[Aavso-photometry] Fw: Variable in field of MV Lyr

[Richard Huziak]

Dave,

Checking to the Suspects Database as I always do with any 'new' discovery', you find that GSC 3132-1448 = 129 comp W = 1904+43E.  The star is now labeled 131 on the 031010 chart.

http://www.aavso.org/observing/charts/Eri-Vul-Suspects.xls

So, it appears that you have proven the variable nature of this star! 
 Now all we have to do if figure out what kind of star it is.  I'll get 
on it asap to help you out.  

You may want to search the IBVS & ADS and see if you can find out who 
first suspected this star - maybe there is more information you can get 
from there.

In the meantime, report your data as 1904+43E.  While you are in the 
field, you may also want to monitor and report the other 4 suspects in 
the field (see the Suspects dbase).  There is no report on the CHET 
about +43E, so it will be Mike S's call as to whether or not thea 0.2 
variation of this star fiddles with the field enough to warrant a chart 
revision for visual observers.

Rick

Mike Simonsen wrote:

>----- Original Message ----- 
>From: "David Boyd" <drsboyd at dsl.pipex.com>
>To: "Mike Simonsen" <mikesimonsen at mindspring.com>
>Sent: Saturday, October 22, 2005 6:07 PM
>Subject: Variable in field of MV Lyr
>
>
>  
>
>>Hi Mike,
>>
>>While carrying out CCD photometry on MV Lyr this summer I noticed that the
>>comparison star marked 131 on the AAVSO chart 031019 was varying. This is
>>    
>>
>GSC
>  
>
>>3132 1448.
>>
>>I've since observed it on most clear nights and seen it vary between 13.04
>>    
>>
>and
>  
>
>>13.28. It also appears to undergo an eclipse but I have so far only been
>>    
>>
>able to
>  
>
>>record one side of this. Using the eclipse as a guide, I estimate the
>>    
>>
>period to
>  
>
>>be 7d 0h 2m 27s, or some integer divisor of this. As you can imagine, this
>>    
>>
>is an
>  
>
>>awkward period to try to cover from one longitude and I can also no longer
>>    
>>
>see
>  
>
>>the eclipses here because it is too low when they occur.
>>
>>I wondered if you would be able to enlist the help of some other observers
>>    
>>
>in
>  
>
>>the CV network to fill in the missing gaps in the light curve and try to
>>    
>>
>clarify
>  
>
>>the true nature of this system.
>>
>>An approximate ephemeris for the eclipse ToM is JD = 2453561.5 with period
>>7.0017d. Note these times are JD, no heliocentric correction applied.
>>
>>I'm also attaching the data points I have so far so you can verify the
>>    
>>
>above
>  
>
>>calculation and give me any feedback you can on the possible nature of the
>>system. All data is V-filtered. Most points are means of several
>>    
>>
>measurements
>  
>
>>and are accurate to 0.01mag or better.
>>
>>Regards,
>>David Boyd (BDG)
>>West Challow Observatory, UK
>>
>>    
>>
>>------------------------------------------------------------------------
>>
>>2453573.481000	13.045
>>2453575.407274	13.211
>>2453575.411036	13.217
>>2453575.414797	13.220
>>2453575.418556	13.224
>>2453575.422309	13.223
>>2453575.426061	13.231
>>2453575.429814	13.231
>>2453575.433566	13.232
>>2453575.437317	13.242
>>2453575.441071	13.238
>>2453575.444823	13.239
>>2453575.448575	13.251
>>2453575.452328	13.242
>>2453575.456531	13.256
>>2453575.461823	13.250
>>2453575.465838	13.254
>>2453575.468652	13.256
>>2453584.469000	13.141
>>2453597.422666	13.127
>>2453603.490797	13.266
>>2453604.401169	13.130
>>2453605.448435	13.137
>>2453605.509988	13.141
>>2453606.403789	13.138
>>2453607.361102	13.063
>>2453609.456498	13.152
>>2453612.364650	13.132
>>2453619.362731	13.130
>>2453631.464707	13.222
>>2453634.334242	13.112
>>2453636.469902	13.072
>>2453639.430883	13.131
>>2453642.489626	13.062
>>2453645.465265	13.235
>>2453648.299384	13.111
>>2453652.355298	13.170
>>2453652.395160	13.184
>>2453652.424672	13.216
>>2453653.283208	13.143
>>2453653.450832	13.137
>>2453654.414938	13.130
>>2453659.389745	13.177
>>2453659.424769	13.214
>>2453659.430109	13.215
>>2453659.435446	13.220
>>2453659.440786	13.227
>>2453659.446126	13.231
>>2453659.451483	13.246
>>2453659.456823	13.242
>>2453659.462161	13.239
>>2453659.467502	13.249
>>2453659.472845	13.249
>>2453659.478184	13.257
>>2453659.483523	13.262
>>2453659.488867	13.278
>>2453664.308889	13.074
>>    
>>
>>------------------------------------------------------------------------
>>
>>_______________________________________________
>>
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>>
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>>
>>
>>    
>>

-- 

* * * * * * * * * * * * *
Richard Huziak
Manufacturing Engineering
SED Systems
Saskatoon, SK, Canada
tel. (306) 933-1676
<huziak at SEDSystems.ca>
* * * * * * * * * * * * *