The interstellar 2200 A band : a second catalogue of equivalent widths and preliminary staistical analysis.

Abstract

A second catalogue of equivalent widths of the interstellar 2200-A band is presented. It is based on spectrophotometric data obtained with the TD-I satellite and supplements the catalogue of Guertler et al. (1982). Both catalogues list a total of 779 stars. The reliability of the derived parameters is analyzed. There is a satisfying agreement with spectrophotometric data obtained with the OAO-2 satellite. The relationship between the equivalent width of the 2200-A band and the color excess is discussed, making use of additional data for more strongly reddened stars obtained with OAO-2 and IUE.