AB Nor: A New SU UMa star with P=0.082d
R. Stubbings detected an outburst (14.0mag) of AB Nor on August 31. AB
Nor is most likely an SU UMa-type dwarf nova. The last long outburst (presumably
superoutburst) was observed in 2000 April, with a prominent precursor. The
light curve obtained by B. Monard showed possible superhumps with amplitudes
< 0.1mag (vsnet-campaign-dn
2769, 2784).
The data by P. Nelson confirmed these growing humps. Using these data
sets, T. Kato calculated the best superhump period of 0.0820(2) d (vsnet-campaign-dn
2786, 2790).
These results almost confirmed the SU UMa-type nature of AB Nor. On Sep.
4, the light curve obtained by P. Nelson showed superhumps fully developed
(amplitude near 0.3 mag) with a characteristic triangluar profile (vsnet-campaign-dn
2800). The light curve obtained by P. Nelson on September 11 showed superhumps
with amplitudes of 0.15mag (vsnet-campaign-dn
2838). T. Kato reported that the entire behavior of superhumps was
no longer expressed by a single period at that time. Timing analysis suggested
that there was a large period change, as was seen in V877 Ara and KK Tel
(vsnet-campaign-dn
2844). A rapid fading was observed on September 12, but superhumps
was still clearly detected at that time (vsnet-campaign-dn
2833, 2850).
A possible rebrightening was reported (vsnet-campaign-dn
2854).
Other articles:
vsnet-campaign-dn
2770, 2794,
2797,
2798
Links:
Light curve of growing superhumps:
/vsnet/ftpfile/DNe/AB_Nor/absh.gif
[vsnet-campaign-dn
2786]
VSNET special page for this object:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/abnor.html