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Variable dust emission from Wolf-Rayet stars.

van der Hucht, K. A.; The, P. S.; Williams, P. M.

An infrared photometric survey of late type Wolf-Rayet stars shows little evidence for secular variation in mass loss or dust formation rates apart from the three known variables: WR 48a, WR 137 (HD 192641) and WR 140 (HD 193793, the prototype). In 1985, WR 140 again brightened sharply in the infrared owing to the formation of circumstellar dust. …

Presentation of the Herschel Medal to Wilson and Boggess

Lynden Bell, D.

Extinction in external galaxies.

Thompson, G. I.

It is suggested that there are only two general extinction laws, the galactic type and the linear SMC type. An attempt is made to show that the LMC extinction law is a composite of these two. The result is inconclusive due to the sensitivity of the constants of fit to the empirical data.