[vsnet-ecl 2274] Fw: [Aavso-photometry] Request for measurements

[K.Nagai]

----- Original Message -----
>From: "David Boyd" <drsboyd at dsl.pipex.com>
>To: "AAVSO photometry" <aavso-photometry at aavso.org>,
>        "CVnet discussion" <cvnet-discussion at yahoogroups.com>
>Date: Wed, 7 Jun 2006 19:00:37 +0100
>Cc: 
>Subject: [Aavso-photometry] Request for measurements
>
>
>Hi,
>
>I'm hoping to engage some of you to help me solve a problem.
>
>Last autumn I detected variability in the star GSC 3132 1448 which is marked 
as 
>comparison star 131 on the AAVSO chart for MV Lyr. It appears to undergo 
>eclipses of 0.15 mag depth with a period of 7 days 2 mins. As you can imagine
, 
>it is virtually impossible from a single location (I'm in the UK) to confirm 
>whether this is the true period or an integer multiple of the period. I obser
ved 
>the object for the first time this year on 3/4 June and recorded an eclipse a
t 
>almost exactly the predicted time, so I have some confidence that the above 
>period is either the true period or an integer multiple of the period. If the
 
>latter, then the integer is most probably 2, 3 or at most 4.
>
>I would be very grateful for CCD measurements of the differential magnitude 
>between star 131 and star 129 at any of the following times. Use a V filter i
f 
>you have one, otherwise unfiltered will be fine. If you can do this within ha
lf 
>an hour of the stated time, that will be close enough. Try to measure the 
>differential mag as precisely as possible, as the amplitude of 131 is small. 
>Just send me the difference in magnitude between the two stars and the JD you
 
>measured it. Don't bother measuring at other times as that won't reveal much.
 
>I'll send anyone who contributes a measurement a phase diagram showing whethe
r 
>we have managed to determine the true period. Please reply directly to me, no
t 
>to the list.
>
>Thanks for reading this far and hopefully for being curious enough to try
>measuring this object.
>
>Best wishes,
>David Boyd (BDG)
>
>JD
>2453895.199880
>2453897.533625
>2453899.867371
>2453901.034243
>2453902.201116
>2453904.534862
>2453906.868607
>2453908.035480
>2453909.202352
>2453911.536098
>2453913.869843
>2453915.036716
>2453916.203589
>2453918.537334
>2453920.871080
>2453922.037952
>2453923.204825
>2453925.538570
>2453927.872316
>2453929.039189
>2453930.206061
>2453932.539807
>2453934.873552
>2453936.040425
>2453937.207298
>2453939.541043 
>
>
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