Interstellar and nebular lines toward the 30 Doradus central object

Details Interstellar and nebular lines toward the 30 Doradus central object Interstellar and nebular lines toward the 30 Doradus central object

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235l.101w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 235, Jan. 15, 1980, p. L101-L103.

Other

28

Astronomical Spectroscopy, Interstellar Matter, Line Spectra, Magellanic Clouds, Nebulae, Absorption Spectra, Calcium, Radial Velocity, Sodium, Spectral Line Width

Scientific paper

Echelle spectrograms with a resolution of 0.15 A have been obtained of the central object in the 30 Doradus nebula. The Na I and Ca II interstellar absorption lines have five distinct velocity components, one formed in the Galaxy and the others in the LMC. In addition, the LMC absorption profiles have high-velocity wings extending blueward, and there is weak, high-velocity absorption extending redward from the galactic Ca II components. A large range in Na I/Ca II ratios is found among the LMC components. Velocities are also given for the double nebular emission lines and for the single He 3889-A nebular absorption line, which show that the more negative-velocity ionized material is in front of the central object, while the positive-velocity material is behind. There is little if any velocity correspondence between individual interstellar and nebular line components.

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