Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106..696a&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 106, no. 701, p. 696-703
Other
9
Periodic Variations, Stellar Luminosity, Variable Stars, Astronomical Photometry, Companion Stars, Long Term Effects, Nonlinearity, Secular Variations
Scientific paper
New photometric photometry and new times of maximum light are reported for the delta Scuti-type star VZ Cancri. Times of maximum light available for the last five decades have been studied. The times of maximum from the last decade, however, indicate that the period has not been steadily increasing as believed until now. To allow for this discrepancy several interpretations of the O-C diagram are discussed. However, the scatter in the (O-C) residuals is large and it is difficult to favor a case between a sloping linear fit and a sinusoidal fit. The former indicates that the main period needs to be revised and a predicted value of 0.17836365 days is obtained. The later suggests the presence of an unseen companion whose nature and implications are briefly discussed. In either case it can be concluded that VZ Cancri is not undergoing any secular period variation. Other possibilities like abrupt period changes and long-term effects of nonlinear combinations of short frequencies are discussed but found unrealistic.
Arellano Ferro Armando
Avila J. J.
Nunez N. S.
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