Skip to main content

11 Result(s)

within Christoffel Waelkens Remove this filter

and

  1. No Access

    Reference Work Entry In depth

    Pannekoek, Antonie

    Christoffel Waelkens in Biographical Encyclopedia of Astronomers (2014)

  2. No Access

    Reference Work Entry In depth

    Pannekoek, Antonie

    Christoffel Waelkens in The Biographical Encyclopedia of Astronomers (2007)

  3. No Access

    Chapter

    Post-AGB Stars

    The final phase of the evolution of low- and intermediate-mass stars is characterized by rapid changes in the structure and properties of the star and its circumstellar envelope (CSE); see Chapter 2. While it ...

    Christoffel Waelkens, Rens B. F. M. Waters in Asymptotic Giant Branch Stars (2004)

  4. No Access

    Chapter

    The ESO Observing Programmes Committee

    The Observing Programme Committee (OPC) of the European Southern Observatory (ESO) is the body which evaluates the proposals and recommends to the Director General which programmes are scientifically most valu...

    Jacques Breysacher, Christoffel Waelkens in Organizations and Strategies in Astronomy (2001)

  5. No Access

    Chapter

    The formation of stars and protoplanetary disks

    The discovery that stars and galaxies evolve, and with them the Universe, is probably the major legacy of twentieth-century astronomy. On the threshold of the new millennium, questions about the origins of the...

    Christoffel Waelkens in The Century of Space Science (2001)

  6. No Access

    Chapter and Conference Paper

    The Link between Barium Stars and Optically Bright Post-AGB Binaries

    Systematic radial velocity monitoring programs revealed that all optically bright, high-latitude post-AGB stars that show a near-IR excess in their energy distribution are binaries (see the contribution of R. ...

    Hans Van Winckel, Christoffel Waelkens, Alain Jorissen, Sophie Van Eck… in Planetary Nebulae (1997)

  7. No Access

    Chapter and Conference Paper

    Geometry of Post-AGB Shells

    Post-AGB stars are low- and intermediate-mass objects in the rapid evolutionary stage between the asymptotic giant branch (AGB) and the planetary-nebula stage. Their study is important both because it concerns...

    Christoffel Waelkens, Rens Waters, Hans Van Winckel in Science with the VLT Interferometer (1997)

  8. No Access

    Chapter and Conference Paper

    Conference Summary

    The title of this workshop, The Role of Dust in the Formation of Stars, is extremely ambitious. I realized that when I tried to anticipate beforehand what would be the main topics to address in this summary. List...

    Christoffel Waelkens in The Role of Dust in the Formation of Stars (1996)

  9. No Access

    Article

    Binarity of the red-rectangle and other extremely fe-poor (post?)-AGB stars

    We present radial velocity measurements proving the binary nature of all the known extremely Fe-deficient Post-ABG stars including HD 44179, the central star of the well known but poorly understood Red-Rectang...

    Hans Van Winckel, Christoffel Waelkens in Astrophysics and Space Science (1995)

  10. No Access

    Chapter and Conference Paper

    Binarity of the Red-Rectangle and Other Extremely Fe-Poor (Post?)-AGB Stars.

    We present radial velocity measurements proving the binary nature of all the known extremely Fe-deficient Post-ABG stars including HD 44179, the central star of the well known but poorly understood Red-Rectang...

    Hans Van Winckel, Christoffel Waelkens in Circumstellar Matter 1994 (1995)

  11. No Access

    Chapter

    Hot Pulsating Stars in the Geneva System

    We report on our observations of pulsating B stars in the Geneva Photometric System since 1980, emphasizing the importance of long-term monitoring for such objects. A recent theoretical breakthrough has now fi...

    Christoffel Waelkens in The Impact of Long-Term Monitoring on Variable Star Research (1994)