The problem of C7- as source of diffuse interstellar bands revisited

Details The problem of C7- as source of diffuse interstellar bands revisited The problem of C7- as source of diffuse interstellar bands revisited

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...377.1063g&link_type=abstract

Astronomy and Astrophysics, v.377, p.1063-1067 (2001)

Astronomy and Astrophysics

Astrophysics

5

Ism: Clouds, Molecules

Scientific paper

We used spectra of several bright, reddened stars, most of them likely to be obscured by individual interstellar clouds, to examine the proposition that C7- may carry several diffuse interstellar bands (DIBs) (Tulej et al. 1998). To search for the broad features of the C7- B <- X system we used low resolution, very high S/N spectra, but even in heavily reddened objects the predicted bands remain undetectable. High resolution (R=80 000) spectra prove that the diffuse bands, found in close vicinity of narrow lines belonging to the A <- X system, show variable strength ratios from object to object which proves that they are not of the same origin. The paper brings thus evidence that the C7- molecule does not cause any of the detected DIBs.

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