A deep, fuly sampled diffraction limited (FWHM ∼ 70 mas) narrow-band image of the central region in M87 was obtained with the Wide Filed and Planetary Camera 2 of the Hubble Space Telescope using the dithering technique. The Hα+[N ii] continuum subtracted image reveals a wealth of details in the gaseous disk structure described earlier by Ford et al. (1994). The disk morphology is dominated by ...

Precision radial velocity measurements of the γ Cephei (HR8974) binary system suggest the existence of a planetary companion with a minimum mass of 1.7 Jupiter-mass on an elliptical orbit with a ∼2.14 AU semimajor axis and 0.12 eccentricity [1]. I present in this paper a summary of the results of an extensive numerical study of the orbital stability of this three-body system for different value...

We present a phase-resolved spectroscopic study of the secondary star in the cat-aclysmic variable U Gem. We use our data to measure the radial velocity semi-amplitude, systemic velocity and rotational velocity of the secondary star. Combining this with literature data allows us to determine masses and radii for both the secondary star and white dwarf which are independent of any assumptions ab...

Binary radio pulsars are superb tools for mapping binary orbits, because of the precision of the pulse timing method (e.g Taylor & Weisberg 1989). To date, all orbital parameters for binary pulsars have been derived from observations of the pulsar alone. We present the rst observations of the radial velocity variations due to the binary motion of a companion to a radio pulsar. Our results demon...

We present results of non-simultaneous time resolved photometric and spectroscopic observations of little-studied dwarf nova FS Aur in quiescence. The spectrum of FS Aur shows strong and broad emission lines of hydrogen and He I, and of weaker He II λ4686 and C III/N III blend, similar to other quiescent dwarf novae. All emission lines are single-peaked, however their form varies with an orbita...

A deep, fuly sampled diffraction limited (FWHM ∼ 70 mas) narrowband image of the central region in M87 was obtained with the Wide Filed and Planetary Camera 2 of the Hubble Space Telescope using the dithering technique. The Hα+[N ii] continuum subtracted image reveals a wealth of details in the gaseous disk structure described earlier by Ford et al. (1994). The disk morphology is dominated by a...

We present red spectra in the region ∼ λ7000–8300Å of the eclipsing dwarf nova IP Peg, with simultaneous narrow-band photometry centered at 7322Å. We show that by placing a second star on the slit we can correct for the telluric absorption bands which have hitherto made the TiO features from the secondary star unusable. We use these TiO features to carry out a radial velocity study of the secon...

Accounting for stellar activity is a crucial component of the search for ever-smaller planets orbiting stars of all spectral types. We use Doppler imaging methods to demonstrate that starspot-induced radial velocity variability can be effectively reduced for moderately rotating, fully convective stars. Using starspot distributions extrapolated from sunspot observations, we adopt typical M dwarf...

J Bone Joint Surg [Br] 2008;90-B:133-9. Kienböck’s disease is a form of osteonecrosis affecting the lunate. Its aetiology remains unknown. Morphological variations, such as negative ulnar variance, high uncovering of the lunate, abnormal radial inclination and/or a trapezoidal shape of the lunate and the particular pattern of its vascularity may be predisposing factors. A history of trauma is c...

*Correspondence: Yong-Xiang Li, State Key Laboratory for Mineral Research Deposits, School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Avenue, Nanjing 210046, China e-mail: [email protected] Post-depositional compaction is an integral part of sedimentary rock formation and thus has been reasonably deemed as a major culprit for the long-recognized inclination-shallowing prob...