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Re: R CrB deepest minimum > You can see from the BAAVSS plot and also from the AAVSO plot of > 1843-1972: > > http://vsnet.aavso.org/images/HISTRCRB.GIF > > that the typical RCB lightcurve hits bottom at ~8 mag below max. The > lightcurve actually shows a flat bottom that it can't go below. At this > point, we are seeing no direct light from the star and only scattered > light from around the star. Other RCB stars show similar behaviour. It would be also worth noting that the VSOLJ (Variable Star Observers League in Japan) has a light curve since 1906. http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/VSOLJ/LCs/index/CRBR.html (I don't know how the magnitude scale was determined in the past; there may have been a original chart). Looking at all the mentioned light curves, there seems to be little evidence that R CrB has ever gone much fainter than mag 14.0. The same limitation seems to be strictly kept during the most recent years, when a better-defined V-magnitude sequence becomes available. This is in good agreement with the current interpretation, as Dr. Clayton explained. My question is, therefore, where was the origin of the 14.8v mag in the literature. Was that real (we probably need a slightly modified interpretation if this was real), or rather doubtful? Regards, Taichi Kato
Return to the Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
