Search Results - (Author, Cooperation:L. B. Waters)

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  1. 1
    Staff View
    Publication Date:
    2012-10-06
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] Sulphur is depleted in cold dense molecular clouds with embedded young stellar objects, indicating that most of it probably resides in solid grains. Iron sulphide grains are the main sulphur species in cometary dust particles, but there has been no direct evidence for FeS in astronomical ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/417148a

    Articles: DFG German National Licenses
  3. 3
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] Active galactic nuclei (AGNs) display many energetic phenomena—broad emission lines, X-rays, relativistic jets, radio lobes—originating from matter falling onto a supermassive black hole. It is widely accepted that orientation effects play a major role in explaining the ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/nature02531

    Articles: DFG German National Licenses
  4. 4
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] The enigmatic object η Carinae is believed to represent an important, but short-lived, unstable phase in the life of the most massive stars, occurring shortly before they explode as supernovae or collapse directly to black holes. The putative binary system believed to constitute η ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/990048

    Articles: DFG German National Licenses
  5. 5
    Jäger, C. ; Waters, L. B. F. M. ; Henning, Th. ; Molster, F. J. ; Barlow, M. J. ; Lim, T. ; de Koter, A. ; Kemper, F.

    [s.l.] : Macmillian Magazines Ltd.
    Published 2002
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] Carbonates on large Solar System bodies like Earth and Mars (the latter represented by the meteorite ALH84001) form through the weathering of silicates in a watery (CO3)2- solution. The presence of carbonates in interplanetary dust particles and asteroids (again, ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/415295a

    Articles: DFG German National Licenses
  6. 6
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] The Red Rectangle is the prototype of a class of carbon-rich reflection nebulae surrounding low-mass stars in the final stages of evolution. The central star of this nebula has ejected most of its layers (during the red-giant phase), which now form the surrounding cloud, and is rapidly evolving ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/36052

    Articles: DFG German National Licenses
  7. 7
    Staff View
    ISSN:
    1572-946X
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1001158901391

    Articles: DFG German National Licenses
  8. 8
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] Silicate dust in the interstellar medium is observed to be amorphous, yet silicate dust in comets and interplanetary dust particles is sometimes partially crystalline. The dust in disks that are thought to be forming planets around some young stars also appears to be partially crystalline. ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/44085

    Articles: DFG German National Licenses
  9. 9
    Waelkens, C. ; Waters, L. B. F. M. ; Winckel, H. ; Daems, K.
    Springer
    Published 1995
    Staff View
    ISSN:
    1572-946X
    Keywords:
    Post-AGB stars ; circumstellar matter ; HR 4049 ; HD 213985
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract The evolved C-rich low-mass stars HR 4049 and HD 213985 present variable circumstellar extinction and emission. Observations of HR 4049 strengthen the link between the far-UV extinction rise and the presence of small C-rich particles. Variability of the UV absorption bump in HD 213985 is reported here for the first time and is discussed.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00667871

    Articles: DFG German National Licenses
  10. 10
    Staff View
    ISSN:
    1572-946X
    Keywords:
    HIRAS ; carbon stars ; dust shells ; thermal pulses
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract We have examined forty-two carbon stars which show excess emission at 60 and/or 100µm by applying maximum-entropy image reconstruction techniques to the IRAS 60µm survey data. Thirteen stars are found to be extended in the reconstructed images. Four of them show a detached ring centered on the stellar position. In particular, U Ant may have a double detached dust shell. The implications of our results are discussed concerning the variation of mass loss on the AGB evolution.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00667922

    Articles: DFG German National Licenses
  11. 11
    Staff View
    ISSN:
    1572-946X
    Keywords:
    molecules ; physical conditions in AGB remnant ; mass-loss history on AGB
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract We present a list of post-AGB stars showing molecular line absorption and emission in the optical spectrum. Two objects show CH+, one in emission and one in absorption, and 10 stars show C2 and CN in absorption. The Doppler velocities of the C2 lines and the rotational temperatures indicate that the line forming region is the AGB remnant. An analysis of the post-AGB stars of which CO millimeter data is available suggests that the C2 expansion velocity is of the same order as the CO expansion velocity. HD 56126 has been studied in detail and we find a mass-loss rate of M=2.8 × 10−4 M⊙yr−1, $$f_{C_2 } $$ = 2.4 × 10−8 and f CN = 1.3 × 10−8. The mass-loss derived from C2 is significantly larger than M=1.2 × 10−5 M⊙yr−1 derived from CO. We find that all objects with the 21µm feature in emission show C2 and CN absorption, but not all objects with C2 and CN detections show a 21µm feature.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00667868

    Articles: DFG German National Licenses
  12. 12
    Staff View
    ISSN:
    1572-946X
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract We have applied maximum entropy reconstruction methods to the IRAS observations of the nova GK Persei to examine the spatial distribution of the far-IR emission. We have discovered discrete regions of emission in a co-linear structure extending to 17 arcmin on either side of the binary system, supporting a stellar origin for the structure. We postulate that the evolved secondary is the progenitor of the circumbinary envelope.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00667900

    Articles: DFG German National Licenses
  13. 13
    Waters, L. B. F. M.
    Springer
    Published 1992
    Staff View
    ISSN:
    1572-9672
    Keywords:
    Infrared radiation — stars: circumstellar material
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract In this review the IR emission from circumstellar material is discussed, both of ionized gas and dust grains, and the astrophysical information that can be extracted from such observations. Some emphasis is placed on the possibilities of stellar IR astronomy using a large space-borne telescope, especially with respect to the much better spatial and spectral resolution of such a telescope compared to the current generation of ground-based and space IR telescopes.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00212473

    Articles: DFG German National Licenses
  14. 14
    Staff View
    ISSN:
    1572-9672
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00196125

    Articles: DFG German National Licenses