The interstellar spectrum toward SN 1987A

Details The interstellar spectrum toward SN 1987A The interstellar spectrum toward SN 1987A

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...177l..17v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 177, no. 1-2, May 1987, p. L17-L20. Research supported by the European Souther

Astronomy and Astrophysics

Astrophysics

65

Absorption Spectra, Astronomical Spectroscopy, Interstellar Gas, Supernova 1987A, Calcium, Lithium, Magellanic Clouds, Potassium, Sodium

Scientific paper

The supernova 1987A offers a unique opportunity to investigate the visible interstellar absorption spectrum toward the Large Magellanic Cloud at high resolution and high signal to noise ratio. The authors report in this letter the first results of these observations. A Ca II "forest" is detected through all the velocity range between the Galaxy and the LMC and, in particular, a component is seen at a velocity of ≡215 km s-1 which may correspond to cooler gas in the halo. According to the Na I/Ca II ratio, the galactic (and LMC) gas is clearly different from the "halo" one at intermediate velocities. For the first time, neutral lithium, calcium and potassium are detected in an extragalactic interstellar medium. Six diffuse interstellar bands are also seen in both the Galaxy and the LMC.

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