Vogrinčič, RokKos, JanezZwitter, TTraven, GregorL Beeson, KevinCotar, K.Munari, UBuder, SvenL Martell, SarahLewis, Geraint FrancisDe Silva, Gayandhi2025-01-092025-01-090035-8711https://hdl.handle.net/1885/733731551We use more than 872 000 mid- to high-resolution (R ∼ 20 000) spectra of stars from the GALactic Archaeology with HERMES (GALAH) survey to discern the spectra of diffuse interstellar bands (DIBs). We use four windows with the wavelength ranges 4718–4903, 5649–5873, 6481–6739, and 7590–7890 Å, giving a total coverage of 967 Å. We produce ∼400 000 spectra of interstellar medium (ISM) absorption features and correct them for radial velocities of the DIB clouds. Ultimately, we combine the 33 115 best ISM spectra into six reddening bins with a range of 0.1 < E(B − V) < 0.7 mag. A total of 183 absorption features in these spectra qualify as DIBs, and their fitted model parameters are summarized in a detailed catalogue. From these, 64 are not reported in the literature, of which 17 are certain, 14 are probable and 33 are possible. We find that the broad DIBs can be fitted with a multitude of narrower DIBs. Finally, we create a synthetic DIB spectrum at unit reddening. This should allow us to narrow down the possible carriers of DIBs, to explore the composition of the ISM, and ultimately to model dust and star formation better as well as to correct Galactic and extragalactic observations. The majority of certain DIBs show a significant excess of equivalent width when compared with reddening. We explain this with observed lines of sight penetrating more uniform DIB clouds compared with clumpy dust clouds.This work made use of the Third Data Release of the GALAH survey (Buder et al. 2021). The GALAH survey is based on data acquired through the Australian Astronomical Observatory, under programs: A/2013B/13 (GALAH pilot survey); A/2014A/25, A/2015A/19, A2017A/18 (GALAH survey, Phase 1); A2018A/18 (Open clusters with HERMES); A2019A/1 (Hierarchical star formation in Ori OB1); A2019A/15 (GALAH survey, Phase 2); A/2015B/19, A/2016A/22, A/2016B/10, A/2017B/16, A/2018B/15 (HERMES– TESS programme); and A/2015A/3, A/2015B/1, A/2015B/19, A/2016A/22, A/2016B/12, A/2017A/14 (HERMES K2-follow-up programme)application/pdfen-AU© 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.http://creativecommons.org/licenses/by/4.0/methods: data analysiscataloguessurveysdustextinction202310.1093/mnras/stad6782024-01-14Creative Commons Attribution 4.0 International License