Other
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.329..606m&link_type=abstract
Nature (ISSN 0028-0836), vol. 329, Oct. 15, 1987, p. 606, 607.
Other
20
Astronomical Spectroscopy, Calcium, Interstellar Matter, Magellanic Clouds, Supernova 1987A, High Resolution, Ionization Potentials, Signal To Noise Ratios
Scientific paper
High-resolution and high SNR spectra of interstellar calcium towards SN1987A in the LMC are presented. They provide completely new results for the Ca I spectrum, in which 11 components are detected, not only at velocities corresponding to the Galaxy and the LMC, but also at intermediate velocities. The spectra, which allow the ionization balance in these interstellar clouds to be estimated, provide some clues about their physical state and location. In particular, the components between 150 and 200 km/s show a much lower ionization degree than other components. This may be due to recent compressions of the gas by a shock, possibly associated with a former supernova explosion. This interpretation would require the corresponding clouds to be located inside the LMC, indicating that at least some intermediate velocity components are not of halo origin.
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