Properties of Diffuse Interstellar Bands at Different Physical Conditions of the ISM
J. Kos,T. Zwitter +1 more
TLDR
In this article, a small survey of 19 DIBs' properties in 50 sightlines towards hot stars, distributed at a variety of galactic coordinates and interstellar reddening, is presented.Abstract:
Diffuse interstellar bands (DIBs) can trace different conditions of the ISM along the sightline toward the observed stars. A small survey was made in optical wavelengths, producing high resolution and high signal to noise spectra. We present measurements of 19 DIBs' properties in 50 sightlines towards hot stars, distributed at a variety of galactic coordinates and interstellar reddening. Equivalent widths were obtained by fitting asymmetric Gaussian and variable continuum to DIBs. Conditions of the ISM were calculated from 8 atomic and molecular interstellar lines. Two distinctively different types of DIBs were identified, by carefully comparing correlation coefficients between DIBs and reddening and by different behaviour in UV shielded ($\zeta$) and non-shielded ($\sigma$) sightlines. A ratio of DIBs at 5780 \AA\ and~5797 \AA\ proved to be reliable enough to distinguish between two different sightline types. Based on linear relations between DIB equivalent width and reddening for $\sigma$ and $\zeta$ sightlines, we divide DIBs into type {\sc i} (where both linear relations are similar) and type {\sc ii} (where they are significantly different). Linear relation for $\zeta$ type sightlines always show a higher slope and larger x-intercept parameter than the relation for $\sigma$ sightlines. Scatter around the linear relation is reduced after the separation, but it does not vanish completely. This means that UV shielding is the dominant factor of the DIB equivalent width vs.\ reddening relation shape for $\zeta$ sightlines, but in $\sigma$ sightlines other physical parameters play a major role. No similar dependency on gas density, electron density or turbulence was observed. A catalog of all observed interstellar lines is made public.read more
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The GALAH Survey: Second Data Release
Sven Buder,Sven Buder,Martin Asplund,Ly Duong,Janez Kos,Karin Lind,Karin Lind,Melissa Ness,Melissa Ness,Sanjib Sharma,Joss Bland-Hawthorn,Joss Bland-Hawthorn,Andrew R. Casey,Gayandhi M. De Silva,Gayandhi M. De Silva,Valentina D'Orazi,Kenneth C. Freeman,Geraint F. Lewis,Jane Lin,Sarah L. Martell,Katharine J. Schlesinger,Jeffrey D. Simpson,Daniel B. Zucker,Daniel B. Zucker,Tomaž Zwitter,Anish M. Amarsi,Borja Anguiano,Daniela Carollo,Luca Casagrande,Klemen Čotar,P. L. Cottrell,P. L. Cottrell,Gary S. Da Costa,Xudong D. Gao,Michael R. Hayden,Jonathan Horner,Michael J. Ireland,Prajwal R. Kafle,Ulisse Munari,David M. Nataf,Thomas Nordlander,Dennis Stello,Dennis Stello,Yuan-Sen Ting,Yuan-Sen Ting,Yuan-Sen Ting,Gregor Traven,Fred Watson,Fred Watson,Robert A. Wittenmyer,Rosemary F. G. Wyse,David Yong,Joel C. Zinn,Maruša Žerjal +53 more
TL;DR: In this paper, the authors present the GALAH second public data release (GALAH DR2) containing 342 682 stars and use the physics-driven spectrum synthesis of Spectroscopy Made Easy (SME) to derive stellar labels.
Journal ArticleDOI
Studies of the Diffuse Interstellar Bands. III. HD 183143
L. M. Hobbs,Donald G. York,Julie A. Thorburn,Julie A. Thorburn,Theodore P. Snow,Michael Bishof,Scott D. Friedman,Benjamin J. McCall,Takeshi Oka,Brian L. Rachford,Paule Sonnentrucker,Daniel E. Welty +11 more
TL;DR: In this article, a catalog of 414 diffuse interstellar bands (DIBs) measured between 3900 and 8100 A in the Echelle spectra of HD 183143 [B7Iae, E(B-V) = 1.27] were obtained on three nights, at a resolving power R = 38,000 and with a signal-to-noise ratio ~1000 at 6400 A.
Journal ArticleDOI
Interstellar extinction curve variations towards the inner Milky Way: a challenge to observational cosmology
David M. Nataf,David M. Nataf,Oscar A. Gonzalez,Luca Casagrande,Luca Casagrande,Gail Zasowski,Gail Zasowski,Christopher Wegg,Christian Wolf,Andrea Kunder,Javier Alonso-García,Javier Alonso-García,Dante Minniti,Marina Rejkuba,R. K. Saito,Elena Valenti,Manuela Zoccali,Manuela Zoccali,Radosław Poleski,Radosław Poleski,Grzegorz Pietrzyński,Grzegorz Pietrzyński,Jan Skowron,Igor Soszyński,Michał K. Szymański,Andrzej Udalski,Krzysztof Ulaczyk,Krzysztof Ulaczyk,Łukasz Wyrzykowski +28 more
TL;DR: In this article, the authors investigate the extinction curve variations toward the inner Milky Way in the OGLE-III and VVV surveys, with supporting evidence from diffuse interstellar bands and $F435W,F625W$ photometry.
Journal ArticleDOI
Mapping the interstellar medium with near-infrared diffuse interstellar bands
Gail Zasowski,Brice Ménard,Brice Ménard,Brice Ménard,Dmitry Bizyaev,Dmitry Bizyaev,D. A. García-Hernández,D. A. García-Hernández,A. E. García Pérez,Michael R. Hayden,Jon A. Holtzman,J. A. Johnson,Karen Kinemuchi,S. R. Majewski,David L. Nidever,Matthew Shetrone,J. C. Wilson +16 more
TL;DR: In this article, the authors present a projected map of the DIB absorption field in the Galactic plane, using a set of about 60,000 sightlines that reach up to 15 kpc from the Sun and probe up to 30 mag of visual extinction.
Journal ArticleDOI
Exploring the diffuse interstellar bands with the Sloan Digital Sky Survey
TL;DR: In this article, the distribution of diffuse interstellar bands (DIBs) induced by the Milky Way is mapped using star, galaxy and quasar spectra taken by the Sloan Digital Sky Survey.
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