[vsnet-alert 16455] Re: (cba:chat) Next HST observations: BB Ari

[Joe Ulowetz]

I'm trying BB Ari right now, but I'm looking low though haze. I can see the
stars 147 and 152, but there is no sign of BB Ari with a 120 sec exposure.
 With 300 sec exposure I'm getting something at the right location with S/N
less than 3 and an uncalibrated magnitude of 18.8.

I'll try later when it's higher, but it is definitely faint right now.

-Joe U.



On Tue, Sep 24, 2013 at 2:48 AM, Boris Gaensicke <
Boris.Gaensicke at warwick.ac.uk> wrote:

> Dear All,
>
> the last few measurements of BB Ari show it brightening by
> about a magnitude over its quiescent level.
>
> This is bad news:If this is the onset of a normal outburst, it
> will not be back in quiescence for Friday's HST observations.
>
> If at all possible, please try to get additional V-band (or
> unfiltered, if it is otherwise too faint) snapshots to monitor
> the behaviour of the star over the next few days - those
> data will be extremely important for deciding how to
> proceed.
>
> Best wishes,
>
> Boris
>
>
>
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>
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