[vsnet-campaign 575] Re: TV Col outburst: observations needed! - why?

[Taichi Kato <tkato>]

Re: TV Col outburst: observations needed! - why?

  (Please use vsnet-ip and vsnet-campaign-ip for further comments).

> What's the motivation for the observations? This behaviour of TV Col is
> well known (Szkody \& Mateo 1984; Schwartz et al. 1988; Hellier \& Buckley
> 1993; Augusteijn et al. 1994). These are only fast (less than 1-d)
> mini-outbursts (1-2 mags). They are most likely mass transfer events.
> TV Col has almost certainly returned to its normal brightness by now
> (or will do it by tomorrow). If the outburst continues for long, then
> observations are really important, but it is unlikely.

   The motivation is exactly what was shown in Hellier and Buckley 1993.
They report that the outburst they observed was the only fourth known
outburst of TV Col -- well deserves further study!  The only previously
spectroscopically recorded phenomenon before Hellier and Buckley 1993
was the second one of double outbursts separeated by 8 days (Schwartz et al.
1988), which might have been affected by the preceding outburst.
Outbursts of IPs are still poorly understood, partly because of low
frequency and irregular interval.  All available outbursts still need to
be closely investigated.  Hellier and Buckley 1993 reported a possible
eclipse-like fading during outburst, but the observation only covered
a fraction of the orbital period which made the identification difficult.
The existence of such phenomena may be examined during the current, very
favorably located, outburst.

Regards,
Taichi Kato

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