Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...318l..28e&link_type=abstract
Astronomy and Astrophysics, v.318, p.L28-L31
Astronomy and Astrophysics
Astrophysics
17
Ism: Molecules, Ism: Dust, Extinction, Stars: Individual: Bd+63 1964, Hd 183143, Line: Profiles
Scientific paper
We report the discovery of a remarkable target concerning the Diffuse Interstellar Bands (DIBs), namely BD+63 1964. The unusual high DIB strengths in this object allow to confirm DIBs that were so far denoted only as "probable", because of their intrinsic weakness in most lines-of-sight. Due to specific line-of-sight conditions, the high reddening and the early spectral type of the star, this object is proposed as a new reference star for DIB measurements. We compared the spectrum of BD+63 1964 to the spectrum of the well studied star HD 183143. Line-of-sight parameters such a far UV extinction and Ca I abundance indicate a denser environment towards BD+63 1964, which can shield molecules efficiently from far W radiation above 6eV. The relative enhancement of narrow DIBs in BD+63 1964 versus HD 183143 is then discussed in the context of neutral fullerene compounds or large PAHs. The relative weakening of broad DIBs indicate carriers with higher photo-ionization potential and different recombination properties.
Cami Jan
Dartois Emmanuel
Ehrenfreund Pascale
Foing Bernard H.
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