[vsnet-chat 2080] Re: BV sequence for V1333 Aql

[aah@nofs.navy.mil]

Taichi Kato wrote:
>Aside from usual outbursts, there was a report (in ApJ letter, last year?)
>of recurrent short optical flashes.  I wonder whether this phenomenon has
>been confirmed, and whether is accesible to eyes.
  I think the article you are referring to is E. L. Robinson and P. Young,
"Giant, Repeating, Optical Bursts from the Soft X-Ray Transient Aquila X-1",
Ap. J. 491, L89-91, 1997.  They used the McDonald 2.1-m telescope
(+CCD, 1min time resolution) in 1995 and 1997, and measured at least
nine pseudo-periodic bursts with amplitudes between 0.17 and
0.35mag, with burst lengths as short as 10 minutes.  They do not have great
resolution on the bursts, with 1-3 data points each.  I noticed flickering
of this scale on SS Cyg while I was monitoring it last month (but with a
much poorer 6min time resolution).  High-speed monitoring of such systems
is difficult unless you have a large enough telescope to get good signal/noise
for short exposures, but it would be fun.  We did some high-speed stuff on
a DQ Her star at the MMT and it was amazing the amount of detail you can
resolve if you have enough photons.
Arne

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