OTO - Ohshima Tamashima Observatory- - periodicity of KT Eri Diff

!Analysis of the periodicity in KT Eri
*Analyzed Photometric [[Data|KT Eri (Nova Eri 2009)]]
Analysised photometric data are consit of 7521 points from JD=2455228 to 2455272
which are not only my own observation but also AAVSO's .

*Analysis methods

PDM and DFT
Peranso Version 2.31 (C)CBA Belgium Observatory

*Results

There seems to be three periods which are 5day(or 2.5day), 0.5day and 0.03day.

(1)  5-day(or 2.5day) Period - Orbital one? -

[[/novae/eri_kt/obital_peri_KT_Eri.gif]]


P1=5.2288 day
[[/novae/eri_kt/p5_2288.gif]]
(or 2.6339day)
[[/novae/eri_kt/p2_6339.gif]]



(2)0.5-day Period

  P2=0.4958 P=0.4958 day

[[/novae/eri_kt/p0_4958.gif]]

(3)Less than 0.05-day Period -temporary QPO

for example in JD=2455214
[[/novae/eri_kt/KT_Eri20100117_7av@OTO.gif]][[/novae/eri_kt/KT_Eri20100117_qpo@OTO.gif]]
[[/novae/eri_kt/KT_Eri20100117V_7av@OTO.gif]],


JD=2455236
[[/novae/eri_kt/kt_eri20100208V@OTO.gif]]


[[KT_Eri20100117V_7av@OTO.gif]],and JD=2455248
[[2455236|http://otobs.org/novae/eri_kt/kt_eri20100208V@OTO.gif]] and
[[2455248|http://otobs.org/novae/eri_kt/kt_eri20100220@OTO.gif]].[[/novae/eri_kt/kt_eri20100220@OTO.gif]].



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