[vsnet-alert 14826] Re: PNV_J180645.2-360458

[Sebastián Otero]

Subject: [vsnet-alert 14824] PNV_J180645.2-360458


> The object
> showed short fadings (time-scale of a few tens of days) in the 2009
> observing season.
> http://www.astrouw.edu.pl/cgi-asas/asas_variable/180645-3604.9,asas3,0,0,500,0,0


Impressive. Weird that it didn't make it to the ASAS catalogue. The onset of 
large amplitude variability at the most recent ASAS epochs is also 
intriguing. Maybe UXor-like and with an initial FUor-like initial eruption?


> Note: there is a mag~13-14 star at 18:06:45.67, -36:04:55.1 (J2000.0),
> about 6 arcseconds NE of this object.

The V-mag. of this object is around 14.4 and it is rather red (J-K= 1.14).


> The long-term variation of the object is similar to those of V4334 Sgr
> and FG Sge (or very slow nova?). Could someone perform spectroscopy of
> the object? This object was at Vmag=11.2 (B-V=1.1) on Aug. 3.50.

The UCAC3 magnitude indicates a mag. around 17 in V so this object has 
indeed a very large amplitude.


> object                   YYYYMMDD(UT)   mag      code
> PNV_J180645.2-360458     20120803.49784 9.87Ic   Mhh.VSOLJ
> PNV_J180645.2-360458     20120803.49878 10.54Rc  Mhh.VSOLJ
> PNV_J180645.2-360458     20120803.50007 11.22V   Mhh.VSOLJ
> PNV_J180645.2-360458     20120803.50229 12.33B   Mhh.VSOLJ
> PNV_J180645.2-360458     20120803.50539 11.23y   Mhh.VSOLJ


Do these magnitudes include the 14.4 mag. companion?
At this bright maximum the influence in V wouldn't be apparent (only 0.06 
mag.) but the colors could be screwed up.

Cheers,
Sebastian

-------------------------
Sebastian Otero
VSX Team
American Association of Variable Star Observers