[vsnet-alert 355] U Gem

[droussel-dupre@lanl.gov (Diane Roussel-Dupre)]

We have been oberving U Gem with ALEXIS since 0 UT 5 March. We are in a hot
time (100% sun lit orbit) which means that we usually turn off the
telescopes for the safety of the satellite, but are managing to limp along
observing with one telescope pair only without disasterous effects. We did
not get on source quickly enough to see the turn on; probably missed it by
0.5 days.

We have been comparing this outburst to the one we observed a year ago and
notice a major difference.

April '95 both the 130 and 186 A channels detected U Gem at about the same
count rate

March ' 96 only the 130 A channel is detecting U Gem.

Looking at the spectra in the EUVE paper ("EUVE Observations of U Gem",
Long, Mauche, Szkody, & Mattei, 1995), we note that there appears to be a
type of line feature at the 186 A band, which is consistent with our April,
'95 observation. Therefore, based upon the current data, we would conclude
that this line is missing at this time.

Because this looks to be a very unusual outburst from this system, we urge
continued groundbased observation. If possible, it might be instructive to
get groundbased spectra to compare with previous outbursts.

Diane Roussel-Dupre


------------------------------------------------------------------------------
Diane Roussel-Dupre, NIS-2
Los Alamos National Laboratory
Telephone: (505) 667-8895
FAX: (505) 665-4414

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