CW Mon: Rare Outburst in October-November
The SS Cyg-type dwarf nova CW Mon experienced a relatively rare full outburst
(12.9mag), as reported by D. Taylor on October 29 and M. Simonsen on October
31. The object may be a grazing eclipser with a period of 0.1762 d (vsnet-campaign-dn
2953). An eclipse-like fading (depth 0.2 mag in V, duration ~40 min)
was clearly recorded in the Nov. 3 long observation by S. Kiyota. Although
the feature became less sharp, a similar fading was observed also on
Nov. 4. These observations, together with the suggested large inclination,
suggest that these fadings correspond to grazing eclipses as seen in U
Gem (vsnet-campaign-dn
2971). T. Vanmunster reported some small amplitude (~0.1mag) irregularities
in the light curve on November 5/6 (vsnet-campaign-dn
2987, 2998).
S. Kiyota's data on November 5 showed a further brightening of the object
compared with that on November 4 (vsnet-campaign-dn
2988). The object remained at its maximum magnitude on Nov. 6. The
light curve on Nov. 6 was dominated by (rather coherent) QPOs with a time-scale
of ~30 min (vsnet-campaign-dn
2993). The object started fading on November 9. At this time, shallow
(~0.05 mag) eclipses seem to have appeared again. The QPO-like variations
became milder (vsnet-campaign-dn
2973, 2985,
2994,
3004,
3010,
3016,
3017).
Link:
Time-series observations by T. Vanmunster:
http://www.cbabelgium.com
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2997]