[vsnet-newvar 3630] Re: [vsnet-alert 14824] PNV_J180645.2-360458

[Terry Bohlsen]

Dear Hiroyuki
I took a spectra of this star last night (4Aug2012) with a LISA spectrograph 
on a 200mm scope. It does not look like a nova.
It is reddened and has a faint Ha absorption line. There is  strong Ca 
absorption at 5892 that is blended in my low res spectra R=700. There is a 
strong absorption line at the Mg I triplet around 5170.
There is a strong broad absorption line at Hb with some overlying features I 
can't identify.
It has the broad profile of a K3 star but with greater Hb absorption.
Images are here.
http://i566.photobucket.com/albums/ss109/TCB168/_pnvj1806452-360458_20120804_448.png

http://i566.photobucket.com/albums/ss109/TCB168/dual.png

Cheers

Terry Bohlsen

----- Original Message ----- 
From: "Hiroyuki Maehara" <maehara at kwasan.kyoto-u.ac.jp>
To: <vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp>; 
<vsnet-newvar at ooruri.kusastro.kyoto-u.ac.jp>
Sent: Saturday, August 04, 2012 12:24 PM
Subject: [vsnet-alert 14824] PNV_J180645.2-360458


> Shigehisa Fujikawa (Kagawa, Japan) reported his discovery of an unusual
> variable star (or possible nova?) in Sgr. His observations and a follow-up
> observation by K. Itagaki (Yamagata, Japan) are as follows (measured by
> H. Kaneda, Hokkaido, Japan):
>
> 2012 Jul 23.517     12.5  (S. Fujikawa; f=105mm lens + CCD)
>         23.519     12.6  (S. Fujikawa; f=105mm lens + CCD)
>         30.554     12.2  (S. Fujikawa; f=105mm lens + CCD)
>         30.555     12.0  (S. Fujikawa; f=105mm lens + CCD)
>     Aug  1.553     11.5  (S. Fujikawa; f=105mm lens + CCD)
>          1.605     11.3  (S. Fujikawa; f=400mm lens + Canon EOS X2 DSLR 
> camera)
>          2.467     11.3  (K. Itagaki; 60cm telescope + CCD)
>          2.491     11.5  (S. Fujikawa; f=400mm lens + Canon EOS X2 DSLR 
> camera)
>
> The object is located at R.A. =  18h 06m 45.23s, Decl. = -36d 04' 58.5"
> (equinox 2000.0; measured from 6 CCD images obtained by K. Itagaki with
> 60cm telescope). There is a faint object in the 2MASS catalog
> (2MASS J18064523-3604583 Jmag=15.11) at this position.
>
> H. Kaneda pointed that this object was detected by ASAS. According to
> ASAS data, this object brightened slowly during 2003-2005 and it was
> at almost constant brightness (V~12mag) during 2005-2008. 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
> 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 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.
>
> 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