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(1993 May 27)
subject:revised period of V344 Lyr
V344 Lyr (UGSU)
Analysis of the V-band CCD frames on May 25 and 26 yields following
update. The observations were made using 60-cm reflector at Ouda Station
(Nara, Japan), Kyoto University.
1) Nightly magnitude
Using GSC V=10.9 as a standard, the ranges of variability were
V = 14.0 - 14.3 (May 25), and V = 14.2 - 14.4 (May 26).
This rate of decline is typical for a superoutburst of an SU UMa-type
dwarf nova.
2) Amplitude of variation
The amplitude of superhumps decreased from 0.34 mag on May 25 to
0.2 mag on May 26.
3) The light curve
The light curves showed steeper rise and slower decline, which are
typical for superhumps in an early phase of development.
No secondary maxima were detectable.
4) The times of maxima and revised superhump period
May UT E O-C
25.601 0 -0.002
25.693 1 -0.001
25.788 2 0.003
26.608 11 0.001
26.698 12 -0.000
26.789 13 -0.001
O-C's are calculated using the formula:
Max.UT = 25.603 + 0.09132 E
The revised superhump period is thus 0.09132 +/- 0.00010 day,
which is one of the longest known among SU UMa-type dwarf novae
below the period gap (cf. YZ Cnc P_SH = 0.09204 day).
Regards,
Taichi Kato (Kyoto University)
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
