Gas-to-dust ratios in the Magellanic Clouds
Abstract
Observations of about thirty MC supergiants with IUE have yielded estimates of neutral hydrogen column densities from measurements of the Lyman α absorption profile in the ultraviolet spectra which were also used to study the wavelength dependence of the extinction due to the intervening dust. The extinction laws are strongly anomalous in both of the MCs. It now appears certain that the gas-to-dust ratios in the MCs are significantly larger than those in our Galaxy. If expressed by the parameter NH/EB-V, the LMC ratio is approximately four times larger than the galactic value, whereas the SMC value is about seventeen times the galactic ratio.
- Publication:
-
Structure and Evolution of the Magellanic Clouds
- Pub Date:
- September 1984
- DOI:
- 10.1017/S0074180900040468
- Bibcode:
- 1984IAUS..108..333K
- Keywords:
-
- Abundance;
- Cosmic Dust;
- Gas Composition;
- Iue;
- Magellanic Clouds;
- Hydrogen Atoms;
- Lyman Spectra;
- Radio Astronomy;
- Ratios;
- Astrophysics