Physics
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010javso..38...45w&link_type=abstract
The Journal of the American Association of Variable Star Observers, vol. 38, no. 1, p. 45
Physics
Scientific paper
Visual observations of NSV 19431 and YY Cen spanning the twentyeight years 1980 through 2007 are discussed. These show NSV 19431 is a Mira star of mean period of 298.1 days and visual brightness range of 10.8 to fainter than 15.0. Elements for determining the dates of maximum brightness are JD 2447700 ± 298.1 days (±10 days). The O-C diagram shows what appear to be random cycleto-cycle fluctuations with a current mean cycle of 298.1 days, evident from the maximum of JD 2447700 (1989).
YY Cen is a Mira star of mean period 371.3 days and brightness range 10.6 to fainter than 15.0. On at least three occasions during this twenty-eight years YY Cen has experienced individual cycles that are significantly longer or shorter than the 371.3-day mean period. Subsequent cycles remain close to the mean period but there is a resulting clear shift in the O-C values. Elements for predicting the dates of maximum brightness are JD2446897 ± 371.3 days (±10 days), but they should be treated with some caution due to the random instances of long/short cycles observed thus far and which may prove to be a long term characteristic of YY Cen.
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