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AAVSO News Flash No. 83 (Dec. 9) tells that the long-period dwarf nova DX And may be rising to outburst (due?). Extract from the news flash:
----------------------------------------------------------------------------- DX ANDROMEDAE
AAVSO Observer
UT Mag. Initials
DEC 04.862 14.8 PYG
DEC 09.0417 13.8 GRI
DEC 09.1569 13.8 GRI
----------------------------------------------------------------------------- (PYG - G. Poyner, England; GRI - J. Griese, USA)
The present early detection, if confirmed, of an outburst of DX And might provide another (the others I mean recent events of CH UMa and GK Per) excellent opportunity in probing the accretion disks in dwarf novae having long orbital periods, whose outbursts seem to start from the inner part of accretion disks. GK Per and CH UMa all showed a "plateau" before reaching maximum light, during which the heating wave seems to propagate through the accretion disk inside-out (Kim et al. 1992). Follow-up (multicolor and time-resolved) observations are recommended at this moment of the event.
References (GK Per):
A. Bianchini et al. 1986, A&A 160, 367 (analysis of light curve)
S. -W. Kim et al. 1992, ApJ 384, 269 (dwarf nova-type model)
Regards,
Taichi Kato
(from CVC 117)
DX And [UG, 10.9p - 16.4p] ==========================
The ongoing DX And outburst, first announced in CVC 116, seems to be a quite unusual one, due to its faintness. The variable did not yet become brighter than mag. 12.7 during the present outburst, which is the faintest recorded maximum magnitude of DX And in the Outburst Activity Database on Selected Cataclysmic Variables, except for an outburst in January 1981 (when a maximum magnitude of 12.9 was reported). Since the outburst isn't over yet, we strongly advise to keep on monitoring this object.
------------------------------------------- DATE (UT) MAGN MS OBSERVER ------------------------------------------- 1996 11 08.223 14.9 mv Modic 1996 12 09.042 13.8 mv Griese 1996 12 09.157 13.8 mv Griese 1996 12 10.101 13.9 mv Modic 1996 12 11.388 13.40 CV Ouda 1996 12 12.209 13.5 mv Hanson 1996 12 12.260 13.5 mv Hanson 1996 12 12.70 13.4 mv Pietz 1996 12 13.230 13.6 mv Hanson 1996 12 13.685 13.0 CU Jensen 1996 12 13.922 13.2 mv Broens 1996 12 13.979 12.9 mv Vanmunster 1996 12 14.283 13.7 mv Hanson 1996 12 14.544 13.4 mv Makiguchi 1996 12 14.70 13.4 mv Pietz 1996 12 14.950 13.4 mv Vanmunster 1996 12 15.81 12.7 mv Verdenet
Outburst CCD image
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