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You can also see this in the change of slope of the spectra - the increased scattering is much stronger in the blue. Chris Lloyd On Sat, 1 Mar 2003, Seiichi Yoshida wrote: > Dear colleagues, > > I heard Taichi Kato's comment that fading of a Herbig Ae/Be star is > due to the dusk cloud rotating around the star. > > John Greaves and I noticed that the color of MisV1147, a Herbig Ae/Be > variable star discovered by the MISAO Project, changes between when it > was almost constant and when it was fading frequently. > > Please see the following web page for information in details on > MisV1147. > > http://vsnet.aerith.net/misao/variable/MisV1147.html > > Here are the photometry by Arne A. Henden and Ondrej Pejcha. > > Date Observer V V-I Phase Note > --------------------------------------------------------------------- > 2002 Jan 14 Henden 13.365 1.186 bright almost constant > 2002 Oct 30 Henden 14.876 1.612 faint frequently fading > 2003 Jan 5 Pejcha 14.712 1.580 faint frequently fading > 2003 Jan 11 Pejcha 13.593 1.525 bright frequently fading > 2003 Feb 7 Pejcha 14.481 1.615 faint frequently fading > > Note that MisV1147 had been almost constant in early 2002, but it has > been frequently fading since 2002 summer. > > It was bluer in early 2002, when it has been almost constant. But > after it began to fade frequently, it became redder whenever it was > bright and faint. > > These results can be explained as follows: > > There was no dust around the MisV1147 in early 2002, so it was almost > constant. But the dust appeared in 2002 summer, which caused it > redder. Then MisV1147 began to fade frequently. > > Best regards, > > -- > Seiichi Yoshida > comet@aerith.net > http://vsnet.aerith.net/ >
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