CCD light curves for the double Cepheid CE CAS

Details CCD light curves for the double Cepheid CE CAS CCD light curves for the double Cepheid CE CAS

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1677o&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Nov. 1988, p. 1677-1681.

Other

5

Cepheid Variables, Charge Coupled Devices, Light Curve, Stellar Magnitude, Color-Magnitude Diagram, Fourier Series, Open Clusters, Phase Shift, Stellar Spectrophotometry

Scientific paper

CE Cas a and b in NGC 7790 are separated by 2.3arcsec and thus cannot be measured individually by conventional photometric techniques. The authors observed the pair over a period of 3 yr with CCD detectors, using modern point-spread-function deconvolution techniques to determine magnitudes. Observations were primarily in the V band, although some B observations were made. The V light curves show a definite phase shift (particularly for CE Cas a) when compared to previous determinations. The authors have determined new periods and epochs of V maxima. For comparison with other observations, they fit the data to three-term Fourier expansions, and conclude that previous intensity-averaged magnitudes and colors are consistent to ≡0.05 mag, which is comparable to the measurement errors.

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