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We have mapped the dark cloud L183 in the far-infrared at 100um and 200umwith the ISOPHOT photometer aboard the ISO satellite. The observations make itpossible for the first time to study the properties of the large dust grains inL183 without confusion from smaller grains. The observations show clear colourtemperature variations which are likely to be caused by changes in the emissionproperties of the dust particles. In the cloud core the far-infrared colourtemperature drops below 12K. The data allow a new determination of the cloudmass and the mass distribution. The mass within a radius of 10 arcmin from thecloud centre is 25 Msun. We have mapped the cloud in several molecular linesincluding DCO+(2-1) and H13CO+(1-0). These species are believed to be tracersof cold and dense molecular material and we detect a strong anticorrelationbetween the DCO+ emission and the dust colour temperatures. In particular, theDCO+(2-1) emission is not detected towards the maximum of the 100um emissionwhere the colour temperature rises above 15K. The H13CO+ emission follows theDCO+ distribution but CO isotopes show strong emission even towards the 100umpeak. A comparison of the DCO+ and C18O maps shows sharp variations in therelative intensities of the species. Morphologically the 200um dust emissiontraces the distribution of dense molecular material as seen e.g. in C18O lines.A comparison with dust column density shows that C18O is depleted by a factorof 1.5 in the cloud core. We present results of R- and B-band starcounts. Theextinction is much better correlated with the 200um than with the 100umemission. Based on the 200um correlation at low extinction values we deduce avalue of ~17mag for the visual extinction towards the cloud centre.Comment: to be published in A&

Far-infrared and molecular line observations of Lynds 183 – Studies of cold gas and dust