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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/
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
