(cba:news) Outburst of ASAS 002511+1217.2 = RX J0025.1+1217 (fwd)

[Joe Patterson]

As some of you have noted, this is really quite a bright dwarf nova, about
10.5 - very surprising that this has eluded discovery until now!  Seems
likely the outbursts are quite rare, and that makes it our boy!  All the
more so since the star transits at local midnight and is available to all
northerners and intrepid southerners.  Great target - let's start a
vigorous campaign!

joe



---------- Forwarded message ----------
Date: Wed, 15 Sep 2004 17:55:31 +0200
From: Grzegorz Pojmanski <gp at astrouw.edu.pl>
To: vsnet-alert at kusastro.kyoto-u.ac.jp
Subject: [vsnet-alert 8295] Outburst of ASAS 002511+1217.2 = RX J0025.1+1217

Outburst of ASAS 002511+1217.2 = RX J0025.1+1217

ASAS-3 Alert System has detected outburst of possible dwarf nova:

ASAS 002511+1217.2 (00 25 11 +12 17 12, Eqnx 2000),

which is close (within one pixel) to the
RX J0025.1+1217 X-ray source (00 25 10.9 +12 17 25 Eqnx 2000)
and UNSO B1 objects:
USNOB_1022-0004645 (00:25:11.14 +12:17:12.3) B1=20.73 B2=16.64 R2=16.98 I2=17.24
USNOB_1022-0004646 (00:25:11.33 +12:17:14.3) B1=17.42 R1=16.46

Observations: 		V
HJD (2450000+)   AP_0   AP_1

3254.86329 	(invisible)
3259.70301 	12.463 10.487
3263.79241 	11.074 11.076
3263.79528 	11.115 11.101

Please note, that observation on 3254.86329 is 12.463 in aperture
AP_0 (2 pixels) and 10.487 10.482 10.462 10.446 in 3,4,5 and 6 pixels
diameter apertures. I cannot yet figure out why it is so, but
taking into account that larger apertures show consistently 10.4-10.5
the star may have already passed its maximum.
Graphical light curves on WWW pages automatically show however
AP_0 magnitudes  for 3259.70301 and AP_1 magnitudes for 3263.79241
and 3263.79528, suggesting that star may still be rising.

There are no previous ASAS observations at this position

Light curve and images can be found on
http://www.astrouw.edu.pl/cgi-asas/asas_disc/002511+1217.2,3254
or on ASAS Alert pages:
http://www.astrouw.edu.pl/~gp/asas/asas.html -> Alert Service Page -> New alerts