Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...88...95h&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 88, no. 1, April 1991, p. 95-99.
Astronomy and Astrophysics
Astrophysics
5
Astronomical Photometry, Fourier Analysis, Variable Stars, Color-Color Diagram, Light Curve
Scientific paper
BVRI light curves are presented for the two halo RR Lyrae variables U Caeli, with period 0.420 days (73 observations in 1982 and 37 in 1985/1986) and V Caeli, with period of 0.571 days (42 observations in 1982, 45 in 1985/1986). It is shown that their light curve characteristics are very similar to those of field RR Lyrae stars. U Cae shows Blazhko effect, while V Cae pulsates very regularly. Fourier decompositions are studied for all magnitudes. Differences in the Fourier decomposition parameters between the magnitudes are shown to be relatively small. Comparisons of the Fourier decomposition parameters for the two halo variables with data for field RR Lyrae stars and variables in the globular cluster Omega Centauri show no systematic differences between these groups.
Hansen Leif
Petersen Jørgen Otzen
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