54 citations · 80 across the 5 of their papers we have counts for
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AGB and post-AGB stars
Dieter Engels
Intermediate mass stars (1-8 solar masses) evolve along the Asymptotic Giant Branch after completion of hydrogen and helium core burning. At the tip they lose for several ten to hu…
Stellar evolution and the 'O-rich AGB sequence'
F. M. Jimenez-Esteban, D. Engels, P. Garcia-Lario
The `O-rich AGB sequence' is a well defined area occupied by oxygen-rich AGB stars (OH/IR) in the IRAS two-colour diagram [12]-[25] vs [25]-[60]. This sequence is interpreted in te…
An infrared study of galactic OH/IR stars. I. An optical/near-IR atlas of the Arecibo sample
F. M. Jiménez-Esteban, L. Agudo-Mérida, D. Engels +1
In this paper we present optical and near-infrared finding charts, accurate astrometry (~1") and single-epoch near-infrared photometry for 371 IRAS sources, 96% of those included i…
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…
HS2237+8154: On the onset of mass transfer or entering the period gap?
B. T. Gaensicke, S. Araujo-Betancor, H. -J. Hagen +4
We report follow-up observations of a new white dwarf/red dwarf binary HS2237+8154, identified as a blue variable star from the Hamburg Quasar Survey. Ellipsoidal modulation observ…