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From: "Efimov Yu.S." <efimov@crao.crimea.ua> Subject: Re: [vsnet-campaign-rcb 95] Re: [AAVSO-DIS] R CrB Date: Mon, 17 Feb 2003 22:06:56 +0200 Dear Prof Kato-san, I studied the R CrB polarization and photometric variations during several deep minima and support your opinion that it is very important to monitor by high frequency program the light and color variations of this star as well as all of other stars with that phenomenon. The color variations in as much bands as possible from far ultraviolet to far infrared in the course of the minimum depend on changing of optical charactreristics of dust particles in the process of their growth during formation of dusty clouds around a star and may be used to improve our knowledge about the dust material and its location. Regards, Yuri Efimov, Crimean astrophysical observatory, Ukraine ----- Original Message ----- > Re: [AAVSO-DIS] R CrB > > > I would not recommend to observe R CrB every half an hour while it is fading, > > to avoid biases. And in my opnion completely redundant : this star is so > > widely observed ! > > In some "dust fading" objects, short-term variations (less than 1 hour) > are suspected. Some of these variations are considered to reflect transient > dust formation and destruction(?) [I read this in some recent book, but > don't have a bibliographic reference]. It is not yet obvious whether > oversampled observations are useless. > > Regards, > Taichi Kato >
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