Astrophysical: Cosmochemistry

  • Publication
    An upper limit to the abundance of Be-9 in the Population II star HD 76932 from a high resolution spectrum with IUE

    A high resolution spectrum (Δλ = 0.2 Å) of the Population II star HD 76932 from the archive of the IUE satellite has been analysed in a search for measurable...

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    Be-9 abundances in halo dwarfs - Implications for early nucleosynthesis of light elements

    Not Available

  • Publication
    Chemical abundances of the WR-ring nebulae NGC 2359 and RCW 78

    This paper reports on extensive spectroscopic observations of the WR-ring nebulae NGC 2359 and RCW 78, respectively, excited by the WN5 stars HD 56925 and WN8...

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    Cosmochemistry. The melting pot of the elements

    The chemical composition of the Universe has evolved over billions of years. A host of astrophysical processes and observations must be understood in order to...

  • Publication
    Evolutionary phenomena in galaxies

    Topics discussed include the origin and early development of galaxies; gas and global star formation; galactic nuclei; population, age, and dynamics of the...

  • Publication
    J = 4-3 HCN observations of M17 SW, DR 21/OH/, W51 and NGC 6334

    We report observations of NGC 6334N, Ml7 5W, W 51 and DR2l(OH) in the J = 4→3 transition of HCN at 354GHz. These results are combined with previously obtained J...

  • Publication
    Limits on the D:H ratio in the interstellar medium from molecular observations

    The abundance ratio of D:H in the interstellar medium can be derived either more directly from the UV absorption measurements of HD and H2 in the spectra of...

  • Publication
    Measurement of D/H and <SUP>13</SUP>C/<SUP>12</SUP>C ratios in methane ice on Eris and Makemake: Evidence for internal activity

    James Webb Space Telescope's NIRSpec infrared imaging spectrometer observed the outer solar system dwarf planets Eris and Makemake in reflected sunlight at...

  • Publication
    The chemical composition gradient across M 33

    The abundance gradient in M 33 is studied on the basis of IPCS and CCD data on emission lines in selected H II regions, using O II, O III, S II, and S III in...