Observations of narrow diffuse interstellar bands toward stars with low reddening

Abstract

view Abstract Citations (17) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations of narrow diffuse interstellar bands toward stars with low reddening. Federman, S. R. ; Kumar, C. K. ; Vandenbout, P. A. Abstract The equivalent widths of the 5780-A, 5797-A, and 6613-A diffuse interstellar bands (DIBs) toward 22 stars with E(B-V) less than 0.1 are determined on the basis of observations obtained with a coude spectrograph and Si-photodiode array on the 2.7-m telescope at McDonald Observatory during June, November, and December, 1982. The results are presented in sample spectra, tables, and graphs and discussed in relation to the N(H2) data of Savage et al. (1977). All three bands are found to be 2-3 times stronger for the group of objects with N(H2) greater than 10 to the 18th/sq cm than for the group with smaller N(H2). Since this observation suggests a molecular origin for the DIBs, but the abundance data argue against a gas-phase molecular carrier, the DIBs are attributed to grain-surface impurity-site/molecular-complex interactions. The proximity of the DIBs to the velocity of the major atomic components is held to rule out the grain-sputtering hypothesis of Smith et al. (1977). Publication: The Astrophysical Journal Pub Date: July 1984 DOI: 10.1086/162226 Bibcode: 1984ApJ...282..485F Keywords: Abundance; Interstellar Extinction; Interstellar Matter; Molecular Clouds; Cosmic Dust; Diffuse Radiation; Hydrogen Clouds; Interstellar Chemistry; Spectral Line Width; Surface Reactions; Astrophysics full text sources ADS | data products SIMBAD (22)