[Aavso-photometry] Help with followup requested

[Patrick Wiggins]

Hi,

A few nights ago I was working HD149026 trying to come up with a light  
curve of its known exo-planet's transit (something I'd done  
successfully before).

When I reduced the data I had a nice curve but not the one I had been  
expecting.  In fact I'd erred and used such a long exposure that the  
target star had saturated the chip so it's data were useless.

However, the graph showed that the star I'd used as a check star  
contained a very nice curve.

I've used that same star as a check star before but never had this  
"problem".

So I contacted Bruce Gary at AXA who looked over my data and said that  
the change in brightness was probably too large to have been made by  
an exo-planet but that it could have been made by a red dwarf  
eclipsing binary.

He did some checking and said he could not find this EB (if that's  
what it is) had been reported before.

I've snail-mailed him a DVD with my images for him to examine further  
but in the mean time he said I should ask others to observe the object  
in hopes of establishing a period for it.

Here is an image of the field in question with HD149026 being marked  
as "V" and the star that created the curve marked as "2":
http://users.wirelessbeehive.com/~paw/temp/MYSTERY01.JPG

And here is a screen save of the curve (red is the worthless curve  
made from the saturated HD149026 and the blue shows the curve created  
by star "2":
http://users.wirelessbeehive.com/~paw/temp/MYSTERY02.JPG

HD149026 is located at RA 16:30:30.0, DEC +38:20:42.

We've had nothing but bad weather here since the night of the  
"discovery" so I'd appreciate it if others could occasionally have a  
go at catching this one in the act.

Clear skies!

patrick
718