Contents

• Contents
• 1. Review of major events
• 2. Research highlights
  • 1. The solar system
    • 1. The outer solar system
    • 2. Asteroids
  • 2. Stars and circumstellar matter
    • 1. Wolf-Rayet stars
    • 2. S Dor variables
    • 3. Final, or late He-flash objects
    • 4. Type IIn supernovae: evidence of circumstellar interaction
    • 5. Young stellar groups and OB associations
    • 6. $\boldsymbol{\omega}$ Centauri
    • 7. Dust particles in stellar winds
  • 3. Interstellar matter
    • 1. The properties of the small-scale structure in the polarized component of the galactic radio background
  • 4. The Galaxy
    • 1. The stellar halo
    • 2. Gravitational lensing
  • 5. Nearby galaxies
    • 1. Carbon in the N159/N160 complex of the Large Magellanic Cloud
    • 2. Dynamics of dwarf galaxies
    • 3. The Local Group dwarf galaxy LGS 3
    • 4. Dwarf elliptical galaxy snapshot survey
    • 5. Dynamical modeling of elliptical galaxies
    • 6. Nearby early galaxies sample survey
    • 7. Star Clusters in the Antennae galaxies
    • 8. Molecular hydrogen emission in the ultraluminous merger NGC6240
  • 6. Active galaxies and distant galaxies
    • 1. Nearby radio-loud galaxies
    • 2. Giant and double-double radio sources
    • 3. Seyfert and starburst galaxies
    • 4. VSOP observation of bright GHz peaked spectrum sources
    • 5. A new sample of faint compact steep-spectrum radio sources
    • 6. Neutral gas: HI associated radio 21 cm absorption
    • 7. Distant radio galaxies
    • 8. Star forming galaxies at $\boldsymbol{z \sim 2.2}$
    • 9. General lens models
  • 7. Clusters of galaxies and large scale structure
    • 1. The distribution and kinematics of various types of galaxies in clusters
    • 2. The merger fraction in clusters of galaxies as a function of z
    • 3. The Fundamental plane for early type galaxies in a cluster at z = 0.33
    • 4. Mass determination with weak lensing
    • 5. Thick gravitational lenses
    • 6. Radio galaxies as tracers of distant galaxies
    • 7. Emission line regions in cooling flow galaxies
  • 8. Molecular astrophysics
    • 1. Detection of interstellar H ₂D +
    • 2. Tracing the evolution of deeply embedded massive young stars
    • 3. Hot CH 3OH: probing ice evaporation
    • 4. Gas-phase molecules toward massive protostars
    • 5. Water absorption toward Orion
    • 6. Detection of H 2 emission from the GG Tau circumbinary disk
    • 7. Submillimeter lines from circumstellar disks
    • 8. Two-dimensional axisymmetric PDR models
    • 9. The diffuse interstellar bands and large molecules
    • 10. Organic molecules in the star-forming regions, comets and meteorites
  • 9. Raymond & Beverly Sackler Laboratory
    • 1. Ice segregation toward high-mass star-forming regions
    • 2. The unidentified 6.8 $\boldsymbol{\mu}$m feature: ammonium bicarbonates?
    • 3. Why is the 3.4 $\boldsymbol{\mu}$m feature weak in dense clouds?
    • 4. Processing of organic residues
    • 5. Probing surface chemistry: the SURface Reaction Simulation Device
    • 6. Extraterrestrial amino acids in the Orgueil meteorite: a cometary origin?
  • 10. Instrumentation, surveys and databases
    • 1. VLTI
    • 2. HIPPARCOS and GAIA
    • 3. SAURON
    • 4. SETI
• 3. Education, popularization and social events
  • 1. Educational matters
    • 1. Organization
    • 2. Student counseling
    • 3. The ``Bologna Declaration''
    • 4. Different options for the 5th year
  • 2. Degrees awarded in 1999
    • 1. Master's degrees (``doctoraal diploma's'')
    • 2. Ph.D. Degrees
  • 3. Courses and teaching activities
    • 1. Regular courses taught by the observatory staff
    • 2. Astronomy Kaleidoscope
    • 3. Leiden-Dwingeloo summer school in astrophysics
  • 4. Popularization and media contacts
  • 5. The ``Leidsch Astronomisch Dispuut `F. Kaiser' ''
    • 1. ``Studentenlezingen''
    • 2. Tours old observatory
    • 3. ``Studententhee''
• 4. Observatory staff on December 31, 1999
• 5. Committee membership
• 6. Science policy functions
• 7. Visiting scientists
• 8. Colloquia and lectures
  • 1. Endowed lectures
  • 2. Scientific colloquia
  • 3. Student colloquia
  • 4. Workshops
    • 1. TMR Workshop on Hydrodynamical Aspects of Galaxy Formation
    • 2. Oort Workshop 1999
    • 3. Radiative Transfer in Molecular Lines
    • 4. FIRST-HIFI Workshop
    • 5. Symposium on Highlights of Laboratory Astrophysics: Tracing the Nature of Dust from Molecular Clouds to Comets
    • 6. Interferometry Workshop
    • 7. Visit Prof. C.H. Townes
• 9. Participation in scientific meetings
• 10. Observing sessions abroad
• 11. Working visits abroad
• 12. Colloquia given outside Leiden
• 13. Scientific publications
  • 1. Ph.D. theses, books and catalogues
  • 2. Papers in refereed journals
  • 3. Review articles, conference papers, etc.
  • 4. Popular articles
  • 5. Multimedia and electronic publishing
  • 6. Awards
• 14. Phone-, room numbers and e-mail addresses
• 15. Acknowledgements