[vsnet-alert 11710] V406 Hya outburst and SDSS J012940.05+384210.4

Taichi Kato tkato at kusastro.kyoto-u.ac.jp
Sun Dec 6 13:36:45 JST 2009

   According to ATEL, V406 Hya (= SN2003aw) is also in outburst.
This object also showed multiple rebrightenings similar to those of EG Cnc
during the 2004 superoutburst:

   The detection of SDSS J012940.05+384210.4 on Dec. 3 clearly spotted
the rising stage of the "rebrightening" detected by Maehara-san.


The Astronomer's Telegram                   http://www.astronomerstelegram.org 
ATEL #2334							     ATEL #2334

Title:		Two AM CVn systems in outburst - V406 Hya and SDSS J0129+3842
Author:	T. Barclay (Armagh Observatory/MSSL-UCL), G. Ramsay (Armagh
		Observatory), D. Steeghs (Warwick), P. Wheatley (Warwick), S. Rosen
Queries:	tsb at arm.ac.uk
Posted:	5 Dec 2009;  17:26  UT
Subjects:	Request for Observations, Binaries, Cataclysmic Variables,
		Novae, Variables

We are conducting a campaign of monitoring AM CVn systems visible from
the Northern Hemisphere once a week using the Liverpool Telescope on La
Palma.      On the night of 3/4 December 2009 we observed two of the AM
CVn systems to be in a state of outburst, V406 Hya (RA=09:05:54.79, Dec=-05:36:08.6)
and SDSS J0129+3842 (RA=01:29:40.06, Dec=+38:42:10.4). V406 Hya (also known
as 2003aw) has a typical quiescent brightness of g~20.2. At 02:21UT we
observed this system at a g magnitude of 14.80+-0.02.      We observed
SDSS J0129+3842 to be at g=16.81+-0.02 at 22:58UT, 3.2 mag. brighter than
the typical quiescent brightness of g~20.05+-0.05. We observed this system
again a day later at 22:28UT on 4 December 2009 at a brightness of g=15.13+-0.02.
Both these outbursts are above ~5 magnitudes and are among the highest
amplitude outbursts observed in AM CVn systems. Our observations are continuing
and we encourage further observations. 

Password Certification:  Gavin Ramsay (gar at arm.ac.uk)

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