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28 papers · 1 filter
Aperiodic variability of low-mass X-ray binaries at very low frequencies
P. Reig, I. Papadakis, N. D. Kylafis
We have obtained discrete Fourier power spectra of a sample of persistent low-mass neutron-star X-ray binaries using long-term light curves from the All Sky Monitor on board the Ro…
Multi-band optical micro-variability observations of BL Lacertae
I. E. Papadakis, P. Boumis, V. Samaritakis +1
We have observed BL Lacertae in the B, R and I bands for 2 nights in July, 1999, and 3 nights in July, 2001. The observations resulted in almost evenly sampled light curves, with a…
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…
Refraction at Media with Negative Refractive Index
S. Foteinopoulou, E. N. Economou, C. M. Soukoulis
We show that an electromagnetic (EM) wave undergoes negative refraction at the interface between a positive and negative refractive index material. Finite difference time domain (F…
1ES 1927+654: Persistent and rapid X-ray variability in an AGN with low intrinsic neutral X-ray absorption and narrow optical emission lines
Th. Boller, W. Voges, M. Dennefeld +7
We present X-ray and optical observations of the X-ray bright AGN 1ES 1927+654. The X-ray observations obtained with ROSAT and Chandra reveal persistent, rapid and large scale vari…
D-branes and the Standard Model
I. Antoniadis, E. Kiritsis, J. Rizos +1
We perform a systematic study of the Standard Model embedding in a D-brane configuration of type I string theory at the TeV scale. We end up with an attractive model and we study s…