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From: "JG" Subject: mira flarings, vanadium stars, monitoring viewpoints, archival lookups, (non)selection effects > A way around some of these problems would be to check individual > datasets from long time observers to see if any such brighter than > usual observations occur. Since 1998 I couldn't document any of these events in my visual lightcurves of mira stars. This doesn't mean they don't exist, of course, but... > I do remember Vello > Tabur's home page carries a single example for R Cen, where he states > that he kept a bright outlier observation produced by his survey > system as he found independent confirmation of the event in visual > archives, noting that normally such a visual observation would be > discounted as a 'glitch'! > Currently, Vello Tabur's comments at the bottom of > http://vsnet.tip.net.au/~vello/varstar2/notes.htm > are the best simple non-circumstantial recent evidence out there, and > as this occured during a "secondary" maximum in this non-standard > Mira lightcurve, it is not necessarily extendable to all Mira stars.. I didn't observe any flare activity. Vello Tabur informed of flare activity around 2452330 and said it was consistent with AAVSO observations. However, AAVSO "bright" obervations are 4 and were made on JD 2452335.6, 2452336.6, 2452338.6 and 2452339.6 and THERE ARE observations by other AAVSO observers made siimultaneously that don't show signs of a brightening. I think that's why AAVSO staff didn't flagg those observations as valid. (So those observations were discounted as a 'glitch' after all!!) There are observations between 7.8 and 8.1 on JD 2452336.9, 2452337.4, 2452339.6 and 2452339.9 showing no activity. Furthermore, the "bright" magnitudes seem to belong to the same observer..... while the other four observations are for a different observer each. So it's better not to jump to conclussions. My observations around that time are: 20020224.235 12329.735 7.43 20020302.289 12335.789 7.44 20020306.099 12339.599 7.44 20020315.157 12348.657 7.46 Very stable...... I have uploaded a lightcurve including ASAS-3 data. (go to the bottom of the page for the flaring thing) http://ar.geocities.com/varsao/Curva_R_Cen.htm Unfortunately, there are no observations for that period of time. Regards, Sebastian.
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