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4 papers · 1 filter
Hipparcos results on massive X-ray binaries
Claude Chevalier, Sergio A. Ilovaisky
We present results on parallaxes, magnitudes and proper motions for 17 optically identified massive X-ray binaries (MXRB) which were observed during the Hipparcos astrometry missio…
The Double Quasar Q2138-431: Lensing by a Dark Galaxy?
M. R. S. Hawkins, D. Clements, J. W. Fried +4
We report the discovery of a new gravitational lens candidate Q2138-431AB, comprising two quasar images at a redshift of 1.641 separated by 4.5 arcsecs. The spectra of the two imag…
Miscellaneous observations of active galactic nuclei. II
A. C. Goncalves, P. Veron, M. -P. Veron-Cetty
We observed 37 AGN candidates and classified them on the basis of their spectroscopic properties; three are confirmed QSOs, one is a BL Lac object, nine are Seyfert 1 galaxies, fou…
The ROSAT Bright Source RX~J0222.4+4729: an Active Nearby Short-period Binary of the BY Dra type
Claude Chevalier, Sergio A. Ilovaisky
We report the discovery of a new BY Dra-type binary identified as the optical counterpart of the bright source RX J0222.4+4729 detected during the ROSAT All-Sky Survey (Voges et al…