the detection of seven pulsation modes within a narrow frequency interval between 7.116 and 7.973 c d-1. No combination or harmonic frequencies have been found. We have performed a mode identification of the individual pulsations from our colour photometry that shows the presence of one radial mode, one rotationally split ℓ = 1 triplet and possibly three components of a rotationally split ℓ = 2 quintuplet. We discuss the implications of our findings and point out the similarity of the pulsation spectrum of θ Oph to that of another β Cephei star, V836 Cen.

KW - Stars: early-type

KW - Stars: individual: θ Oph

KW - Stars: oscillations

KW - Stars: variables: other

KW - Techniques: photometric

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U2 - 10.1111/j.1365-2966.2005.09341.x

DO - 10.1111/j.1365-2966.2005.09341.x

M3 - Article

SN - 0035-8711

VL - 362

SP - 612

EP - 618

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

An asteroseismic study of the β Cephei star θ Ophiuchi: Photometric results

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