Science with the Galactic O-Star Spectroscopic Survey (GOSSS): the relationship between DIBs, the ISM, and extinction

PENADÉS ORDAZ, M.; MAÍZ APELLÁNIZ, J.; SOTA, A.; ALFARO, E.; WALBORN, N.; BARBÁ, R.; MORRELL, N. I.; ARIAS, J.; GAMEN, R. C.

Madrid

Encuentro; IX Scientific Meeting of the Spanish Astronomical Society (SEA); 2010

Spanish Astronomical Society

In this poster we show our preliminary analysis of DIBs (Diffuse Interstellar Bands) and other interstellar absorption lines with the purpose of understanding their origin and their relationship with extinction. We use the biggest Galactic O-star blue-violet spectroscopic sample ever (GOSSS, see Maíz Apellániz, these proceedings). This sample allows a new insight on this topic because of the adequacy of O-star spectra, the sample number (700 by early 2010 and increasing; 400 are used here), and their distribution in the Milky Way disk. We confirm the high correlation coefficients between different DIBs and E(B-V), though the detailed behavior of each case shows small differences. We also detect a moderately low correlation coefficient between CaII lambda 3934 (Ca K) and E(B-V) with a peculiar spatial distribution that we ascribe to the relationship between line saturation and velocity profiles for CaII lambda 3934.