[vsnet-alert 10140] CH UMa in outburst again?
denis at hea.iki.rssi.ru
Thu May 1 01:20:00 JST 2008
AAVSO observers report the brightening of CH UMa:
YYYYMMDD(UT) mag observer
20080427.248 <143 (Patrick Abbott)
20080430.068 130 (Glenn Chaple)
20080430.085 128 (John Bortle)
If the outburst is confirmed, this is only 116 days since the previous
one - exceptionally short interval compared to the average cycle of 370
days for this star. But CH UMa has been "misbehaving" during last two
years: there were 543 days between Nov. 2005 and May 2007 outbursts
followed by the unusual slow outburst in Jan. 2008. Looks like
something strange is going on with the accretion rate in this
(previously quite regular) system. Definitely worth monitoring!
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