NTT interstellar NA I observations of the two faint (V is approximately equal to 15.5) optical companions of SN 1987A

Details NTT interstellar NA I observations of the two faint (V is approximately equal to 15.5) optical companions of SN 1987A NTT interstellar NA I observations of the two faint (V is approximately equal to 15.5) optical companions of SN 1987A

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247l...5d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 1, July 1991, p. L5-L8.

Astronomy and Astrophysics

Astrophysics

5

Companion Stars, Intergalactic Media, Interstellar Matter, Sodium, Stellar Spectra, Supernova 1987A, Faint Objects, Magellanic Clouds

Scientific paper

High-resolution spectra are presented of the two faint companion stars of the SN 1987A in the region of the Na I interstellar lines. Both stars exhibit absorption components at about 280 km/s, confirming their LMC membership. The corresponding Na I column density towards Star 2 is about 9 x 10 to the 11th/sq cm, a factor of 3 lower than that towards SN 1987A. From a comparison with the Na I absorption observed in nearby supergiants, it is inferred that the different column density is due to a larger depth of SN 1987A in the LMC, rather than to large density or temperature fluctuations on a subarcsec scale in the gas of the clouds. From the increase in the observed column densities between Star 2 and SN 1987A, a separation not less than 10 pc is deduced, and it is argued that it is unlikely that Star 2 has contributed to make the gas in the inner region around the supernova complex. The Star 2 spectrum does not show the 216-km/s component which is prominent in the Na I interstellar spectrum of SN 1987A.

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