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All my recent data measures a star only once a night. So why not #3? With
three dual telescopes running, I get everything that transits the meridian
once a night in V and I.
These are simultaneous brightenings in V and I. Not necessarily the same
change in V and I.
These are .2 to 1 mag increases in a star measured many times
before. (Otherwise the WS would not pick it up.) Sometimes I see more than
one in the data I have for a star. In some cases it might be shifted by
0.001 degree. In others it matches the other measurements to 0.0002 degree
I have sort of assumed that these are caused by airplane trails or some
such. Cosmic rays cannot do it because of the simultaneous V and I
At 11:35 PM 5/18/03 +0930, Fraser Farrell wrote:
>Tom Droege wrote:
> > Are there many stars that flash? I keep finding stars with one bright
> > point.
>TASS Press Release : the Mark IV discovers gravitational lens events.... :-)
>Three of the four astronomical possibilities that come to mind can all be
> - Pulsars. Not bright enough (optically), and they would flash many many
>times during a single Mark IV exposure.
> - Gamma ray burst's optical counterpart. This might explain those
>"seen once and never again" stars.
> - Dwarf novae outbursts typically go on for hours, sometimes days. Lots of
>these potentially detectable by TASS. But if you're taking many images per
>night of a dwarf nova, you would see it "bright" on several consecutive
>The fourth possibility is red dwarfs that are Flare Stars. These are
>detectable as occasional outbursts of light & radio waves that last 10-30
>minutes. Proxima Centauri, for example, can brighten from its usual mag 11 up
>to mag 9 during a flare. Quite a sight if you're lucky enough to see one!
- From: Tom Droege <firstname.lastname@example.org>
- Re: Flashers
- From: Fraser Farrell <email@example.com>