[vsnet-alert 11876] Re: V407 Cyg outburst begin?

[Luboš Brát]

Hi all interested in V407 Cygni.

I've processed the V, Rc and Ic  photometric data of this target, we have 
obtained during year 2009. They cover time from April 09 till end of October 
09. We have observed V407 Cygni in order to get photometric data for 
graduation thesis of Zuzana Fischerova, who study cold components of some 
selected symbiotic variables.
We have obtained about 100 measurments, which shows, that some significant 
brightening has started in September 2009. After some quiescent state during 
months April - August 2009, the object has brightened more than 1 mag during 
September and October 2009.

See the light curves here:
http://var2.astro.cz/EN/v407cyg.php
(Data are available upon request)

In comparison with optical behavior in years 2002 - 2005, the shape of LC in 
2009 was different.
So according to our data, the outburst may began in September 2009. 
Unfortunelly we don't have data after October 31st 2009, which may tell us 
if the brightenning was beginnig of the main outburst or only some 
pre-outburst instability. Photometric data from period November 2009 - 
February 2010 are strongly needed.

With best regards

Lubos Brat
- Variable Star and Exoplanet Section
of Czech Astronomical Society
http://var.astro.cz




----- Original Message ----- 
From: "Taichi Kato" <tkato at kusastro.kyoto-u.ac.jp>
To: <variable_star_forum at yahoogroups.com>; 
<vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp>; <vsnet-alert at yahoogroups.com>; 
<vsnet-campaign-nova at ooruri.kusastro.kyoto-u.ac.jp>; 
<vsnet-campaign-symbio at ooruri.kusastro.kyoto-u.ac.jp>; 
<vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp>; 
<vsnet-outburst at yahoogroups.com>
Sent: Sunday, March 14, 2010 3:07 AM
Subject: [vsnet-alert 11874] Re: V407 Cyg outburst spectra


>> As reported in CBET 2204, broad and narrow components are clearly 
>> visible.
>
>   Just made a quick survey.
>
>   Halpha in V3890 Sgr (18 d after the outburst), also showing similar
> two components:
>
> http://adsabs.harvard.edu/abs/1994MNRAS.269..105A