[vsnet-alert 15921] Re: KIC 11390659

Denis Denisenko d.v.denisenko at gmail.com
Fri Jul 5 21:37:00 JST 2013

Regarding KIC 11390659 = 1RXS J185831.1+491434 = GALEX J185830.9+491432.

This variable shows a really interesting behavior with no regular
pattern of outbursts. Kepler light curve from Quarters 6-7 shown at
Fig. 11 of the paper by Howell et al. (arXiv:1302.3975) *might* remind
that of ER UMa-type dwarf novae, while Quarters 9-11 and 14-15 are
looking rather different. Also, quoting the paper above:

> the periods are not well established but the common solution for all 3 lines
> from the blue channel in the Palomar data are in the range of 106-109 min

(from the analysis of Balmer line velocities on Page 9), however
caption to Fig. 11 says:

> A power spectrum of this light curve showed no significant periods including any near 107 minutes.

Well, but if you check short cadence from Quarter 14 and limit the
period range to 0.04-0.10, you will find a peak on the periodogram
that stands out at 0.076775d with power 90.0 (other peaks on the power
spectrum have values of 34.5, 31.2 and lower).

Thus, it is possible that the period is 110.56 minutes - formally
outside the suggested range of 106-109 min, but close to it.

Also, I have checked MASTER data for the last ~1.5 years, and the
object was never found brighter than 15.2 unfiltered magnitude. The
last observations by MASTER-Amur were obtained on June 28 UT:

KIC 11390659 = 1RXS J185831.1+491434
  20130628.686  160C  MASTER-Amur
  20130628.723  164C  MASTER-Amur

V=14.8 value reported by Kris Stanek in [vsnet-alert 15906] seems to
be unusual, indeed!

Denis Denisenko

On Fri, Jul 5, 2013 at 4:17 AM, Taichi Kato
<tkato at kusastro.kyoto-u.ac.jp> wrote:

>> KIC 11390659             284.62908      49.24234        6477     14.8
>    The ordinary magnitude is r=16.1 (Kepler Input Catalog).
> The Kepler data did not record strong outbursts.
> Coordinates:
> 18 58 30.914  +49 14 32.67

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