25 citations · 50 across the 10 of their papers we have counts for
11 papers · 1 filter
New Planetary Nebulae in the Galactic Bulge region with l>0deg - II
P. Boumis, S. Akras, E. M. Xilouris +4
The presentation of new results from an [O III] 5007 A survey in a search for planetary nebulae (PNe) in the galactic bulge is continued. A total of 60 objects, including 19 new PN…
Multi-band optical micro-variability observations of the BL Lac object S4 0954+658
I. E. Papadakis, V. Samaritakis, P. Boumis +1
We have observed S4 0954+658 in the BVRI bands in 2001, and in the BI bands in 2002. The observations resulted in almost evenly sampled light curves, 3-8 hours long, with an averag…
Spectra and time variability of galactic black-hole X-ray sources in the low/hard state
D. Giannios, N. D. Kylafis, D. Psaltis
we propose a jet model for the low/hard state of black-hole X-ray sources which explains a) the X-ray spectra, b) the timelag spectra, c) the increase in the amplitude (QPO and hig…
Modelling the spectral energy distribution of galaxies. III. Attenuation of stellar light in spiral galaxies
Richard. J. Tuffs, Cristina C. Popescu, Heinrich J. Voelk +2
We present new calculations of the attenuation of stellar light from spiral galaxies using geometries for stars and dust which can reproduce the entire spectral energy distribution…
Spectra of Poynting-flux powered GRB outflows
D. Giannios, H. C. Spruit
We investigate the production of the gamma-ray spectrum of a Poynting-flux dominated GRB ouflow. The very high magnetic field strengths (super-equipartition) in such a flow lead to…
New Planetary Nebulae in the Galactic Bulge region with l>0deg - I. Discovery method and first results
Panayotis Boumis, Euthimios V. Paleologou, Fotis Mavromatakis +1
We present the first results of an [O III] 5007 A interference filter survey for Planetary Nebulae (PNe) in the Galactic bulge. Covering (at first) the 66 per cent of the survey ar…