A New Puzzle Regarding the Diffuse Interstellar Bands

Details A New Puzzle Regarding the Diffuse Interstellar Bands A New Puzzle Regarding the Diffuse Interstellar Bands

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasp..108...92u&link_type=abstract

Publications of the Astronomical Society of the Pacific, v.108, p.92

Astronomy and Astrophysics

Astronomy

Scientific paper

In the case of 5 O stars out of 14, the average difference between the line-of-sight velocity component shown by the diffuse interstellar bands (DIBs) and that shown by the interstellar Na I lines exceeds the range +- 10 km s ^-1. For 9 O stars this difference lies in the range +- 6 km s^-1. What does this mean? Because the typical standard deviation of v_DIB from three DIBs is 3.8 +- 1.2 km s^-1 while that of v_NaI from two interstellar lines is 1.8 +- 1.3 km s^-1, the larger values of v_DIB - v_NaI are meaningful. They imply that the grains or molecules carrying the DIBs move with the interstellar Na atoms along the lines of sight to only some O stars. (SECTION: Interstellar Medium and Nebulae)

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