Diffuse interstellar bands in RAVE survey spectra
| Autor: | U. Munari, L. Tomasella, M. Fiorucci, O. Bienaymé, J. Binney, J. Bland-Hawthorn, C. Boeche, R. Campbell, K. C. Freeman, B. Gibson, G. Gilmore, E. K. Grebel, A. Helmi, J. F. Navarro, Q. A. Parker, G. M. Seabroke, A. Siebert, A. Siviero, M. Steinmetz, F. G. Watson, M. Williams, R. F. G. Wyse, T. Zwitter |
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| Přispěvatelé: | University of Groningen |
| Rok vydání: | 2008 |
| Předmět: |
FULLERENES
DATA RELEASE FOS: Physical sciences LINES Astrophysics Spectral line POLYCYCLIC AROMATIC-HYDROCARBONS surveys ISM : general ANGSTROM VELOCITY EXPERIMENT RAVE Line (formation) Physics SPECTROSCOPY Diffuse interstellar band Wavelength range Astrophysics (astro-ph) Astronomy and Astrophysics CARRIERS Galaxy Interstellar medium AO-0235+164 Stars Wavelength Space and Planetary Science ISM : lines and bands SYSTEM |
| Zdroj: | Astronomy & astrophysics, 488(3), 969-U61. EDP Sciences |
| ISSN: | 1432-0746 0004-6361 |
| DOI: | 10.1051/0004-6361:200810232 |
| Popis: | We have used spectra of hot stars from the RAVE Survey in order to investigate the visibility and properties of five diffuse interstellar bands previously reported in the literature. The RAVE spectroscopic survey for Galactic structure and kinematics records CCD spectra covering the 8400-8800 Ang wavelength region at 7500 resolving power. The spectra are obtained with the UK Schmidt at the AAO, equipped with the 6dF multi-fiber positioner. The DIB at 8620.4 Ang is by far the strongest and cleanest of all DIBs occurring within the RAVE wavelength range, with no interference by underlying absorption stellar lines in hot stars. It correlates so tightly with reddening that it turns out to be a reliable tool to measure it, following the relation E(B-V) = 2.72 (+/- 0.03) x E.W.(Ang), valid throughout the general interstellar medium of our Galaxy. The presence of a DIB at 8648 Ang is confirmed. Its intensity appears unrelated to reddening, in agreement with scanty and preliminary reports available in the literature, and its measurability is strongly compromised by severe blending with underlying stellar HeI doublet at 8649 Ang. The two weak DIBS at 8531 and 8572 Ang do not appear real and should actually be blends of underlying stellar lines. The very weak DIB at 8439 Ang cannot be resolved within the profile of the much stronger underlying hydrogen Paschen 18 stellar line. Accepted in press by A&A |
| Databáze: | OpenAIRE |
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