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14 papers · 2 filters
Detection of a high frequency break in the X-ray power spectrum of Ark 564
I. E. Papadakis, W. Brinkmann, H. Negoro +1
We present a power spectrum analysis of the long ASCA observation of Ark 564 in June/July 2001. The observed power spectrum covers a frequency range of ~ 3.5 decades. We detect a h…
The aperiodic variability of Cyg X-1 and GRS 1915 +105 at very low frequencies
P. Reig, I. Papadakis, N. D. Kylafis
We have carried out a timing analysis of Cyg X-1 and GRS 1915+105 using more than 5 years worth of data from the All Sky Monitor (ASM) on board RXTE. We have obtained for the first…
A CCD mosaic of an extended remnant in Cygnus
F. Mavromatakis, P. Boumis, E. V. Paleologou
We present the first CCD mosaic ever produced for the supernova remnant G 65.3+5.7 in [OII] 3727 at a moderate angular resolution. The remnant was observed with the 0.3 m wide-fiel…
Optical observations of the supernova remnant AX J2001+3235
F. Mavromatakis, P. Boumis, E. V. Paleologou
We present results from a first analysis of optical data on G 69.4+2.4 obtained with the 0.3 m and 1.3 m telescopes at Skinakas Observatory. Filamentary emission is detected in the…
Seeing Measurements at Skinakas Observatory using the DIMM method
P. Boumis, A. Steiakaki, F. Mavromatakis +2
We present preliminary results from a study of the seeing at Skinakas Observatory in Crete, Greece. The measurements have been made during the years 2000 and 2001 using a two-apert…
Photometric Variability of the Gravitational Lens 0142-100 (UM 673)
D. Sinachopoulos, Th. Nakos, P. Boumis +3
We present the results of a photometric CCD monitoring of the gravitational lens system UM 673, that took place from 1995 to 2000. In total, the doubly-imaged quasar was observed i…