Probing the Local Bubble with Diffuse Interstellar Bands. I. Project overview and Southern hemisphere survey
Mandy Bailey (Keele University / LJMU), Jacco Th. van Loon (Keele, University), Amin Farhang (IPM, Iran), Atefeh Javadi (IPM, Iran), Habib G., Khosroshahi (IPM, Iran), Peter J. Sarre (Nottingham), Keith T. Smith, (Nottingham/RAS)

TL;DR
This study maps diffuse interstellar bands around the Local Bubble using high-quality spectra of 670 stars, revealing small-scale structure and the properties of DIB carriers, with implications for interstellar medium understanding.
Contribution
First comprehensive survey of DIBs in the Local Bubble region, providing a detailed catalogue and insights into the structure and composition of the interstellar medium.
Findings
DIBs are stronger within the Local Bubble and at its interface.
Small-scale structure causes variability in DIB strength among nearby stars.
The Local Bubble's wall is perforated, allowing radiation leakage.
Abstract
We have conducted a high signal-to-noise spectroscopic survey of 670 nearby early-type stars, to map Diffuse Interstellar Band (DIB) absorption in and around the Local Bubble. The project started with a Southern hemisphere survey conducted at the European Southern Observatory's New Technology Telescope and has since been extended to an all-sky survey using the Isaac Newton Telescope. In this first paper in the series, we introduce the overall project and present the results from the Southern hemisphere survey. We make available a catalogue of equivalent-width measurements of the DIBs at 5780, 5797, 5850, 6196, 6203, 6270, 6283 \& 6614 \AA, the interstellar Na\,{\sc i} D lines at 5890 \& 5896 \AA, and the stellar He\,{\sc i} line at 5876 \AA. We find that the 5780 \AA\ DIB is relatively strong throughout, as compared to the 5797 \AA\ DIB, but especially within the Local Bubble and at the…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astrophysics and Star Formation Studies · Galaxies: Formation, Evolution, Phenomena
