[vsnet-rcb 864] Re: [VSS] V0854 CEN fading? and S Aps possible fade - vsnet-rcb - ooruri.kusastro.kyoto-u.ac.jp

30 Jul 2022


      Hi Marcos and All,
As noted below, the RCB star V854 Cen may have commenced to decline (10x50mm binoculars):
CENV854              20220717.386     74           WPX
CENV854              20220724.420     73           WPX
CENV854              20220727.410     74           WPX
CENV854              20220728.432     75           WPX
CENV854              20220730.368     81           WPX
Also, the RCB star S Aps is also fainter than usual tonight and may have commenced to decline (20x80mm binoculars):
APSS      20220717.418     95           WPX
APSS      20220724.465     97           WPX
APSS      20220727.454     97           WPX
APSS      20220728.403     96           WPX
APSS      20220730.429     100         WPX
Further observations will confirm if either or both of these stars continue into a deep decline.
Tks and regards
Peter Williams
Heathcote NSW
From: 'Peter Williams' via Variable Stars South [mailto:VariableStarsSouth@googlegroups.com] 
Sent: Saturday, 30 July 2022 5:37 PM
To: VariableStarsSouth@googlegroups.com
Subject: RE: [VSS] V0854 CEN fading?
Hi Marcos,
V854 Cen is perhaps the most active of the RCB stars and would seem ready for a deep decline, if not overdue.  I have noticed its SR variations having a marginally greater amplitude during June and July and that has in previous cases led to a decline onset.   My most recent observation was on Thursday, July 28.432UT at magnitude 7.5.  That is marginally fainter than usual and with your most recent  magnitude of 7.9, it may well indicate the onset of a decline.
It will sometimes stall near magnitude 8 and return to maximum but if it goes below magnitude 8.5 then a deep decline is most likely underway.
Hopefully the twilight clouds will clear tonight!
Tks and regards
Peter Williams
From: variablestarssouth@googlegroups.com mailto:variablestarssouth@googlegroups.com  [mailto:variablestarssouth@googlegroups.com] On Behalf Of Marcos Silva
Sent: Saturday, 30 July 2022 8:03 AM
To: Variable Stars South <VariableStarsSouth@googlegroups.com mailto:VariableStarsSouth@googlegroups.com >
Subject: [VSS] V0854 CEN fading?
Dear VSS friends, last night i observed the RCB star V0854 Cen fainter than the comparison star of mag 7.5. I have observed it here again now and estimated the magnitude of 7.9, we have some cirrus here at the moment, so the star could be a little bit brighter (7.8 or 7.7). But it is still fainter than 7.5 and brighter than 8.2.
I'm warning you because this could be the beginning of a fading of the star.
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