Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...395..192c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 395, no. 1, p. 192-201.
Astronomy and Astrophysics
Astrophysics
29
Fourier Analysis, Globular Clusters, Lyra Constellation, Stellar Oscillations, Variable Stars, Astronomical Observatories, Galactic Structure, Metallicity
Scientific paper
The Fourier phase parameter Phi31 has been determined for RRc stars in five globular clusters, NGC 6171, M5, M3, M53, and M15. The results indicate that the RRc stars in a given cluster show a sequence of Phi31 increasing with period, and that the higher the cluster metallicity, the higher the sequence lies in a plot of Phi31 with period. The Phi31 values for the stars in NGC 6171 and M5 presented here are based on observations made with the University of Toronto 0.61 m telescope at Las Campanas, Chile, while those for M3, M53, and M15 are based on published data. A bootstrap procedure has been used to establish the uncertainties in the Fourier parameters. The physical significance of the relationship among Phi31, period, and metallicity is not yet understood. It will need to be tested with hydrodynamic pulsation models computed with new opacities.
Clement Christine M.
Jankulak Michael
Simon Norman R.
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