[vsnet-alert 19531] Re: V2492 Cyg outburst

[Gordon Myers]

V2492 Cyg isn't in "outburst" but is back to its brightest at V= 15.1,
R=13.9 and I = 12.6.

Over 5 years of data can be seen at AAVSO -
https://www.aavso.org/lcg/plot?auid=000-BJW-353&starname=V2492+CYG&lastdays=
2300&start=&stop=2457446.1271196413&obscode=&obscode_symbol=4&obstotals=yes&
calendar=calendar&forcetics=&grid=on&r=on&iband=on&v=on&uWV0pt=on&pointsize=
1&width=800&height=450&mag1=&mag2=&mean=&vmean=

Gordon Myers

-----Original Message-----
From: vsnet-alert [mailto:vsnet-alert-bounces at ooruri.kusastro.kyoto-u.ac.jp]
On Behalf Of Ulisse Munari
Sent: Saturday, February 27, 2016 2:44 AM
To: Taichi Kato <tkato at kusastro.kyoto-u.ac.jp>; roger.pickard at sky.com;
stevejon at btinternet.com
Cc: vsnet-campaign-orion at ooruri.kusastro.kyoto-u.ac.jp;
vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp;
vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp;
vsnet-outburst at yahoogroups.com; variable_star_forum at yahoogroups.com;
vsnet-alert at yahoogroups.com
Subject: [vsnet-alert 19530] Re: V2492 Cyg outburst


This could probably be a false Gaia alert. The object is quite red (sort of
(V-I)~3) and Gaia is measuring in white light (Gaia G band), so any
comparison Gaia G versus literature V is prone to false results.

In addition, the historical lightcurve of this variable is characterized by
continuous and large variability over several times scale, from days to
years. It is at white light ~ 14 mag since last December.

Ulisse Munari


On Fri, 26 Feb 2016, Taichi Kato wrote:

> V2492 Cyg outburst
>
>   As you may be probably aware, this pre-main sequence star is 
> undergoing a major outburst.
> This object underwent an outburst in 2010 (likely an EX Lup-type 
> object).
>
> http://gsaweb.ast.cam.ac.uk/alerts/alertsindex
>
> Gaia16aft 	2016-02-22 16:44:28 	312.85930 	44.08995
14.08 			YSO 	2016-02-24 18:12:38 	Outburst >6mag of
V2492Cyg - known eruptive star
>
>