Open AccessAn asteroseismic study of the β Cephei star θ Ophiuchi: photometric results
Author(s) -
Handler G.,
Shobbrook R. R.,
Mokgwetsi T.
Publication year - 2005
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2005.09341.x
Subject(s) - physics , photometry (optics) , astrophysics , photoelectric effect , astronomy , stars , optics
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 u v y 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.