Interstellar CA II lines in SMC stars

Details Interstellar CA II lines in SMC stars Interstellar CA II lines in SMC stars

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89.1779c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 89, Dec. 1984, p. 1779-1783.

Astronomy and Astrophysics

Astronomy

11

Calcium, Early Stars, Interstellar Matter, Interstellar Radiation, Line Spectra, Magellanic Clouds, Astronomical Spectroscopy, Interstellar Extinction, Iue, Metallicity, Radial Velocity, Satellite Observation, Stellar Spectra, Ultraviolet Absorption

Scientific paper

Interstellar Ca II lines of reddened early-type stars in the SMC were observed. In addition to the component from the Milky Way, strong lines were detected at radial velocities corresponding to gas in the SMC. The interstellar Ca II lines are abnormally strong, given the small color excess of the stars and the low metallicity of the SMC gas, which suggests that the grains contain a much smaller fraction of the interstellar calcium than they do in our galaxy. The radial velocities do not conflict with the two-galaxy model for the SMC of Matthewson and Ford (1983) if the higher-velocity system is behind the lower-velocity system.

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