[vsnet-alert 16586] Re: Possible fading of AB Aur

[Shawn Dvorak]

I've recorded a similar drop over the last 10 days or so:

20131011.44430  7.087B  0.004
20131012.44049  6.943V  0.004
20131012.44140  7.122B  0.018
20131018.45209  6.949V  0.005
20131018.45299  7.066B  0.008
20131019.42599  6.971V  0.006
20131019.42689  7.098B  0.003
20131026.31359  6.986V  0.009
20131026.31469  7.110B  0.008
20131027.42700  7.047V  0.007
20131027.42790  7.196B  0.008
20131029.45340  7.052V  0.003
20131029.45439  7.201B  0.003
20131030.45000  7.105V  0.020
20131031.45150  7.169V  0.006
20131031.45249  7.364B  0.003


(AAVSO light curve of the last 75 days: http://tinyurl.com/o6oajyg)

Shawn Dvorak


On 10/31/2013 11:01 PM, Hiroyuki Maehara wrote:
> The most recent observations by KWS show that the Herbig Ae/Be star
> AB Aur is fainter than usual. Confirmatory observations are requested.
>
> http://kws.cetus-net.org/~maehara/VSdata.py?object=AB+Aur&p_band=&plot=1&recent=1&submit=Send+query
>
> object   date(UT)       mag.    code  err.
> AURAB    20130928.80067 6.849Ic KW2   0.013
> AURAB    20130928.80067 7.027V  KW2   0.008
> AURAB    20130928.80104 7.061V  KW2   0.008
> AURAB    20130928.80105 6.835Ic KW2   0.012
> AURAB    20131012.74453 6.792Ic KW2   0.009
> AURAB    20131012.74454 7.061V  KW2   0.007
> AURAB    20131012.74490 6.768Ic KW2   0.009
> AURAB    20131012.74491 7.034V  KW2   0.007
> AURAB    20131027.72575 6.839Ic KW2   0.009
> AURAB    20131027.72575 7.129V  KW2   0.008
> AURAB    20131027.72612 6.841Ic KW2   0.009
> AURAB    20131027.72612 7.165V  KW2   0.008
> AURAB    20131031.73112 7.018Ic KW2   0.010
> AURAB    20131031.73112 7.293V  KW2   0.008
> AURAB    20131031.73148 7.001Ic KW2   0.011
> AURAB    20131031.73148 7.271V  KW2   0.008
>
> KW2: Kiso Wide-field Survey
>       f=105mm lens (F/2.0) + SBIG ST-8XME (V-band)
>       f=105mm lens (F/2.8) + SBIG ST-8XME (Ic-band)
>