[vsolj-alert 545] RX J0909.8+1849 is a new eclipsing dwarf nova !!

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

RX J0909.8+1849 is a new eclipsing dwarf nova !!

　なんと食のある矮新星でした。周期は4h12mと、UGSS+E型と思われます。

From: "Tonny Vanmunster" <Tonny.Vanmunster@advalvas.be>
Date: Fri, 11 Feb 2000 21:47:34 +0100
Subject: [vsnet-alert 4184] RX J0909.8+1849 is a new eclipsing dwarf nova !!

Hi colleagues,

I started observing RX J0909.8+1849 at CBA Belgium Observatory, using =
the 0.35-m f/6.3 telescope with unfiltered ST-7 CCD, at about 20h08m UT. =
I turned on my "real-time" light curve facility, allowing me to follow =
the evolution of the light curve of this object as closely as possible. =
My first excitement came when I noticed the development of hump-like =
features (with a small amplitude). I'm not sure yet if these are real =
superhumps.

This however was just the beginning of the "show". A little later, the =
variable started a fast fading - entering a deep eclipse - to recover =
about 28 minutes afterwards. You could call it a UG+E detection in =
"real-time".

Here are some first details :

Eclipse depth : 2.5 magnitudes
Eclipse duration (estimate looking at light curve) : 28 minutes
Mid-eclipse (estimate looking at light curve) : 2000 Feb 11.8845 UT

I'll continue monitoring this object for the rest of the night =
(evidently).

What an exciting hobby !

Best regards,
Tonny

From: "Tonny Vanmunster" <Tonny.Vanmunster@advalvas.be>
Date: Sat, 12 Feb 2000 03:13:25 +0100
Subject: [vsnet-alert 4189] RX J0909.8+1849 orbital period 

Dear colleagues,

I have been able to observe a second (consecutive) eclipse of RX =
J0909.8+1849, during tonight's run at CBA Belgium Observatory. This has =
enabled me to determine the orbital period of the system, which is =
0.1751d or 4h12m.=20

This value very well explains the Feb 10.303 UT observation Patrick =
Schmeer refers to in his vsnet-alert message 4183. He has indeed made an =
image at the moment of an eclipse.

Clouds have now entered the Belgian skies. I hope someone else will be =
able to take over on this interesting object ...

Best regards,
Tonny Vanmunster
CBA Belgium Observatory

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