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

Mon Nov 21 11:19:36 EST 2005

David,

Also - even though this star has a good sequence, can you please report 
what star or stars you are using for your reductions (and the values you 
are using)?  In this way, everyone's data has a better chance of lining 
up :-)

rick (HUZ)

Richard Huziak wrote:

>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>
>* * * * * * * * * * * * * 
>
>

-- 

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