Frequency analysis of Beta Cephei variables in NGC 6231

Details Frequency analysis of Beta Cephei variables in NGC 6231 Frequency analysis of Beta Cephei variables in NGC 6231

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.205..309b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 205, Oct. 1983, p. 309-320.

Astronomy and Astrophysics

Astronomy

27

Cepheid Variables, Fourier Analysis, Galactic Clusters, Stellar Spectra, Astronomical Catalogs, Open Clusters, Power Spectra, Stellar Evolution, Stellar Spectrophotometry

Scientific paper

Photometric observations are presented for four recently discovered β Cephei variables in the very young open cluster NGC 6231. Fourier analyses of about 500 observations of each star were performed to determine the oscillation frequency spectra. Comparison with variables in NGC 3293 shows that the β Cep stars in NGC 6231 are only slightly evolved from the ZAMS, indicating that the instability strip is at least one magnitude wide. Though the periods of β Cep stars in NGC 6231 are much shorter than those in NGC 3293, the pulsation constants are about the same. The consequences of these findings for the excitation mechanism are discussed.

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