Re: GSC 3493-1324

[Sebastian Otero <varsao@fullzero.com.ar>]

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