[Aavso-photometry] New variable discovered?

[Dave Lane]

To follow-up on this message from last week, after a record 7 clear 
nights in 10, this star appears to be a eclipsing binary with a period 
very close to one day (or maybe 0.5 days). I submitted it to VSX this 
morning and it has been given the designation:

VSX J133945.4-134746

The latest light curve is (need more data, especially from someone 
further south!) here:

http://www.davelane.ca/aro/ARO133945-134745.gif

--- Dave

Dave Lane wrote:
> Hi,
>
> A few nights ago, quite by accident when inspecting the light curve of 
> an asteroid, a new variable was discovered by my colleague Dan Majaess. 
> This variable is not subtle, but over the course of a bit more than 3 
> hours, it dropped in brightness (unfiltered) by nearly 0.8 magnitudes!
>
> See: http://www.davelane.ca/aro/newvar2.gif (3 other check stars are 
> also shown - SD is about 0.025)
>
> In the next four nights it was "stable" at about V=16, except for the 
> last observation last night when it jumped up about 0.4 mag! I have 
> looked carefully at the 5 frames which are combined to make a single 
> measurement and all individual 60-second frames indicate the same level 
> of brightening.
>
> See: http://www.davelane.ca/aro/newvar1.gif
>
> Has anyone seen this sort of behavior before? I'm fairly new at this, so 
> any idea what type of star this might be and what my next steps should 
> be (other than MORE DATA!)?
>
> Of course, it will be cloudy here for the next several days? Anybody got 
> an automated scope that wouldn't mind adding this field to their late 
> night observation list (in V). Transit is about 130am local.
>
> Cheers,
>
> Dave Lane LDJ
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