[vsnet-alert 14344] Re: possible unexpected color change of MisV0814

[Seiichi Yoshida]

Dear colleagues,

Unfortunately, MisV0814's color has returned to the original value
by Tsutomu Fujiwara's observations today.

* MisV0814

  Date and Time    Mag(Rc) Mag(V)  V-Rc
  --------------------------------------
  2012 Mar. 20.52  13.45   13.91   +0.46

* GSC 2412-00599 (for comparison)

  Date and Time    Mag(Rc) Mag(V)  V-Rc
  --------------------------------------
  2012 Mar. 20.52  13.30   13.68   +0.38

Best regards,

> Dear colleagues,
> 
> We detected a possible unexpected color change of our new variable
> star MisV0814, R.A. 05h33m33s.81, Decl. +34o43'23".7 (2000.0), in the
> course of the MISAO Project.
> 
> The V-Rc color of MisV0814 from Tsutomu Fujiwara's images are as
> follows. The color is changing rapidly in March.
> 
>   Date and Time    Mag(Rc) Mag(V)  V-Rc
>   --------------------------------------
>   2012 Jan. 11.52  13.62   13.94   +0.32
>   2012 Jan. 12.55  13.63   14.03   +0.40
>   2012 Jan. 17.56  13.64
>   2012 Jan. 23.56  13.60
>   2012 Jan. 28.51  13.47
>   2012 Jan. 31.54  13.57   13.97   +0.40
>   2012 Feb. 11.52  13.57
>   2012 Feb. 17.55  13.58
>   2012 Mar. 10.52  13.60   13.88   +0.28
>   2012 Mar. 12.51  13.57   13.79   +0.22
>   2012 Mar. 14.53  13.64   13.69   +0.05
>   2012 Mar. 19.53  13.59   13.57   -0.02
> 
> For comparison, the V-Rc color of a nearby 14-mag star GSC 2412-00599,
> R.A. 05h33m38s.48, Decl. +34o42'22".0, from the same images are as
> follows:
> 
>   Date and Time    Mag(Rc) Mag(V)  V-Rc
>   --------------------------------------
>   2012 Jan. 11.52  13.34   13.80   +0.46
>   2012 Jan. 12.55  13.26   13.73   +0.47
>   2012 Jan. 17.56  13.15
>   2012 Jan. 23.56  13.27
>   2012 Jan. 28.51  13.26
>   2012 Jan. 31.54  13.27   13.89   +0.62
>   2012 Feb. 11.52  13.40
>   2012 Feb. 17.55  13.28
>   2012 Mar. 10.52  13.20   13.80   +0.60
>   2012 Mar. 12.51  13.22   13.83   +0.61
>   2012 Mar. 14.53  13.33   13.91   +0.58
>   2012 Mar. 19.53  13.33   13.85   +0.52
> 
> The comparison star GSC 2412-00599 shows a constant brightness and
> color. But MisV0814 implies the change of color, with brightening only
> in V-band images.
> 
> We are glad if someone confirms the color of this star independently.
> 
> The web page of this star:
>   http://www.aerith.net/misao/data/misv.cgi?814
> 
> Best regards,
> 
> --
> Seiichi Yoshida
> comet at aerith.net
> http://www.aerith.net/

--
Seiichi Yoshida
comet at aerith.net
http://www.aerith.net/