[vsnet-alert 15604] Next HST observations: HS1055+0939 = IU Leo

Boris Gaensicke Boris.Gaensicke at warwick.ac.uk
Sat Apr 13 02:50:34 JST 2013

Dear All,

thanks for all your help with the latest three observations, all went well:

* IY UMa: the HST spectrum shows the white dwarf seen through
a thin veil of material sitting ontop of the accretion disk, similar to
OY Car (http://adsabs.harvard.edu/abs/1994ApJ...426..294H), very

* MR UMa and RZ Leo provided text-book spectra of their accreting
white dwarfs, exactly what the main aim of this HST project is about.

Onto the next one: HS1055_0939 = IU Leo. This is the longest
period CV in our program, with P=9h - detecting the white dwarf
in this system would be fantastic. It has relatively infrequent outbursts ,
the last one just about finished. Please keep it on your watch
list until the scheduled HST observations,

Apr 18, 2013 09:30:11 to Apr 18, 2013 12:05:05

Best wishes,


For more information on this HST program, see


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