A Catalog of Diffuse Interstellar Bands in the Spectrum of HD 204827

By L. Hobbs, D. York, T. Snow, T. Oka, J. Thorburn, M. Bishof, S. Friedman, B. McCall, B. Rachford, P. Sonnentrucker and 1 more. 2008

220 citations recorded by the source corpus.

Echelle spectra of the double-lined spectroscopic binary HD 204827 were obtained on five nights, at a resolving power R = 38,000 and with a S/N = 750 near 6000 Å in the final, combined spectrum. The stars show E(B − V) = 1.11 and spectral types near O9.5 V and B0.5 III. A catalog is presented of 380 diffuse interstellar bands (DIBs) measured between 3900 and 8100 Å in the stars’ spectrum. The central wavelengths, the widths (FWHM), and the equivalent widths of nearly all of the bands are tabulated, along with the minimum uncertainties in the latter. The reliable removal of very weak stellar lines from the catalog, and of some stellar lines from the less severe blends with DIBs, is made generally easy by the highly variable radial velocities of both stars. The principal result of this investigation is that the great majority of the bands in the catalog are very weak and relatively narrow. Typical equivalent widths amount to a few mÅ, and the bandwidths (FWHM) are most often near 0.55 Å. Therefore, most of these DIBs can be detected only in spectra obtained at a resolving power and a S/N at least comparable to those used here. In addition, the anomalous interstellar reddening and the very high value of the ratio N(C2)/E(B − V) seen toward HD 204827 indicate that the physical conditions in one or more of the several interstellar clouds seen in this direction differ significantly from those found toward the prototypical DIB target HD 183143, for example. Probably primarily for these reasons, 113 of the 380 bands (30%) were not detected in four previous modern surveys of the DIBs seen in the spectra of stars other than HD 204827. No preferred wavenumber spacings among the 380 bands are reliably identified which could provide clues to the identities of the large molecules thought to cause the DIBs.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/b3cc801535e3eaf743bd125efe37b2bcbfe0d463

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. W. Freedman
2. A. Gal-yam
3. S. E. Persson
4. R. Foley
5. C. Burns
6. M. Phillips
7. C. Contreras
8. B. Madore

In Instrumentation

1. C. Burns
2. S. E. Persson
3. W. Freedman
4. R. Foley
5. B. Madore
6. A. Gal-yam
7. D. Leonard
8. A. Karakas

Citations in the corpus

• ON THE SOURCE OF THE DUST EXTINCTION IN TYPE Ia SUPERNOVAE AND THE DISCOVERY OF ANOMALOUSLY STRONG Na i ABSORPTION (2013, methodology): “The rest wavelength of the 5780 Å DIB is also not very accurately known, with the uncertainty corresponding to 10–15 km s−1 in radial velocity (e.g., Galazutdinov et al. 2000; Tuairisg et al. 2000; Hobbs et al. 2008, 2009).”
• STUDIES OF DIFFUSE INTERSTELLAR BANDS V. PAIRWISE CORRELATIONS OF EIGHT STRONG DIBs AND NEUTRAL HYDROGEN, MOLECULAR HYDROGEN, AND COLOR EXCESS (2010, methodology): “Hobbs et al. 2008, 2009 (Papers II and III) present spectral atlases of DIBs toward the spectroscopic binary star HD 204827 and toward HD 183143.”
• STUDIES OF THE DIFFUSE INTERSTELLAR BANDS. III. HD 183143 (2009, unknown): “In Paper II (Hobbs et al. 2008), a detailed account was given of the entire set of 380 DIBs found at 3900 Å < λ < 8100 Å along the light path to HD 204827.”