[vsnet-j 102] NSV 14652

[Taichi Kato <tkato>]

NSV 14652

　ROSATと同定されたNSV天体ですが、アウトバーストらしき増光が報告されて
　います。過去に 12-13等まで明るくなっている写真があるそうで、今回の増光
　がどこまで明るくなるか、また天体の正体とともにたいへん注目されます。
　今晩観測可能な方はぜひ向けてみてください。

Date: Tue, 22 Aug 2000 23:09:17 -0000
Subject: [vsnet-alert 5202] Rare outburst of NSV 14652

Dear colleagues,

I have just detected a (faint) outburst of NSV 14652, a suspected CV =
(UG?) on which very few information seems to be available, using the =
0.35-m f/6.3 telescope and ST-7 CCD (unfiltered) of CBA Belgium =
Observatory. The object is located at R.A. =3D 23h38m49.2s, Decl =3D =
+28d19'55" (J2000.0). The NSV lists a magnitude range of 13.8 - 16.0 =
(photographic).

I know that Timo Kinnunen once mentioned the object in a VSNET email, =
indicating that it was bright on 3 out of 11 POSS scans, with a maximum =
brightness around mag 12.

More details on my observations :

200008XX.XXX UT, <17.0 C
20000822.882 UT,  15.8 C

We have initiated a time-series photometry session on NSV 14652, upon =
its outburst detection. A quick inspection of the current stage of the =
light curve isn't yielding large amplitude modulations (yet).

Please continue monitoring this variable, as so little seems to be known =
about its nature.

Best regards,
Tonny Vanmunster
CBA Belgium Observatory

From: Taichi Kato <tkato>
Subject: [vsnet-alert 5204] NSV 14652: new campaign target

NSV 14652: new campaign target

    As reported by Tonny Vaunmunster, the suspected UG star NSV 14652
is in outburst.  The object has been selected as a possible noteworthy
object (possible CV candidate) since the possible identification
with a ROSAT source.

Date: Sat, 1 Jul 2000 21:47:36 +0900 (JST)
From: Taichi Kato <tkato>
Subject: [vsnet-chat 3314] NSV14652

NSV14652

   Another possible ROSAT identification.

   NSV14652:

233849.1 +281955 (2000.0) NSV14652 ? 13.8 16.0 P -

   ROSAT:

233847.7 +282010 (2000.0) 1RXS-F_J233847.8+282011 0.025 0.90 0.93

    The ROSAT hardness ratio seems to be a little hard for a dwarf nova,
but the low count rate has made discrimation difficult.

    Timo Kinnunen surveyed past photographic plates and indeed found
brightening which can be regarded as outbursts!

    Follow-up observations, including astrometry, multicolor photometry
and spectroscopy, of the present outburst are strongly encouraged.
The object is selected as a target-of-opportunity program of the VSNET
campaign.

Regards,
Taichi Kato
VSNET Collaboration team

From: Patrick Schmeer <p.schmeer@mx.uni-saarland.de>
Subject: [vsnet-alert 5205] Re: Rare outburst of NSV 14652  (correction)

On Tue, Aug 22, 2000 at 11:15:12PM -0000, Tonny Vanmunster wrote:
> Dear colleagues,
>  
> I have just detected a (faint) outburst of NSV 14652, a suspected CV (UG?)
on which very few information seems to be available, using the 0.35-m f/6.3
telescope and ST-7 CCD (unfiltered) of CBA Belgium Observato. The object
is located at R.A. = 23h38m49.2s, Decl = +28d19'55" (J2000.0). The NSV lists
a magnitude range of 13.8 - 16.0 (photographic).
> 
> I know that Timo Kinnunen once mentioned the object in a VSNET email,
indicating that it was bright on 3 out of 11 POSS scans, with a maximum
brightness around mag 12.
 
My inspection of the same scans revealed a brightening for a few days in 1993
June, when NSV 14652 had become almost as bright as the nearby mag 13.1 GSC
star. Unfortunately neither the rise nor the fading is covered by the POSS
scans, so it cannot be stated for sure whether that brightening was actually
an outburst.
 
>  
> More details on my observations :
> 
> 20000809.066 UT, <17.0 C
> 20000822.882 UT,  15.8 C
 
A rise by (at least) 1.2 magnitudes in 14 days does not necessarily imply an
outburst. During the 14-day interval NSV 14652 was checked by (at least) two
visual observers, but at mag 16 the variable would have been probably too   
faint for Timo and certainly too faint for myself.

Regards,
Patrick

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