[Aavso-photometry] OT_J0711+44 - third night

[Roger Pickard]

Great stuff Arto.

I too have observed this star on 3 consecutive night now although last 
night was cut short by cloud.

I can't get the full eclipses with my smaller (30cm) telescope but 
nonetheless it's an exciting object.

Thanks for the info from Darragh.

Regards,

Roger
------
Roger Pickard, UK
----- Original Message ----- 
From: "Arto Oksanen" <arto.oksanen at jklsirius.fi>
To: <cba-chat at cba.phys.columbia.edu>; "AAVSO-PHOTOMETRY" 
<aavso-photometry at mira.aavso.org>
Sent: Monday, January 05, 2009 9:31 AM
Subject: [Aavso-photometry] OT_J0711+44 - third night


>
> This year looks really promising, almost every night has been clear 
> in
> Finland! (this cant last long ...)
>
> I got already my third night of data of the new Catalina transient.
> The last run was my longest, 10.5 hours and covering five eclipses.
> The eclipses are still centered on the one magnitude humps and are
> very sharp and very deep. I observed the first eclipse of last night
> by using 10 second exposures and short dead time giving four
> measurements per minute, but even that is too slow for seeing any
> gradual fading. I have been advised by Dr. Darragh O'Donoghue (SAAO)
> that this is typical for eclipsing AM Her stars, as they have very
> tiny luminous areas near the poles of the white dwarf (the extreme
> case of aurora borealis!). The various dips on the light curve are
> caused by the matter streams from the secondary star eclipsing the
> bright spot(s) on the white dwarf.
>
> All night light curve:
> http://murtoinen.dyndns.org/ccd/OT_J0711+44/OT_J071126.0+440405_20090104.png
>
> And the closeup of the first eclipse:
> http://murtoinen.dyndns.org/ccd/OT_J0711+44/eclipse_20090104_1900UT.gif
>
> It would be very interesting to observe this star with a large
> telescope and lets say one second sampling rate. Anyone having 
> access
> to one?  :-)
>
> br,
>
> arto
>
> -- 
> Arto Oksanen
> arto.oksanen at jklsirius.fi
> Muurame, Finland
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