Observational studies of 12DD Lacertae |
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| Authors: | Naonobu Sato |
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| Institution: | (1) Dept. of Physics, Akita University, Akita, Japan |
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| Abstract: | Analysis of the light curves of 12DD Lacertae obtained during the years 1918-'71 shows that the primary period,P
1, is decreasing at the rate of about 1 s per 500 yr. The secondary period,P
2, is nearly constant but the third and fourth periods,P
3 andP
4, appear unstable with some irregular changes in frequency and amplitude. It is confirmed that the color in the primary variation is bluest around the phase of a half quarter before maximum light, 0.
P
875. The third variation also shows a similar tendency in color, while the secondary and fourth variations do not seem to show any meaningful color change, presumably indicating that the latter two are different from the pulsational nature of the primary and third variations. The method of power spectrum analysis is further applied to examine the structure of the multiperiodicity in more details and to search for any unknown periods in the light variation. |
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| Keywords: | |
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