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14 papers · 2 filters
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…
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…
Spectroscopic observations of the candidate sgB[e]/X-ray binary CI Cam
R. I. Hynes, J. S. Clark, E. A. Barsukova +12
We present a compilation of spectroscopic observations of the sgB[e] star CI Cam. This includes data from before, during, and after its 1998 outburst. The object shows a rich emiss…
On the Nature of X-ray Variability in Ark 564
M. Gliozzi, W. Brinkmann, C. Raeth +3
We use data from a recent long ASCA observation of the Narrow Line Seyfert 1 Ark 564 to investigate in detail its timing properties. We show that a thorough analysis of the time se…