[vsnet-alert 16449] ASASSN-13db

[Denis Denisenko]

On Tue, Sep 24, 2013 at 6:50 PM, Krzysztof (Kris) Stanek
<kstanek at astronomy.ohio-state.edu> wrote:

> ASASSN-13db         05:10:11.08   -03:28:26.3    2013-09-24.5     15.27
>
> ASASSN-13db: long outburst in a red star (!) with one previous outburst seen
> in CRTS data; current outburst started 2013/09/14, and nothing was detected
> 2013/09/08;

Interesting case! Obviously the *blue* star goes into outbursts which
is 4" North of the red star. See the color-combined finder chart:
http://master.sai.msu.ru/static/OT/J051011-032826-BRIR5x5.jpg

Several dwarf novae were found in wider double stars which are not
resolved in short-focus surveys, for example NSV 1485 = NN Cam = NSVS
519054 (7" separation) and DDE 8 = 1RXS J231935.0+364705 = NSVS
9022680 (with a neighbour at 18").

This pair of stars may be physically related to each other,
constituing a hierarchical triple system (1 WD + 2 RD's). Another
target for future high-precision astrometric missions to determine the
parallax, orbital parameters and mass ratio. Congratulations to
ASAS-SN team!

Denis Denisenko