Re: GSC 3493-1324

[Michael Koppelman <lolife@bitstream.net>]

Well, it looks like Sebastian and the NSVS have sown this one up for 
us. Sebastian's period phases well with my data from a few days ago:

http://www.lolife.com/astronomy/gsc3493-1324/gsc3493-1324.jpg

Here is a detail of the primary eclipse:

http://www.lolife.com/astronomy/gsc3493-1324/gsc3493-1324_detail.jpg

It does not look like we'll get a flat-bottomed eclipse. It appears do 
we have parallax/distance on this, though. Would that make modeling 
more fun?

With a period of 7+ days it does not seem like it makes sense to sit on 
this. The only mystery, as Sebastian mentioned, is that there are some 
TASS points that don't seem like they fit. That does not mean the 
points are bad but it does not sound like a compelling mystery.

Cheers,
Michael Koppelman


On Jun 5, 2004, at 2:08 PM, Sebastian Otero wrote:

> Dear Michael,
>
> This is an EA with a period of 7.6540 days and secondary at phase 0.485
> (slightly eccentric). NSVS data are available to check these stars. I 
> attach
> a plot with the lightcurve.
> Tom, here is my concern regarding false "eclipses" one stumbles upon 
> in TASS
> data. I can throw datapoints away from the other databases looking at 
> the
> flags or rejecting discrepant points made in pairs just  seconds 
> apart. But
> with TASS data I don't have any indication in the file I download. 
> There are
> three points at JD 2453109 that are wrong and I would have used them 
> as a
> true eclipse if only analysing TASS data. They seem consistent with 
> each
> other but they are not.
> Isn't there a way to flag these observations?
>
> Best wishes,
> Sebastian.
>
>
>> Patrick Wils, it appears that the period you came up with on this star
>> is broken now that TASS got some more data. It also doesn't work with
>> the data I got the last couple of nights. In two nights I got one that
>> showed no variation over 5 hours and one that showed a 0.4 mag drop in
>> V over 2.5 hours. I almost got the ToM but clouds moved in. I tried
>> using AVE and Fourier to find a new period to no avail. One could make
>> an educated guess of the ToM from my data as 2453160.7287. That puts
>> the ToM's, in a very loose way, at the following:
>>
>> 2452758.7857
>> 2452781.7331
>> 2452785.7228
>> 2453109.8470
>> 2453160.7287
>>
>> FYI, I'm doing simultaneous V and Rc. The period is long enough on 
>> this
>> (and clear skies rare enough) that I would be appreciative if anyone
>> wanted to grab V data until we figure this guy out. It appears to be a
>> detached system and it is possible, even probable, that we have a
>> flat-bottomed eclipse.
>>
>> Target    : GSC 3493-1324
>> Target RA : 15 58 18.66
>> Target Dec: +48 14 47.55
>> V=11
>>
>> Comp Star : GSC 3493-1212
>> Comp RA   : 15 58 40.516
>> Comp Dec  : +48 12 21.15
>> V=12.3
>>
>> Comp Star : GSC 3493-1088
>> Comp RA   : 15 57 29.096
>> Comp Dec  : +48 19 24.64
>> V=11.9
>>
>> Cheers,
>> Michael Koppelman
>>
>> On Jun 2, 2004, at 6:15 PM, Michael Koppelman wrote:
>>
>>> GSC 3493-1324 looks like a good prospect:
>>>
>>> http://wiki.tass-survey.org/tass/view.do?
>>> nodeId=Tass&contentId=TassJ155818.6%2b481448
>>>
>>> Not a known variable that I can determine. Not referenced in NASA 
>>> ADS.
>>> Doesn't show up in Google except on TASS pages.
>>>
>>> I will probably start in V so if anyone wants to do B, Rc or Ic, let
>>> me know.
> <GSC_3493_1324.gif>