[vsnet-alert 16198] Re: V2289 Cyg outburst

[Taichi Kato]

Re: V2289 Cyg outburst

> We detected that a dwarf nova V2289 Cyg, an UG type with a range of
> 15.7-<19.0 mag(V), in outburst at around 16 mag on Aug. 12.60(UT) from 
> Youichirou Nakashima's survey images with Canon 500-mm f/4.5 camera
> lens + SBIG ST-8 in the course of the MISAO Project.

   Porb = 0.142 d according to RKCat (Thorstensen, in a poster paper).
So it's likely an SS Cyg-type.

Kepler Input Catalog:
1	 1.116	19 34 36.197	+51 07 42.39	12361025	293.650820	+51.128441 	 	16.918	17.015	17.143	15.858	15.399	17.086	0	0	0	1

   The reference to VSNET in AAVSO VSX is incorrect.
The correct one is:

http://www.kusastro.kyoto-u.ac.jp/vsnet/Mail/alert5000/msg00142.html

1H 1933+510 outburst (Bryja)

Date: Sun, 23 Jul 2000 04:03:37 -0500
From: cob585f <cob585f at mail.smsu.edu>

To anyone interested:

I have found the "nova-like" CV 1H 1933+510 = Cyg2 in the Downes & Shara
catalogue (1987, PASP 105:127) to be more than three magnitudes high.
Clouds are coming in at my location, but I have been observing it since
5.85 UT (July 23, 2000). It's now 8.5 UT, and I have taken several CCD
images.

Downes & Shara list this star as "nova-like" which implies it's not a
dwarf nova. If this is correct the star is most likely a VY Scl star
that's been spending a lot of time in the low state. However, I think
it's likely a dwarf nova of some kind because of its photometric
behavior. I need to confess that because of a mis-ID on a finding chart
I failed to notice an earlier outburst that (luckily) I caught on the CCD
frame anyway in November 1999. The mistaken identification on the earlier
images was something I just discovered a month ago, but they all have
the correct star visible in the field. I have observed this star in
June 1999, November 1999 (outburst), and then on multiple occasions
from late May 2000 to the present. Except for the November 1999
outburst, the star has stayed fainter than 17th magnitude. Because
of the earlier outburst, I've been trying to observe it every chance
I get to see if the outburst repeats. Well, tonight it did! It's
again up at least three magnitudes, and there is no mistake about
which star it is this time.

I lack the equipment necessary to get good time resolution which would
help settle the question of what type of CV this star is. I'm posting
this in the hope that someone else can pick up the observations where
I'm about to leave them off. The orbital period of this star in listed
in a table in Warner's book at approximately 3.3 hours. Even if I could
get good time resolution, the clouds here are doing me in. I haven't
been able to observe continuously because of them and high humidity.

So I hope I can pass the baton to someone else who can follow up on
this.
-- Claia Bryja
Southwest Missouri