[vsnet-alert 17308] Re: SDSS J140429.37+172359.5 outburst

[Denis Denisenko]

On Mon, May 19, 2014 at 8:24 AM, Taichi Kato
<tkato at kusastro.kyoto-u.ac.jp> wrote:
> SDSS J140429.37+172359.5 outburst

Checking MASTER database shows there was another outburst in January 2012:

SDSS J140429.37+172359.5 = RX J1404.4+1723
  20120126.742  14.15C  MASTER-Amur
  20120126.792  14.30C  MASTER-Amur
Internal photomerty errors are 0.06m.

> Although the outburst amplitude is small, the SDSS colors
> suggest a short orbital period.

Probably the SDSS record is a blend of the CV and the nearby white
dwarf. Look carefully at the SDSS entry for this star with a zoomed
image:

SDSS J140429.37+172359.4
u=17.11 g=17.49 r=17.36 i=17.38 z=17.26
http://skyserver.sdss3.org/dr8/en/tools/explore/obj.asp?id=1237668297141256216

I strongly suspect the fainter blue component to the north-east. If
the quiescent mag is 18-18.5, the outburst amplitude becomes more
usual for the dwarf novae.

> A bright X-ray source in the ROSAT catalog.

1RXS J140429.5+172352  flux=0.140+/-0.022 cnts/s HR1=0.40+/-0.15 HR2=0.38+/-0.18

Denis Denisenko
Member of MASTER team at SAI MSU