Grupo de Sistemas Estelares

J. Maíz Apellániz, A. Sota, R. H. Barbá, N. I. Morrell, A. Pellerin, E. J. Alfaro, S. Simón-Díaz
The Diffuse Interstellar Bands, Proceedings of the International Astronomical Union, IAU Symposium, Volume 297, pp. 117-120 (2014).
02/2014

ABSTRACT

We are using five different surveys to compile the largest sample of diffuse interstellar band (DIB) measurements ever collected. GOSSS is obtaining intermediate-resolution blue-violet spectroscopy of ~2500 OB stars, of which 60% have already been observed and processed. The other four surveys have already collected multi-epoch high-resolution optical spectroscopy of 700 OB stars with different telescopes, including the 9 m Hobby-Eberly Telescope in McDonald Observatory. Some of our stars are highly-extinguished targets for which no good-quality optical spectra have ever been published. For all of the targets in our sample we have obtained accurate spectral types, measured non-DIB ISM lines, and compiled information from the literature to calculate the extinction. Here we present the first results of the project, the properties of twenty DIBs in the 4100-5500 {\AA} range. We clearly detect a couple of previously elusive DIBs at 4170 {\AA} and 4591 {\AA}; the latter could have coronene and ovalene cations as carriers.