2 citations · 2 across the 4 of their papers we have counts for
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The mysterious nature of HS2331+3905
S. Araujo-Betancor, B. T. Gaensicke, H. -J. Hagen +5
We report the discovery of one unique cataclysmic variable drawn from the Hamburg Quasar Survey, HS2331+3905. Follow-up observations obtained over three years unveiled a very unusu…
The Hamburg/RASS optical identification project
F. -J. Zickgraf, D. Engels, H. -J. Hagen +1
We use digitized Schmidt direct and prism plates taken for the northern hemisphere Hamburg Quasar Survey (HQS) to obtain optical identifications for all high galactic latitude X-ra…
The QSO evolution derived from the HBQS and other complete QSO surveys
Fabio La Franca, Stefano Cristiani
An ESO Key programme dedicated to an Homogeneous Bright QSO Survey (HBQS) has been completed. 327 QSOs (Mb<-23, 0.3<z<2.2) have been selected over 555 deg^2 with 15<B<18.75. For B<…