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7 papers · 2 filters
Comparison of the H-alpha circumstellar disks in Be/X-ray binaries and Be stars
R. K. Zamanov, P. Reig, J. Marti +4
We present a comparative study of the circumstellar disks in Be/X-ray binaries and isolated Be stars based upon the H-alpha emission line. From this comparison it follows that the…
Optical and X-ray monitoring of the NLS1 galaxy Ark 564
I. E. Papadakis, W. Brinkmann, H. Negoro +3
The Narrow-line Seyfert galaxy Ark 564 was monitored between June 04, 2000 and June 24, 2000 from Skinakas Observatory. The B,V,R and I band light curves show night to night variat…
The Be/X-ray binary LS 992/RX J0812.4-3114: physical parameters and long-term variability
P. Reig, I. Negueruela, D. A. H. Buckley +3
We present the first long-term optical and infrared study of the optical counterpart to the source RX J0812.4-3114, an X-ray pulsar with a Be type companion. During the period cove…
Deep Halpha imagery of the Eridanus shells
P. Boumis, C. Dickinson, J. Meaburn +5
A deep \ha image of interlocking filamentary arcs of nebulosity has been obtained with a wide-field ( 30\degree diameter) narrow-band filter camera combined with a CCD as…
Correlated V/R and IR photometric variations in the Be/X-ray binary LS I +61 235/RX J0146.9+6121
P. Reig, I. Negueruela, M. J. Coe +3
We report on the long-term variability of the Be/X-ray binary LS I +61 235/RX J0146.9+6121. New optical spectroscopic and infrared photometric observations confirm the presence of…
Dust properties of external galaxies; NGC 891 revisited
P. B. Alton, E. M. Xilouris, S. Bianchi +2
We compare 850um SCUBA images of NGC 891 with the corresponding V-band optical depth predicted from radiation transfer simulations. These two tracers of dust show a very similar di…