Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...113l..15l&link_type=abstract
Astronomy and Astrophysics, vol. 113, no. 2. Sept. 1982, p. L15-L17.
Astronomy and Astrophysics
Astronomy
34
B Stars, Interstellar Extinction, Interstellar Matter, Magellanic Clouds, Ultraviolet Astronomy, Astronomical Photometry, Cosmic Dust, Early Stars, Iue, Supergiant Stars, Ultraviolet Spectra
Scientific paper
The ultraviolet extinction curve (1200-3000 A) deduced from IUE observations of the Small Magellanic Cloud star Sk 143 is presented. This curve is rather similar to the galactic one, with a large bump at 2200 A and a smaller rise shortward of 2000 A compared to the SMC extinction curve of Rocca-Volmerange et al. (1981). The N(H)/E(B-V) ratio estimated in two different ways has a value of 6 x 10 to the 21st per sq cm mag, quite comparable to the average galactic ratio, and ten times smaller than a preliminary SMC gas-to-dust ratio. Tentative explanations of the observed properties are given, including a possible binarity of Sk 143, the presence of a large amount of molecular hydrogen on the line of sight, and the existence of dust having the same properties as galactic dust.
Lequeux James
Maurice Eric
Prevot L.
Prevot-Burnichon M. L.
Rocca-Volmerange Brigitte
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