Probing the Local Bubble with Diffuse Interstellar Bands. III. The Northern hemisphere data and catalog

TL;DR

This study provides high-quality measurements of diffuse interstellar bands in the Local Bubble and nearby regions, offering detailed data on interstellar absorption features up to 200 parsecs.

Contribution

It presents a comprehensive catalog of DIB equivalent widths and interstellar parameters for 432 sightlines in the northern hemisphere, expanding the dataset of local interstellar medium observations.

Findings

Detected DIBs in all observed sightlines.

Provided detailed interstellar parameter measurements.

Enhanced understanding of local interstellar medium structure.

Abstract

We present a new high signal-to-noise (S/N) observations of the Diffuse Interstellar Bands (DIBs) in the Local Bubble and its surroundings. We observed 432 sightlines and obtain the equivalent widths of $\lambda$5780 and $\lambda$5797 \AA\ DIBs up to distance of $\sim$ 200 pc. All observations have been carried out by using Intermediate Dispersion Spectrograph (IDS) on 2.5 m Isaac Newton Telescope, during three years, to reach a minimum S/N ratio of $\sim$ 2000. All $\lambda$5780 and $\lambda$5797 absorptions are presented in this paper and the observed values of interstellar parameter; $\lambda$5780, $\lambda$5797, Na I D lines including the uncertainties are tabulated.